RFC 2819

Network Working Group S.
Waldbusser
Request for Comments: 2819 Lucent Technologies
STD: 59 May 2000
Obsoletes: 1757
Category: Standards Track
Remote Network Monitoring Management Information Base
Status of this Memo
This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This memo defines a portion of the Management Information Base (MIB)

for use with network management protocols in TCP/IP-based internets.
In particular, it defines objects for managing remote network
monitoring devices.
This memo obsoletes RFC 1757. This memo extends that specification by
documenting the RMON MIB in SMIv2 format while remaining semantically
identical to the existing SMIv1-based MIB.
Waldbusser Standards Track [Page 1]

RFC 2819 Remote Network Monitoring MIB May 2000
Table of Contents
1 The SNMP Management Framework .............................. 2

2 Overview ................................................... 3
2.1 Remote Network Management Goals .......................... 4
2.2 Textual Conventions ...................................... 5
2.3 Structure of MIB ......................................... 5
2.3.1 The Ethernet Statistics Group .......................... 6
2.3.2 The History Control Group .............................. 6
2.3.3 The Ethernet History Group ............................. 6
2.3.4 The Alarm Group ........................................ 7
2.3.5 The Host Group ......................................... 7
2.3.6 The HostTopN Group ..................................... 7
2.3.7 The Matrix Group ....................................... 7
2.3.8 The Filter Group ....................................... 7
2.3.9 The Packet Capture Group ............................... 8
2.3.10 The Event Group ....................................... 8
3 Control of Remote Network Monitoring Devices ............... 8
3.1 Resource Sharing Among Multiple Management Stations ... 9
3.2 Row Addition Among Multiple Management Stations .......... 10
4 Conventions ................................................ 11
5 Definitions ................................................ 12
6 Security Considerations .................................... 94
7 Acknowledgments ............................................ 95
8 Author's Address ........................................... 95
9 References ................................................. 95
10 Intellectual Property ..................................... 97
11 Full Copyright Statement .................................. 98
1. The SNMP Management Framework
The SNMP Management Framework presently consists of five major

components:
o An overall architecture, described in RFC 2571 [1].
o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and described in STD
16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The
second version, called SMIv2, is described in STD 58, RFC 2578
[5], RFC 2579 [6] and RFC 2580 [7].
o Message protocols for transferring management information. The

first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [8]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC

1906 [10]. The third version of the message protocol is called

SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574
[12].
o Protocol operations for accessing management information. The

first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [8]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[13].
o A set of fundamental applications described in RFC 2573 [14] and

the view-based access control mechanism described in RFC 2575
[15].
A more detailed introduction to the current SNMP Management Framework

can be found in RFC 2570 [22].
Managed objects are accessed via a virtual information store, termed

the Management Information Base or MIB. Objects in the MIB are
defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A

MIB conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because no
translation is possible (use of Counter64). Some machine readable
information in SMIv2 will be converted into textual descriptions in
SMIv1 during the translation process. However, this loss of machine
readable information is not considered to change the semantics of the
MIB.
2. Overview
Remote network monitoring devices, often called monitors or probes,

are instruments that exist for the purpose of managing a network.
Often these remote probes are stand-alone devices and devote
significant internal resources for the sole purpose of managing a
network. An organization may employ many of these devices, one per
network segment, to manage its internet. In addition, these devices
may be used for a network management service provider to access a
client network, often geographically remote.
The objects defined in this document are intended as an interface

between an RMON agent and an RMON management application and are not
intended for direct manipulation by humans. While some users may
tolerate the direct display of some of these objects, few will

tolerate the complexity of manually manipulating objects to

accomplish row creation. These functions should be handled by the
management application.
While most of the objects in this document are suitable for the
management of any type of network, there are some which are specific
to managing Ethernet networks. These are the objects in the
etherStatsTable, the etherHistoryTable, and some attributes of the
filterPktStatus and capturBufferPacketStatus objects. The design of
this MIB allows similar objects to be defined for other network
types. It is intended that future versions of this document and
additional documents will define extensions for other network types.
There are a number of companion documents to the RMON MIB. The Token
Ring RMON MIB [19] provides objects specific to managing Token Ring
networks. The RMON-2 MIB [20] extends RMON by providing RMON analysis
up to the application layer. The SMON MIB [21] extends RMON by
providing RMON analysis for switched networks.
2.1. Remote Network Management Goals
o Offline Operation
There are sometimes conditions when a management station will
not be in constant contact with its remote monitoring devices.
This is sometimes by design in an attempt to lower
communications costs (especially when communicating over a WAN
or dialup link), or by accident as network failures affect the
communications between the management station and the probe.
For this reason, this MIB allows a probe to be configured to

perform diagnostics and to collect statistics continuously, even
when communication with the management station may not be
possible or efficient. The probe may then attempt to notify the
management station when an exceptional condition occurs. Thus,
even in circumstances where communication between management
station and probe is not continuous, fault, performance, and
configuration information may be continuously accumulated and
communicated to the management station conveniently and
efficiently.
o Proactive Monitoring
Given the resources available on the monitor, it is potentially
helpful for it continuously to run diagnostics and to log
network performance. The monitor is always available at the
onset of any failure. It can notify the management station of
the failure and can store historical statistical information

about the failure. This historical information can be played

back by the management station in an attempt to perform further
diagnosis into the cause of the problem.
o Problem Detection and Reporting

The monitor can be configured to recognize conditions, most
notably error conditions, and continuously to check for them.
When one of these conditions occurs, the event may be logged,
and management stations may be notified in a number of ways.
o Value Added Data

Because a remote monitoring device represents a network resource
dedicated exclusively to network management functions, and
because it is located directly on the monitored portion of the
network, the remote network monitoring device has the
opportunity to add significant value to the data it collects.
For instance, by highlighting those hosts on the network that
generate the most traffic or errors, the probe can give the
management station precisely the information it needs to solve a
class of problems.
o Multiple Managers
An organization may have multiple management stations for
different units of the organization, for different functions
(e.g. engineering and operations), and in an attempt to provide
disaster recovery. Because environments with multiple
management stations are common, the remote network monitoring
device has to deal with more than own management station,
potentially using its resources concurrently.
2.2. Textual Conventions
Two new data types are introduced as a textual convention in this MIB
document, OwnerString and EntryStatus.
2.3. Structure of MIB
The objects are arranged into the following groups:
- ethernet statistics
- history control
- ethernet history
- alarm
- host

- hostTopN
- matrix
- filter
- packet capture
- event
These groups are the basic unit of conformance. If a remote

monitoring device implements a group, then it must implement all
objects in that group. For example, a managed agent that implements
the host group must implement the hostControlTable, the hostTable and
the hostTimeTable. While this section provides an overview of
grouping and conformance information for this MIB, the authoritative
reference for such information is contained in the MODULE-COMPLIANCE
and OBJECT-GROUP macros later in this MIB.
All groups in this MIB are optional. Implementations of this MIB

must also implement the system group of MIB-II [16] and the IF-MIB
[17]. MIB-II may also mandate the implementation of additional
groups.
These groups are defined to provide a means of assigning object

identifiers, and to provide a method for implementors of managed
agents to know which objects they must implement.
2.3.1. The Ethernet Statistics Group
The ethernet statistics group contains statistics measured by the

probe for each monitored Ethernet interface on this device. This
group consists of the etherStatsTable.
2.3.2. The History Control Group
The history control group controls the periodic statistical sampling

of data from various types of networks. This group consists of the
historyControlTable.
2.3.3. The Ethernet History Group
The ethernet history group records periodic statistical samples from

an ethernet network and stores them for later retrieval. This group
consists of the etherHistoryTable.

2.3.4. The Alarm Group
The alarm group periodically takes statistical samples from variables

in the probe and compares them to previously configured thresholds.
If the monitored variable crosses a threshold, an event is generated.
A hysteresis mechanism is implemented to limit the generation of

alarms. This group consists of the alarmTable and requires the
implementation of the event group.
2.3.5. The Host Group
The host group contains statistics associated with each host

discovered on the network. This group discovers hosts on the network
by keeping a list of source and destination MAC Addresses seen in
good packets promiscuously received from the network. This group
consists of the hostControlTable, the hostTable, and the
hostTimeTable.
2.3.6. The HostTopN Group
The hostTopN group is used to prepare reports that describe the hosts
that top a list ordered by one of their statistics. The available
statistics are samples of one of their base statistics over an
interval specified by the management station. Thus, these statistics
are rate based. The management station also selects how many such
hosts are reported. This group consists of the hostTopNControlTable
and the hostTopNTable, and requires the implementation of the host
group.
2.3.7. The Matrix Group
The matrix group stores statistics for conversations between sets of

two addresses. As the device detects a new conversation, it creates
a new entry in its tables. This group consists of the
matrixControlTable, the matrixSDTable and the matrixDSTable.
2.3.8. The Filter Group
The filter group allows packets to be matched by a filter equation.

These matched packets form a data stream that may be captured or may
generate events. This group consists of the filterTable and the
channelTable.

2.3.9. The Packet Capture Group
The Packet Capture group allows packets to be captured after they

flow through a channel. This group consists of the
bufferControlTable and the captureBufferTable, and requires the
implementation of the filter group.
2.3.10. The Event Group
The event group controls the generation and notification of events

from this device. This group consists of the eventTable and the
logTable.
3. Control of Remote Network Monitoring Devices
Due to the complex nature of the available functions in these

devices, the functions often need user configuration. In many cases,
the function requires parameters to be set up for a data collection
operation. The operation can proceed only after these parameters are
fully set up.
Many functional groups in this MIB have one or more tables in which
to set up control parameters, and one or more data tables in which to
place the results of the operation. The control tables are typically
read-write in nature, while the data tables are typically read-only.
Because the parameters in the control table often describe resulting
data in the data table, many of the parameters can be modified only
when the control entry is invalid. Thus, the method for modifying
these parameters is to invalidate the control entry, causing its
deletion and the deletion of any associated data entries, and then
create a new control entry with the proper parameters. Deleting the
control entry also gives a convenient method for reclaiming the
resources used by the associated data.
Some objects in this MIB provide a mechanism to execute an action on

the remote monitoring device. These objects may execute an action as
a result of a change in the state of the object. For those objects
in this MIB, a request to set an object to the same value as it
currently holds would thus cause no action to occur.
To facilitate control by multiple managers, resources have to be

shared among the managers. These resources are typically the memory
and computation resources that a function requires.

3.1. Resource Sharing Among Multiple Management Stations
When multiple management stations wish to use functions that compete

for a finite amount of resources on a device, a method to facilitate
this sharing of resources is required. Potential conflicts include:
o Two management stations wish to simultaneously use resources

that together would exceed the capability of the device.
o A management station uses a significant amount of resources for
a long period of time.
o A management station uses resources and then crashes,
forgetting to free the resources so others may use them.
A mechanism is provided for each management station initiated

function in this MIB to avoid these conflicts and to help resolve
them when they occur. Each function has a label identifying the
initiator (owner) of the function. This label is set by the
initiator to provide for the following possibilities:
o A management station may recognize resources it owns and no

longer needs.
o A network operator can find the management station that owns
the resource and negotiate for it to be freed.
o A network operator may decide to unilaterally free resources
another network operator has reserved.
o Upon initialization, a management station may recognize
resources it had reserved in the past. With this information
it may free the resources if it no longer needs them.
Management stations and probes should support any format of the owner
string dictated by the local policy of the organization. It is
suggested that this name contain one or more of the following: IP
address, management station name, network manager's name, location,
or phone number. This information will help users to share the
resources more effectively.
There is often default functionality that the device or the

administrator of the probe (often the network administrator) wishes
to set up. The resources associated with this functionality are then
owned by the device itself or by the network administrator, and are
intended to be long-lived. In this case, the device or the
administrator will set the relevant owner object to a string starting
with 'monitor'. Indiscriminate modification of the monitor-owned
configuration by network management stations is discouraged. In
fact, a network management station should only modify these objects
under the direction of the administrator of the probe.

Resources on a probe are scarce and are typically allocated when

control rows are created by an application. Since many applications
may be using a probe simultaneously, indiscriminate allocation of
resources to particular applications is very likely to cause resource
shortages in the probe.
When a network management station wishes to utilize a function in a

monitor, it is encouraged to first scan the control table of that
function to find an instance with similar parameters to share. This
is especially true for those instances owned by the monitor, which
can be assumed to change infrequently. If a management station
decides to share an instance owned by another management station, it
should understand that the management station that owns the instance
may indiscriminately modify or delete it.
It should be noted that a management application should have the most

trust in a monitor-owned row because it should be changed very
infrequently. A row owned by the management application is less
long-lived because a network administrator is more likely to re-
assign resources from a row that is in use by one user than from a
monitor-owned row that is potentially in use by many users. A row
owned by another application would be even less long-lived because
the other application may delete or modify that row completely at its
discretion.
3.2. Row Addition Among Multiple Management Stations
The addition of new rows is achieved using the method described in

RFC 1905 [13]. In this MIB, rows are often added to a table in order
to configure a function. This configuration usually involves
parameters that control the operation of the function. The agent
must check these parameters to make sure they are appropriate given
restrictions defined in this MIB as well as any implementation
specific restrictions such as lack of resources. The agent
implementor may be confused as to when to check these parameters and
when to signal to the management station that the parameters are
invalid. There are two opportunities:
o When the management station sets each parameter object.
o When the management station sets the entry status object to

valid.
If the latter is chosen, it would be unclear to the management

station which of the several parameters was invalid and caused the
badValue error to be emitted. Thus, wherever possible, the
implementor should choose the former as it will provide more
information to the management station.

A problem can arise when multiple management stations attempt to set

configuration information simultaneously using SNMP. When this
involves the addition of a new conceptual row in the same control
table, the managers may collide, attempting to create the same entry.
To guard against these collisions, each such control entry contains a
status object with special semantics that help to arbitrate among the
managers. If an attempt is made with the row addition mechanism to
create such a status object and that object already exists, an error
is returned. When more than one manager simultaneously attempts to
create the same conceptual row, only the first can succeed. The
others will receive an error.
When a manager wishes to create a new control entry, it needs to

choose an index for that row. It may choose this index in a variety
of ways, hopefully minimizing the chances that the index is in use by
another manager. If the index is in use, the mechanism mentioned
previously will guard against collisions. Examples of schemes to
choose index values include random selection or scanning the control
table looking for the first unused index. Because index values may
be any valid value in the range and they are chosen by the manager,
the agent must allow a row to be created with any unused index value
if it has the resources to create a new row.
Some tables in this MIB reference other tables within this MIB. When
creating or deleting entries in these tables, it is generally
allowable for dangling references to exist. There is no defined
order for creating or deleting entries in these tables.
4. Conventions
The following conventions are used throughout the RMON MIB and its
companion documents.
Good Packets
Good packets are error-free packets that have a valid frame length.
For example, on Ethernet, good packets are error-free packets that
are between 64 octets long and 1518 octets long. They follow the
form defined in IEEE 802.3 section 3.2.all.
Bad Packets
Bad packets are packets that have proper framing and are therefore
recognized as packets, but contain errors within the packet or have
an invalid length. For example, on Ethernet, bad packets have a
valid preamble and SFD, but have a bad CRC, or are either shorter
than 64 octets or longer than 1518 octets.

5. Definitions
RMON-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
NOTIFICATION-TYPE, mib-2, Counter32,
Integer32, TimeTicks FROM SNMPv2-SMI
TEXTUAL-CONVENTION, DisplayString FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP FROM SNMPv2-CONF;
-- Remote Network Monitoring MIB
rmonMibModule MODULE-IDENTITY
LAST-UPDATED "200005110000Z" -- 11 May, 2000
ORGANIZATION "IETF RMON MIB Working Group"
CONTACT-INFO
"Steve Waldbusser
Phone: +1-650-948-6500
Fax: +1-650-745-0671
Email: waldbusser@nextbeacon.com"
DESCRIPTION
"Remote network monitoring devices, often called
monitors or probes, are instruments that exist for
the purpose of managing a network. This MIB defines
objects for managing remote network monitoring devices."
REVISION "200005110000Z" -- 11 May, 2000

DESCRIPTION
"Reformatted into SMIv2 format.
This version published as RFC 2819."
REVISION "199502010000Z" -- 1 Feb, 1995

DESCRIPTION
"Bug fixes, clarifications and minor changes based on
implementation experience, published as RFC1757 [18].
Two changes were made to object definitions:
1) A new status bit has been defined for the

captureBufferPacketStatus object, indicating that the
packet order within the capture buffer may not be identical to
the packet order as received off the wire. This bit may only

be used for packets transmitted by the probe. Older NMS

applications can safely ignore this status bit, which might be
used by newer agents.
2) The packetMatch trap has been removed. This trap was never
actually 'approved' and was not added to this document along
with the risingAlarm and fallingAlarm traps. The packetMatch
trap could not be throttled, which could cause disruption of
normal network traffic under some circumstances. An NMS should
configure a risingAlarm threshold on the appropriate
channelMatches instance if a trap is desired for a packetMatch
event. Note that logging of packetMatch events is still
supported--only trap generation for such events has been
removed.
In addition, several clarifications to individual object

definitions have been added to assist agent and NMS
implementors:
- global definition of 'good packets' and 'bad packets'
- more detailed text governing conceptual row creation and

modification
- instructions for probes relating to interface changes and

disruptions
- clarification of some ethernet counter definitions
- recommended formula for calculating network utilization
- clarification of channel and captureBuffer behavior for some

unusual conditions
- examples of proper instance naming for each table"
REVISION "199111010000Z" -- 1 Nov, 1991

DESCRIPTION
"The original version of this MIB, published as RFC1271."
::= { rmonConformance 8 }
rmon OBJECT IDENTIFIER ::= { mib-2 16 }
-- textual conventions
OwnerString ::= TEXTUAL-CONVENTION

STATUS current

DESCRIPTION
"This data type is used to model an administratively
assigned name of the owner of a resource. Implementations
must accept values composed of well-formed NVT ASCII
sequences. In addition, implementations should accept
values composed of well-formed UTF-8 sequences.
It is suggested that this name contain one or more of

the following: IP address, management station name,
network manager's name, location, or phone number.
In some cases the agent itself will be the owner of
an entry. In these cases, this string shall be set
to a string starting with 'monitor'.
SNMP access control is articulated entirely in terms

of the contents of MIB views; access to a particular
SNMP object instance depends only upon its presence
or absence in a particular MIB view and never upon
its value or the value of related object instances.
Thus, objects of this type afford resolution of
resource contention only among cooperating
managers; they realize no access control function
with respect to uncooperative parties."
SYNTAX OCTET STRING (SIZE (0..127))
EntryStatus ::= TEXTUAL-CONVENTION

STATUS current
DESCRIPTION
"The status of a table entry.
Setting this object to the value invalid(4) has the

effect of invalidating the corresponding entry.
That is, it effectively disassociates the mapping
identified with said entry.
It is an implementation-specific matter as to whether
the agent removes an invalidated entry from the table.
Accordingly, management stations must be prepared to
receive tabular information from agents that corresponds
to entries currently not in use. Proper
interpretation of such entries requires examination
of the relevant EntryStatus object.
An existing instance of this object cannot be set to

createRequest(2). This object may only be set to
createRequest(2) when this instance is created. When
this object is created, the agent may wish to create
supplemental object instances with default values
to complete a conceptual row in this table. Because the

creation of these default objects is entirely at the option

of the agent, the manager must not assume that any will be
created, but may make use of any that are created.
Immediately after completing the create operation, the agent
must set this object to underCreation(3).
When in the underCreation(3) state, an entry is allowed to

exist in a possibly incomplete, possibly inconsistent state,
usually to allow it to be modified in multiple PDUs. When in
this state, an entry is not fully active.
Entries shall exist in the underCreation(3) state until
the management station is finished configuring the entry
and sets this object to valid(1) or aborts, setting this
object to invalid(4). If the agent determines that an
entry has been in the underCreation(3) state for an
abnormally long time, it may decide that the management
station has crashed. If the agent makes this decision,
it may set this object to invalid(4) to reclaim the
entry. A prudent agent will understand that the
management station may need to wait for human input
and will allow for that possibility in its
determination of this abnormally long period.
An entry in the valid(1) state is fully configured and

consistent and fully represents the configuration or
operation such a row is intended to represent. For
example, it could be a statistical function that is
configured and active, or a filter that is available
in the list of filters processed by the packet capture
process.
A manager is restricted to changing the state of an entry in

the following ways:
To: valid createRequest underCreation invalid

From:
valid OK NO OK OK
createRequest N/A N/A N/A N/A
underCreation OK NO OK OK
invalid NO NO NO OK
nonExistent NO OK NO OK
In the table above, it is not applicable to move the state

from the createRequest state to any other state because the
manager will never find the variable in that state. The
nonExistent state is not a value of the enumeration, rather
it means that the entryStatus variable does not exist at all.

An agent may allow an entryStatus variable to change state in

additional ways, so long as the semantics of the states are
followed. This allowance is made to ease the implementation of
the agent and is made despite the fact that managers should
never exercise these additional state transitions."
SYNTAX INTEGER {
valid(1),
createRequest(2),
underCreation(3),
invalid(4)
}
statistics OBJECT IDENTIFIER ::= { rmon 1 }

history OBJECT IDENTIFIER ::= { rmon 2 }
alarm OBJECT IDENTIFIER ::= { rmon 3 }
hosts OBJECT IDENTIFIER ::= { rmon 4 }
hostTopN OBJECT IDENTIFIER ::= { rmon 5 }
matrix OBJECT IDENTIFIER ::= { rmon 6 }
filter OBJECT IDENTIFIER ::= { rmon 7 }
capture OBJECT IDENTIFIER ::= { rmon 8 }
event OBJECT IDENTIFIER ::= { rmon 9 }
rmonConformance OBJECT IDENTIFIER ::= { rmon 20 }
-- The Ethernet Statistics Group

--
-- Implementation of the Ethernet Statistics group is optional.
-- Consult the MODULE-COMPLIANCE macro for the authoritative
-- conformance information for this MIB.
--
-- The ethernet statistics group contains statistics measured by the
-- probe for each monitored interface on this device. These
-- statistics take the form of free running counters that start from
-- zero when a valid entry is created.
--
-- This group currently has statistics defined only for
-- Ethernet interfaces. Each etherStatsEntry contains statistics
-- for one Ethernet interface. The probe must create one
-- etherStats entry for each monitored Ethernet interface
-- on the device.
etherStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF EtherStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of Ethernet statistics entries."
::= { statistics 1 }

etherStatsEntry OBJECT-TYPE
SYNTAX EtherStatsEntry
STATUS current
DESCRIPTION
"A collection of statistics kept for a particular
Ethernet interface. As an example, an instance of the
etherStatsPkts object might be named etherStatsPkts.1"
INDEX { etherStatsIndex }
::= { etherStatsTable 1 }
EtherStatsEntry ::= SEQUENCE {

etherStatsIndex Integer32,
etherStatsDataSource OBJECT IDENTIFIER,
etherStatsDropEvents Counter32,
etherStatsOctets Counter32,
etherStatsPkts Counter32,
etherStatsBroadcastPkts Counter32,
etherStatsMulticastPkts Counter32,
etherStatsCRCAlignErrors Counter32,
etherStatsUndersizePkts Counter32,
etherStatsOversizePkts Counter32,
etherStatsFragments Counter32,
etherStatsJabbers Counter32,
etherStatsCollisions Counter32,
etherStatsPkts64Octets Counter32,
etherStatsPkts65to127Octets Counter32,
etherStatsOwner OwnerString,
etherStatsStatus EntryStatus
}
etherStatsIndex OBJECT-TYPE
SYNTAX Integer32 (1..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of this object uniquely identifies this
etherStats entry."
::= { etherStatsEntry 1 }
etherStatsDataSource OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current

DESCRIPTION
"This object identifies the source of the data that
this etherStats entry is configured to analyze. This
source can be any ethernet interface on this device.
In order to identify a particular interface, this object
shall identify the instance of the ifIndex object,
defined in RFC 2233 [17], for the desired interface.
For example, if an entry were to receive data from
interface #1, this object would be set to ifIndex.1.
The statistics in this group reflect all packets

on the local network segment attached to the identified
interface.
An agent may or may not be able to tell if fundamental

changes to the media of the interface have occurred and
necessitate an invalidation of this entry. For example, a
hot-pluggable ethernet card could be pulled out and replaced
by a token-ring card. In such a case, if the agent has such
knowledge of the change, it is recommended that it
invalidate this entry.
This object may not be modified if the associated

etherStatsStatus object is equal to valid(1)."
etherStatsDropEvents OBJECT-TYPE
SYNTAX Counter32
STATUS current
DESCRIPTION
"The total number of events in which packets
were dropped by the probe due to lack of resources.
Note that this number is not necessarily the number of
packets dropped; it is just the number of times this
condition has been detected."
etherStatsOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
FCS octets).

This object can be used as a reasonable estimate of

10-Megabit ethernet utilization. If greater precision is
desired, the etherStatsPkts and etherStatsOctets objects
should be sampled before and after a common interval. The
differences in the sampled values are Pkts and Octets,
respectively, and the number of seconds in the interval is
Interval. These values are used to calculate the Utilization
as follows:
Pkts * (9.6 + 6.4) + (Octets * .8)

Utilization = -------------------------------------
Interval * 10,000
The result of this equation is the value Utilization which

is the percent utilization of the ethernet segment on a
scale of 0 to 100 percent."
etherStatsPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of packets (including bad packets,
broadcast packets, and multicast packets) received."
etherStatsBroadcastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of good packets received that were
directed to the broadcast address. Note that this
does not include multicast packets."
etherStatsMulticastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of good packets received that were
directed to a multicast address. Note that this number
does not include packets directed to the broadcast

address."
etherStatsCRCAlignErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of packets received that
had a length (excluding framing bits, but
including FCS octets) of between 64 and 1518
octets, inclusive, but had either a bad
Frame Check Sequence (FCS) with an integral
number of octets (FCS Error) or a bad FCS with
a non-integral number of octets (Alignment Error)."
etherStatsUndersizePkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of packets received that were
less than 64 octets long (excluding framing bits,
but including FCS octets) and were otherwise well
formed."
etherStatsOversizePkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
longer than 1518 octets (excluding framing bits,
but including FCS octets) and were otherwise
well formed."
etherStatsFragments OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION

"The total number of packets received that were less than

64 octets in length (excluding framing bits but including
FCS octets) and had either a bad Frame Check Sequence
(FCS) with an integral number of octets (FCS Error) or a
bad FCS with a non-integral number of octets (Alignment
Error).
Note that it is entirely normal for etherStatsFragments to

increment. This is because it counts both runts (which are
normal occurrences due to collisions) and noise hits."
etherStatsJabbers OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
longer than 1518 octets (excluding framing bits,
but including FCS octets), and had either a bad
Frame Check Sequence (FCS) with an integral number
of octets (FCS Error) or a bad FCS with a non-integral
number of octets (Alignment Error).
Note that this definition of jabber is different

than the definition in IEEE-802.3 section 8.2.1.5
(10BASE5) and section 10.3.1.4 (10BASE2). These
documents define jabber as the condition where any
packet exceeds 20 ms. The allowed range to detect
jabber is between 20 ms and 150 ms."
etherStatsCollisions OBJECT-TYPE
SYNTAX Counter32
UNITS "Collisions"
STATUS current
DESCRIPTION
"The best estimate of the total number of collisions
on this Ethernet segment.
The value returned will depend on the location of the

RMON probe. Section 8.2.1.3 (10BASE-5) and section
10.3.1.3 (10BASE-2) of IEEE standard 802.3 states that a
station must detect a collision, in the receive mode, if
three or more stations are transmitting simultaneously. A
repeater port must detect a collision when two or more

stations are transmitting simultaneously. Thus a probe

placed on a repeater port could record more collisions
than a probe connected to a station on the same segment
would.
Probe location plays a much smaller role when considering

10BASE-T. 14.2.1.4 (10BASE-T) of IEEE standard 802.3
defines a collision as the simultaneous presence of signals
on the DO and RD circuits (transmitting and receiving
at the same time). A 10BASE-T station can only detect
collisions when it is transmitting. Thus probes placed on
a station and a repeater, should report the same number of
collisions.
Note also that an RMON probe inside a repeater should

ideally report collisions between the repeater and one or
more other hosts (transmit collisions as defined by IEEE
802.3k) plus receiver collisions observed on any coax
segments to which the repeater is connected."
etherStatsPkts64Octets OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of packets (including bad
packets) received that were 64 octets in length
(excluding framing bits but including FCS octets)."
etherStatsPkts65to127Octets OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
packets) received that were between
65 and 127 octets in length inclusive
SYNTAX Counter32
UNITS "Packets"

STATUS current
DESCRIPTION
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
etherStatsOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current

DESCRIPTION
"The entity that configured this entry and is therefore
using the resources assigned to it."
etherStatsStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this etherStats entry."
-- The History Control Group
-- Implementation of the History Control group is optional.

--
-- The history control group controls the periodic statistical
-- sampling of data from various types of networks. The
-- historyControlTable stores configuration entries that each
-- define an interface, polling period, and other parameters.
-- Once samples are taken, their data is stored in an entry
-- in a media-specific table. Each such entry defines one
-- sample, and is associated with the historyControlEntry that
-- caused the sample to be taken. Each counter in the
-- etherHistoryEntry counts the same event as its similarly-named
-- counterpart in the etherStatsEntry, except that each value here
-- is a cumulative sum during a sampling period.
--
-- If the probe keeps track of the time of day, it should start
-- the first sample of the history at a time such that
-- when the next hour of the day begins, a sample is
-- started at that instant. This tends to make more
-- user-friendly reports, and enables comparison of reports
-- from different probes that have relatively accurate time
-- of day.
--
-- The probe is encouraged to add two history control entries
-- per monitored interface upon initialization that describe a short
-- term and a long term polling period. Suggested parameters are 30
-- seconds for the short term polling period and 30 minutes for
-- the long term period.
historyControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HistoryControlEntry

STATUS current
DESCRIPTION
"A list of history control entries."
::= { history 1 }
historyControlEntry OBJECT-TYPE
SYNTAX HistoryControlEntry
STATUS current
DESCRIPTION
"A list of parameters that set up a periodic sampling of
statistics. As an example, an instance of the
historyControlInterval object might be named
historyControlInterval.2"
INDEX { historyControlIndex }
::= { historyControlTable 1 }
HistoryControlEntry ::= SEQUENCE {

historyControlIndex Integer32,
historyControlDataSource OBJECT IDENTIFIER,
historyControlBucketsRequested Integer32,
historyControlBucketsGranted Integer32,
historyControlInterval Integer32,
historyControlOwner OwnerString,
historyControlStatus EntryStatus
}
historyControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in the
historyControl table. Each such entry defines a
set of samples at a particular interval for an
interface on the device."
::= { historyControlEntry 1 }
historyControlDataSource OBJECT-TYPE
STATUS current
DESCRIPTION
"This object identifies the source of the data for
which historical data was collected and
placed in a media-specific table on behalf of this
historyControlEntry. This source can be any
interface on this device. In order to identify

a particular interface, this object shall identify

the instance of the ifIndex object, defined
in RFC 2233 [17], for the desired interface.

interface.


historyControlStatus object is equal to valid(1)."
historyControlBucketsRequested OBJECT-TYPE
STATUS current
DESCRIPTION
"The requested number of discrete time intervals
over which data is to be saved in the part of the
media-specific table associated with this
historyControlEntry.
When this object is created or modified, the probe

should set historyControlBucketsGranted as closely to
this object as is possible for the particular probe
implementation and available resources."
DEFVAL { 50 }
historyControlBucketsGranted OBJECT-TYPE
STATUS current
DESCRIPTION
"The number of discrete sampling intervals
over which data shall be saved in the part of
the media-specific table associated with this
historyControlEntry.

When the associated historyControlBucketsRequested

object is created or modified, the probe
should set this object as closely to the requested
value as is possible for the particular
probe implementation and available resources. The
probe must not lower this value except as a result
of a modification to the associated
historyControlBucketsRequested object.
There will be times when the actual number of

buckets associated with this entry is less than
the value of this object. In this case, at the
end of each sampling interval, a new bucket will
be added to the media-specific table.
When the number of buckets reaches the value of

this object and a new bucket is to be added to the
media-specific table, the oldest bucket associated
with this historyControlEntry shall be deleted by
the agent so that the new bucket can be added.
When the value of this object changes to a value less

than the current value, entries are deleted
from the media-specific table associated with this
historyControlEntry. Enough of the oldest of these
entries shall be deleted by the agent so that their
number remains less than or equal to the new value of
this object.
When the value of this object changes to a value greater

than the current value, the number of associated media-
specific entries may be allowed to grow."
historyControlInterval OBJECT-TYPE
UNITS "Seconds"
STATUS current
DESCRIPTION
"The interval in seconds over which the data is
sampled for each bucket in the part of the
media-specific table associated with this
historyControlEntry. This interval can
be set to any number of seconds between 1 and
3600 (1 hour).
Because the counters in a bucket may overflow at their

maximum value with no indication, a prudent manager will

take into account the possibility of overflow in any of
the associated counters. It is important to consider the
minimum time in which any counter could overflow on a
particular media type and set the historyControlInterval
object to a value less than this interval. This is
typically most important for the 'octets' counter in any
media-specific table. For example, on an Ethernet
network, the etherHistoryOctets counter could overflow
in about one hour at the Ethernet's maximum
utilization.

historyControlStatus object is equal to valid(1)."
DEFVAL { 1800 }
historyControlOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
historyControlStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this historyControl entry.
Each instance of the media-specific table associated

with this historyControlEntry will be deleted by the agent
if this historyControlEntry is not equal to valid(1)."
-- The Ethernet History Group
-- Implementation of the Ethernet History group is optional.

--
-- The Ethernet History group records periodic statistical samples
-- from a network and stores them for later retrieval.
-- Once samples are taken, their data is stored in an entry
-- in a media-specific table. Each such entry defines one

-- sample, and is associated with the historyControlEntry that

-- caused the sample to be taken. This group defines the
-- etherHistoryTable, for Ethernet networks.
--
etherHistoryTable OBJECT-TYPE
SYNTAX SEQUENCE OF EtherHistoryEntry
STATUS current
DESCRIPTION
"A list of Ethernet history entries."
::= { history 2 }
etherHistoryEntry OBJECT-TYPE
SYNTAX EtherHistoryEntry
STATUS current
DESCRIPTION
"An historical sample of Ethernet statistics on a particular
Ethernet interface. This sample is associated with the
historyControlEntry which set up the parameters for
a regular collection of these samples. As an example, an
instance of the etherHistoryPkts object might be named
etherHistoryPkts.2.89"
INDEX { etherHistoryIndex , etherHistorySampleIndex }
::= { etherHistoryTable 1 }
EtherHistoryEntry ::= SEQUENCE {

etherHistoryIndex Integer32,
etherHistorySampleIndex Integer32,
etherHistoryIntervalStart TimeTicks,
etherHistoryDropEvents Counter32,
etherHistoryOctets Counter32,
etherHistoryPkts Counter32,
etherHistoryBroadcastPkts Counter32,
etherHistoryMulticastPkts Counter32,
etherHistoryCRCAlignErrors Counter32,
etherHistoryUndersizePkts Counter32,
etherHistoryOversizePkts Counter32,
etherHistoryFragments Counter32,
etherHistoryJabbers Counter32,
etherHistoryCollisions Counter32,
etherHistoryUtilization Integer32
}
etherHistoryIndex OBJECT-TYPE

STATUS current
DESCRIPTION
"The history of which this entry is a part. The
history identified by a particular value of this
index is the same history as identified
by the same value of historyControlIndex."
::= { etherHistoryEntry 1 }
etherHistorySampleIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that uniquely identifies the particular
sample this entry represents among all samples
associated with the same historyControlEntry.
This index starts at 1 and increases by one
as each new sample is taken."
etherHistoryIntervalStart OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime at the start of the interval
over which this sample was measured. If the probe
keeps track of the time of day, it should start
the first sample of the history at a time such that
when the next hour of the day begins, a sample is
started at that instant. Note that following this
rule may require the probe to delay collecting the
first sample of the history, as each sample must be
of the same interval. Also note that the sample which
is currently being collected is not accessible in this
table until the end of its interval."
etherHistoryDropEvents OBJECT-TYPE
SYNTAX Counter32
STATUS current
DESCRIPTION
"The total number of events in which packets
were dropped by the probe due to lack of resources
during this sampling interval. Note that this number
is not necessarily the number of packets dropped, it
is just the number of times this condition has been

detected."
etherHistoryOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
FCS octets)."
etherHistoryPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets (including bad packets)
received during this sampling interval."
etherHistoryBroadcastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of good packets received during this
sampling interval that were directed to the
broadcast address."
etherHistoryMulticastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of good packets received during this
sampling interval that were directed to a
multicast address. Note that this number does not
include packets addressed to the broadcast address."

etherHistoryCRCAlignErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets received during this
sampling interval that had a length (excluding
framing bits but including FCS octets) between
64 and 1518 octets, inclusive, but had either a bad Frame
Check Sequence (FCS) with an integral number of octets
(FCS Error) or a bad FCS with a non-integral number
of octets (Alignment Error)."
etherHistoryUndersizePkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
sampling interval that were less than 64 octets
long (excluding framing bits but including FCS
octets) and were otherwise well formed."
etherHistoryOversizePkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
sampling interval that were longer than 1518
octets (excluding framing bits but including
FCS octets) but were otherwise well formed."
etherHistoryFragments OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The total number of packets received during this
sampling interval that were less than 64 octets in
length (excluding framing bits but including FCS

octets) had either a bad Frame Check Sequence (FCS)

with an integral number of octets (FCS Error) or a bad
FCS with a non-integral number of octets (Alignment
Error).
Note that it is entirely normal for etherHistoryFragments to

increment. This is because it counts both runts (which are
normal occurrences due to collisions) and noise hits."
etherHistoryJabbers OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
sampling interval that were longer than 1518 octets
(excluding framing bits but including FCS octets),
and had either a bad Frame Check Sequence (FCS)
with an integral number of octets (FCS Error) or
a bad FCS with a non-integral number of octets
(Alignment Error).
Note that this definition of jabber is different

than the definition in IEEE-802.3 section 8.2.1.5
(10BASE5) and section 10.3.1.4 (10BASE2). These
documents define jabber as the condition where any
packet exceeds 20 ms. The allowed range to detect
jabber is between 20 ms and 150 ms."
etherHistoryCollisions OBJECT-TYPE
SYNTAX Counter32
UNITS "Collisions"
STATUS current
DESCRIPTION
"The best estimate of the total number of collisions
on this Ethernet segment during this sampling
interval.
The value returned will depend on the location of the

RMON probe. Section 8.2.1.3 (10BASE-5) and section
10.3.1.3 (10BASE-2) of IEEE standard 802.3 states that a
station must detect a collision, in the receive mode, if
three or more stations are transmitting simultaneously. A
repeater port must detect a collision when two or more

stations are transmitting simultaneously. Thus a probe

placed on a repeater port could record more collisions
than a probe connected to a station on the same segment
would.
Probe location plays a much smaller role when considering

10BASE-T. 14.2.1.4 (10BASE-T) of IEEE standard 802.3
defines a collision as the simultaneous presence of signals
on the DO and RD circuits (transmitting and receiving
at the same time). A 10BASE-T station can only detect
collisions when it is transmitting. Thus probes placed on
a station and a repeater, should report the same number of
collisions.
Note also that an RMON probe inside a repeater should

ideally report collisions between the repeater and one or
more other hosts (transmit collisions as defined by IEEE
802.3k) plus receiver collisions observed on any coax
segments to which the repeater is connected."
etherHistoryUtilization OBJECT-TYPE
STATUS current
DESCRIPTION
"The best estimate of the mean physical layer
network utilization on this interface during this
sampling interval, in hundredths of a percent."
-- The Alarm Group
-- Implementation of the Alarm group is optional. The Alarm Group

-- requires the implementation of the Event group.
--
-- The Alarm group periodically takes statistical samples from
-- variables in the probe and compares them to thresholds that have
-- been configured. The alarm table stores configuration
-- entries that each define a variable, polling period, and
-- threshold parameters. If a sample is found to cross the
-- threshold values, an event is generated. Only variables that
-- resolve to an ASN.1 primitive type of INTEGER (INTEGER, Integer32,
-- Counter32, Counter64, Gauge32, or TimeTicks) may be monitored in
-- this way.
--

-- This function has a hysteresis mechanism to limit the generation

-- of events. This mechanism generates one event as a threshold
-- is crossed in the appropriate direction. No more events are
-- generated for that threshold until the opposite threshold is
-- crossed.
--
-- In the case of a sampling a deltaValue, a probe may implement
-- this mechanism with more precision if it takes a delta sample
-- twice per period, each time comparing the sum of the latest two
-- samples to the threshold. This allows the detection of threshold
-- crossings that span the sampling boundary. Note that this does
-- not require any special configuration of the threshold value.
-- It is suggested that probes implement this more precise algorithm.
alarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmEntry
STATUS current
DESCRIPTION
"A list of alarm entries."
::= { alarm 1 }
alarmEntry OBJECT-TYPE
SYNTAX AlarmEntry
STATUS current
DESCRIPTION
"A list of parameters that set up a periodic checking
for alarm conditions. For example, an instance of the
alarmValue object might be named alarmValue.8"
INDEX { alarmIndex }
::= { alarmTable 1 }
AlarmEntry ::= SEQUENCE {

alarmIndex Integer32,
alarmInterval Integer32,
alarmVariable OBJECT IDENTIFIER,
alarmSampleType INTEGER,
alarmValue Integer32,
alarmStartupAlarm INTEGER,
alarmRisingThreshold Integer32,
alarmFallingThreshold Integer32,
alarmRisingEventIndex Integer32,
alarmFallingEventIndex Integer32,
alarmOwner OwnerString,
alarmStatus EntryStatus
}

alarmIndex OBJECT-TYPE
STATUS current
DESCRIPTION
alarm table. Each such entry defines a
diagnostic sample at a particular interval
for an object on the device."
::= { alarmEntry 1 }
alarmInterval OBJECT-TYPE
SYNTAX Integer32
UNITS "Seconds"
STATUS current
DESCRIPTION
"The interval in seconds over which the data is
sampled and compared with the rising and falling
thresholds. When setting this variable, care
should be taken in the case of deltaValue
sampling - the interval should be set short enough
that the sampled variable is very unlikely to
increase or decrease by more than 2^31 - 1 during
a single sampling interval.

alarmStatus object is equal to valid(1)."
alarmVariable OBJECT-TYPE
STATUS current
DESCRIPTION
"The object identifier of the particular variable to be
sampled. Only variables that resolve to an ASN.1 primitive
type of INTEGER (INTEGER, Integer32, Counter32, Counter64,
Gauge, or TimeTicks) may be sampled.
Because SNMP access control is articulated entirely

in terms of the contents of MIB views, no access
control mechanism exists that can restrict the value of
this object to identify only those objects that exist
in a particular MIB view. Because there is thus no
acceptable means of restricting the read access that
could be obtained through the alarm mechanism, the
probe must only grant write access to this object in

those views that have read access to all objects on

the probe.
During a set operation, if the supplied variable name is

not available in the selected MIB view, a badValue error
must be returned. If at any time the variable name of
an established alarmEntry is no longer available in the
selected MIB view, the probe must change the status of
this alarmEntry to invalid(4).

alarmSampleType OBJECT-TYPE
SYNTAX INTEGER {
absoluteValue(1),
deltaValue(2)
}
STATUS current
DESCRIPTION
"The method of sampling the selected variable and
calculating the value to be compared against the
thresholds. If the value of this object is
absoluteValue(1), the value of the selected variable
will be compared directly with the thresholds at the
end of the sampling interval. If the value of this
object is deltaValue(2), the value of the selected
variable at the last sample will be subtracted from
the current value, and the difference compared with
the thresholds.

alarmValue OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The value of the statistic during the last sampling
period. For example, if the sample type is deltaValue,
this value will be the difference between the samples
at the beginning and end of the period. If the sample
type is absoluteValue, this value will be the sampled
value at the end of the period.

This is the value that is compared with the rising and

falling thresholds.
The value during the current sampling period is not

made available until the period is completed and will
remain available until the next period completes."
alarmStartupAlarm OBJECT-TYPE
SYNTAX INTEGER {
risingAlarm(1),
fallingAlarm(2),
risingOrFallingAlarm(3)
}
STATUS current
DESCRIPTION
"The alarm that may be sent when this entry is first
set to valid. If the first sample after this entry
becomes valid is greater than or equal to the
risingThreshold and alarmStartupAlarm is equal to
risingAlarm(1) or risingOrFallingAlarm(3), then a single
rising alarm will be generated. If the first sample
after this entry becomes valid is less than or equal
to the fallingThreshold and alarmStartupAlarm is equal
to fallingAlarm(2) or risingOrFallingAlarm(3), then a
single falling alarm will be generated.

alarmRisingThreshold OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"A threshold for the sampled statistic. When the current
sampled value is greater than or equal to this threshold,
and the value at the last sampling interval was less than
this threshold, a single event will be generated.
A single event will also be generated if the first
sample after this entry becomes valid is greater than or
equal to this threshold and the associated
alarmStartupAlarm is equal to risingAlarm(1) or
risingOrFallingAlarm(3).
After a rising event is generated, another such event

will not be generated until the sampled value

falls below this threshold and reaches the
alarmFallingThreshold.

alarmFallingThreshold OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"A threshold for the sampled statistic. When the current
sampled value is less than or equal to this threshold,
and the value at the last sampling interval was greater than
this threshold, a single event will be generated.
A single event will also be generated if the first
sample after this entry becomes valid is less than or
equal to this threshold and the associated
alarmStartupAlarm is equal to fallingAlarm(2) or
risingOrFallingAlarm(3).
After a falling event is generated, another such event

will not be generated until the sampled value
rises above this threshold and reaches the
alarmRisingThreshold.

alarmRisingEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The index of the eventEntry that is
used when a rising threshold is crossed. The
eventEntry identified by a particular value of
this index is the same as identified by the same value
of the eventIndex object. If there is no
corresponding entry in the eventTable, then
no association exists. In particular, if this value
is zero, no associated event will be generated, as
zero is not a valid event index.


alarmFallingEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The index of the eventEntry that is
used when a falling threshold is crossed. The
eventEntry identified by a particular value of
this index is the same as identified by the same value
of the eventIndex object. If there is no
corresponding entry in the eventTable, then
no association exists. In particular, if this value
is zero, no associated event will be generated, as
zero is not a valid event index.

alarmOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
alarmStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this alarm entry."
-- The Host Group
-- Implementation of the Host group is optional.

--
-- The host group discovers new hosts on the network by
-- keeping a list of source and destination MAC Addresses seen
-- in good packets. For each of these addresses, the host group

-- keeps a set of statistics. The hostControlTable controls

-- which interfaces this function is performed on, and contains
-- some information about the process. On behalf of each
-- hostControlEntry, data is collected on an interface and placed
-- in both the hostTable and the hostTimeTable. If the
-- monitoring device finds itself short of resources, it may
-- delete entries as needed. It is suggested that the device
-- delete the least recently used entries first.
-- The hostTable contains entries for each address discovered on

-- a particular interface. Each entry contains statistical
-- data about that host. This table is indexed by the
-- MAC address of the host, through which a random access
-- may be achieved.
-- The hostTimeTable contains data in the same format as the

-- hostTable, and must contain the same set of hosts, but is
-- indexed using hostTimeCreationOrder rather than hostAddress.
-- The hostTimeCreationOrder is an integer which reflects
-- the relative order in which a particular entry was discovered
-- and thus inserted into the table. As this order, and thus
-- the index, is among those entries currently in the table,
-- the index for a particular entry may change if an
-- (earlier) entry is deleted. Thus the association between
-- hostTimeCreationOrder and hostTimeEntry may be broken at
-- any time.
-- The hostTimeTable has two important uses. The first is the

-- fast download of this potentially large table. Because the
-- index of this table runs from 1 to the size of the table,
-- inclusive, its values are predictable. This allows very
-- efficient packing of variables into SNMP PDU's and allows
-- a table transfer to have multiple packets outstanding.
-- These benefits increase transfer rates tremendously.
-- The second use of the hostTimeTable is the efficient discovery

-- by the management station of new entries added to the table.
-- After the management station has downloaded the entire table,
-- it knows that new entries will be added immediately after the
-- end of the current table. It can thus detect new entries there
-- and retrieve them easily.
-- Because the association between hostTimeCreationOrder and

-- hostTimeEntry may be broken at any time, the management
-- station must monitor the related hostControlLastDeleteTime
-- object. When the management station thus detects a deletion,
-- it must assume that any such associations have been broken,
-- and invalidate any it has stored locally. This includes

-- restarting any download of the hostTimeTable that may have been

-- in progress, as well as rediscovering the end of the
-- hostTimeTable so that it may detect new entries. If the
-- management station does not detect the broken association,
-- it may continue to refer to a particular host by its
-- creationOrder while unwittingly retrieving the data associated
-- with another host entirely. If this happens while downloading
-- the host table, the management station may fail to download
-- all of the entries in the table.
hostControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostControlEntry
STATUS current
DESCRIPTION
"A list of host table control entries."
::= { hosts 1 }
hostControlEntry OBJECT-TYPE
SYNTAX HostControlEntry
STATUS current
DESCRIPTION
"A list of parameters that set up the discovery of hosts
on a particular interface and the collection of statistics
about these hosts. For example, an instance of the
hostControlTableSize object might be named
hostControlTableSize.1"
INDEX { hostControlIndex }
::= { hostControlTable 1 }
HostControlEntry ::= SEQUENCE {
hostControlIndex Integer32,
hostControlDataSource OBJECT IDENTIFIER,
hostControlTableSize Integer32,
hostControlLastDeleteTime TimeTicks,
hostControlOwner OwnerString,
hostControlStatus EntryStatus
}
hostControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION

hostControl table. Each such entry defines

a function that discovers hosts on a particular interface
and places statistics about them in the hostTable and
the hostTimeTable on behalf of this hostControlEntry."
::= { hostControlEntry 1 }
hostControlDataSource OBJECT-TYPE
STATUS current
DESCRIPTION
"This object identifies the source of the data for
this instance of the host function. This source
can be any interface on this device. In order
to identify a particular interface, this object shall
identify the instance of the ifIndex object, defined
in RFC 2233 [17], for the desired interface.

interface.


hostControlStatus object is equal to valid(1)."
hostControlTableSize OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The number of hostEntries in the hostTable and the
hostTimeTable associated with this hostControlEntry."
hostControlLastDeleteTime OBJECT-TYPE
SYNTAX TimeTicks

STATUS current
DESCRIPTION
"The value of sysUpTime when the last entry
was deleted from the portion of the hostTable
associated with this hostControlEntry. If no
deletions have occurred, this value shall be zero."
hostControlOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
hostControlStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this hostControl entry.
If this object is not equal to valid(1), all associated

entries in the hostTable, hostTimeTable, and the
hostTopNTable shall be deleted by the agent."
hostTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostEntry
STATUS current
DESCRIPTION
"A list of host entries."
::= { hosts 2 }
hostEntry OBJECT-TYPE
SYNTAX HostEntry
STATUS current
DESCRIPTION
"A collection of statistics for a particular host that has
been discovered on an interface of this device. For example,
an instance of the hostOutBroadcastPkts object might be
named hostOutBroadcastPkts.1.6.8.0.32.27.3.176"
INDEX { hostIndex, hostAddress }
::= { hostTable 1 }

HostEntry ::= SEQUENCE {

hostAddress OCTET STRING,
hostCreationOrder Integer32,
hostIndex Integer32,
hostInPkts Counter32,
hostOutPkts Counter32,
hostInOctets Counter32,
hostOutOctets Counter32,
hostOutErrors Counter32,
hostOutBroadcastPkts Counter32,
hostOutMulticastPkts Counter32
}
hostAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The physical address of this host."
::= { hostEntry 1 }
hostCreationOrder OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that defines the relative ordering of
the creation time of hosts captured for a
particular hostControlEntry. This index shall
be between 1 and N, where N is the value of
the associated hostControlTableSize. The ordering
of the indexes is based on the order of each entry's
insertion into the table, in which entries added earlier
have a lower index value than entries added later.
It is important to note that the order for a

particular entry may change as an (earlier) entry
is deleted from the table. Because this order may
change, management stations should make use of the
hostControlLastDeleteTime variable in the
hostControlEntry associated with the relevant
portion of the hostTable. By observing
this variable, the management station may detect
the circumstances where a previous association
between a value of hostCreationOrder
and a hostEntry may no longer hold."
::= { hostEntry 2 }

hostIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The set of collected host statistics of which
this entry is a part. The set of hosts
identified by a particular value of this
index is associated with the hostControlEntry
as identified by the same value of hostControlIndex."
::= { hostEntry 3 }
hostInPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of good packets transmitted to this
address since it was added to the hostTable."
::= { hostEntry 4 }
hostOutPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets, including bad packets, transmitted
by this address since it was added to the hostTable."
::= { hostEntry 5 }
hostInOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The number of octets transmitted to this address since
it was added to the hostTable (excluding framing
bits but including FCS octets), except for those
octets in bad packets."
::= { hostEntry 6 }
hostOutOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"

STATUS current
DESCRIPTION
"The number of octets transmitted by this address since
it was added to the hostTable (excluding framing
bits but including FCS octets), including those
::= { hostEntry 7 }
hostOutErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of bad packets transmitted by this address
since this host was added to the hostTable."
::= { hostEntry 8 }
hostOutBroadcastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of good packets transmitted by this
address that were directed to the broadcast address
since this host was added to the hostTable."
::= { hostEntry 9 }
hostOutMulticastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
address that were directed to a multicast address
since this host was added to the hostTable.
Note that this number does not include packets
directed to the broadcast address."
::= { hostEntry 10 }
-- host Time Table
hostTimeTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTimeEntry
STATUS current

DESCRIPTION
"A list of time-ordered host table entries."
::= { hosts 3 }
hostTimeEntry OBJECT-TYPE
SYNTAX HostTimeEntry
STATUS current
DESCRIPTION
"A collection of statistics for a particular host that has
been discovered on an interface of this device. This
collection includes the relative ordering of the creation
time of this object. For example, an instance of the
hostTimeOutBroadcastPkts object might be named
hostTimeOutBroadcastPkts.1.687"
INDEX { hostTimeIndex, hostTimeCreationOrder }
::= { hostTimeTable 1 }
HostTimeEntry ::= SEQUENCE {

hostTimeAddress OCTET STRING,
hostTimeCreationOrder Integer32,
hostTimeIndex Integer32,
hostTimeInPkts Counter32,
hostTimeOutPkts Counter32,
hostTimeInOctets Counter32,
hostTimeOutOctets Counter32,
hostTimeOutErrors Counter32,
hostTimeOutBroadcastPkts Counter32,
hostTimeOutMulticastPkts Counter32
}
hostTimeAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
::= { hostTimeEntry 1 }
hostTimeCreationOrder OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in
the hostTime table among those entries associated
with the same hostControlEntry. This index shall
be between 1 and N, where N is the value of

the associated hostControlTableSize. The ordering

of the indexes is based on the order of each entry's
insertion into the table, in which entries added earlier
have a lower index value than entries added later.
Thus the management station has the ability to
learn of new entries added to this table without
downloading the entire table.
It is important to note that the index for a

particular entry may change as an (earlier) entry
is deleted from the table. Because this order may
change, management stations should make use of the
hostControlLastDeleteTime variable in the
hostControlEntry associated with the relevant
portion of the hostTimeTable. By observing
this variable, the management station may detect
the circumstances where a download of the table
may have missed entries, and where a previous
association between a value of hostTimeCreationOrder
and a hostTimeEntry may no longer hold."
hostTimeIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The set of collected host statistics of which
index is associated with the hostControlEntry
as identified by the same value of hostControlIndex."
hostTimeInPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of good packets transmitted to this
address since it was added to the hostTimeTable."
hostTimeOutPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"

STATUS current
DESCRIPTION
"The number of packets, including bad packets, transmitted
by this address since it was added to the hostTimeTable."
hostTimeInOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The number of octets transmitted to this address since
it was added to the hostTimeTable (excluding framing
bits but including FCS octets), except for those
hostTimeOutOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The number of octets transmitted by this address since
it was added to the hostTimeTable (excluding framing
bits but including FCS octets), including those
hostTimeOutErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of bad packets transmitted by this address
since this host was added to the hostTimeTable."
hostTimeOutBroadcastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
address that were directed to the broadcast address

since this host was added to the hostTimeTable."

hostTimeOutMulticastPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
address that were directed to a multicast address
since this host was added to the hostTimeTable.
Note that this number does not include packets directed
to the broadcast address."
-- The Host Top "N" Group
-- Implementation of the Host Top N group is optional. The Host Top N

-- group requires the implementation of the host group.
--
-- The Host Top N group is used to prepare reports that describe
-- the hosts that top a list ordered by one of their statistics.
-- The available statistics are samples of one of their
-- base statistics, over an interval specified by the management
-- station. Thus, these statistics are rate based. The management
-- station also selects how many such hosts are reported.
-- The hostTopNControlTable is used to initiate the generation of

-- such a report. The management station may select the parameters
-- of such a report, such as which interface, which statistic,
-- how many hosts, and the start and stop times of the sampling.
-- When the report is prepared, entries are created in the
-- hostTopNTable associated with the relevant hostTopNControlEntry.
-- These entries are static for each report after it has been
-- prepared.
hostTopNControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTopNControlEntry
STATUS current
DESCRIPTION
"A list of top N host control entries."
::= { hostTopN 1 }
hostTopNControlEntry OBJECT-TYPE

SYNTAX HostTopNControlEntry
STATUS current
DESCRIPTION
"A set of parameters that control the creation of a report
of the top N hosts according to several metrics. For
example, an instance of the hostTopNDuration object might
be named hostTopNDuration.3"
INDEX { hostTopNControlIndex }
::= { hostTopNControlTable 1 }
HostTopNControlEntry ::= SEQUENCE {

hostTopNControlIndex Integer32,
hostTopNHostIndex Integer32,
hostTopNRateBase INTEGER,
hostTopNTimeRemaining Integer32,
hostTopNDuration Integer32,
hostTopNRequestedSize Integer32,
hostTopNGrantedSize Integer32,
hostTopNStartTime TimeTicks,
hostTopNOwner OwnerString,
hostTopNStatus EntryStatus
}
hostTopNControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry
in the hostTopNControl table. Each such
entry defines one top N report prepared for
one interface."
::= { hostTopNControlEntry 1 }
hostTopNHostIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The host table for which a top N report will be prepared
on behalf of this entry. The host table identified by a
particular value of this index is associated with the same
host table as identified by the same value of
hostIndex.

hostTopNStatus object is equal to valid(1)."

hostTopNRateBase OBJECT-TYPE
SYNTAX INTEGER {
hostTopNInPkts(1),
hostTopNOutPkts(2),
hostTopNInOctets(3),
hostTopNOutOctets(4),
hostTopNOutErrors(5),
hostTopNOutBroadcastPkts(6),
hostTopNOutMulticastPkts(7)
}
STATUS current
DESCRIPTION
"The variable for each host that the hostTopNRate
variable is based upon.

hostTopNStatus object is equal to valid(1)."
hostTopNTimeRemaining OBJECT-TYPE
SYNTAX Integer32
UNITS "Seconds"
STATUS current
DESCRIPTION
"The number of seconds left in the report currently being
collected. When this object is modified by the management
station, a new collection is started, possibly aborting
a currently running report. The new value is used
as the requested duration of this report, which is
loaded into the associated hostTopNDuration object.
When this object is set to a non-zero value, any

associated hostTopNEntries shall be made
inaccessible by the monitor. While the value of this
object is non-zero, it decrements by one per second until
it reaches zero. During this time, all associated
hostTopNEntries shall remain inaccessible. At the time
that this object decrements to zero, the report is made
accessible in the hostTopNTable. Thus, the hostTopN
table needs to be created only at the end of the collection
interval."
DEFVAL { 0 }

hostTopNDuration OBJECT-TYPE
SYNTAX Integer32
UNITS "Seconds"
STATUS current
DESCRIPTION
"The number of seconds that this report has collected
during the last sampling interval, or if this
report is currently being collected, the number
of seconds that this report is being collected
during this sampling interval.
When the associated hostTopNTimeRemaining object is set,

this object shall be set by the probe to the same value
and shall not be modified until the next time
the hostTopNTimeRemaining is set.
This value shall be zero if no reports have been

requested for this hostTopNControlEntry."
DEFVAL { 0 }
hostTopNRequestedSize OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The maximum number of hosts requested for the top N
table.

should set hostTopNGrantedSize as closely to this
object as is possible for the particular probe
implementation and available resources."
DEFVAL { 10 }
hostTopNGrantedSize OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The maximum number of hosts in the top N table.
When the associated hostTopNRequestedSize object is

created or modified, the probe should set this
object as closely to the requested value as is possible
for the particular implementation and available

resources. The probe must not lower this value except

as a result of a set to the associated
hostTopNRequestedSize object.
Hosts with the highest value of hostTopNRate shall be

placed in this table in decreasing order of this rate
until there is no more room or until there are no more
hosts."
hostTopNStartTime OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime when this top N report was
last started. In other words, this is the time that
the associated hostTopNTimeRemaining object was
modified to start the requested report."
hostTopNOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
hostTopNStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this hostTopNControl entry.

hostTopNEntries shall be deleted by the agent."
hostTopNTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTopNEntry
STATUS current
DESCRIPTION
"A list of top N host entries."
::= { hostTopN 2 }

hostTopNEntry OBJECT-TYPE
SYNTAX HostTopNEntry
STATUS current
DESCRIPTION
"A set of statistics for a host that is part of a top N
report. For example, an instance of the hostTopNRate
object might be named hostTopNRate.3.10"
INDEX { hostTopNReport, hostTopNIndex }
::= { hostTopNTable 1 }
HostTopNEntry ::= SEQUENCE {

hostTopNReport Integer32,
hostTopNIndex Integer32,
hostTopNAddress OCTET STRING,
hostTopNRate Integer32
}
hostTopNReport OBJECT-TYPE
STATUS current
DESCRIPTION
"This object identifies the top N report of which
object is part of the same report as identified
by the same value of the hostTopNControlIndex object."
::= { hostTopNEntry 1 }
hostTopNIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in
the hostTopN table among those in the same report.
This index is between 1 and N, where N is the
number of entries in this table. Increasing values
of hostTopNIndex shall be assigned to entries with
decreasing values of hostTopNRate until index N
is assigned to the entry with the lowest value of
hostTopNRate or there are no more hostTopNEntries."
hostTopNAddress OBJECT-TYPE
SYNTAX OCTET STRING

STATUS current
DESCRIPTION
hostTopNRate OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The amount of change in the selected variable
during this sampling interval. The selected
variable is this host's instance of the object
selected by hostTopNRateBase."
-- The Matrix Group
-- Implementation of the Matrix group is optional.

--
-- The Matrix group consists of the matrixControlTable, matrixSDTable
-- and the matrixDSTable. These tables store statistics for a
-- particular conversation between two addresses. As the device
-- detects a new conversation, including those to a non-unicast
-- address, it creates a new entry in both of the matrix tables.
-- It must only create new entries based on information
-- received in good packets. If the monitoring device finds
-- itself short of resources, it may delete entries as needed.
-- It is suggested that the device delete the least recently used
-- entries first.
matrixControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixControlEntry
STATUS current
DESCRIPTION
"A list of information entries for the
traffic matrix on each interface."
::= { matrix 1 }
matrixControlEntry OBJECT-TYPE
SYNTAX MatrixControlEntry
STATUS current
DESCRIPTION
"Information about a traffic matrix on a particular

interface. For example, an instance of the

matrixControlLastDeleteTime object might be named
matrixControlLastDeleteTime.1"
INDEX { matrixControlIndex }
::= { matrixControlTable 1 }
MatrixControlEntry ::= SEQUENCE {

matrixControlIndex Integer32,
matrixControlDataSource OBJECT IDENTIFIER,
matrixControlTableSize Integer32,
matrixControlLastDeleteTime TimeTicks,
matrixControlOwner OwnerString,
matrixControlStatus EntryStatus
}
matrixControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION
matrixControl table. Each such entry defines
a function that discovers conversations on a particular
interface and places statistics about them in the
matrixSDTable and the matrixDSTable on behalf of this
matrixControlEntry."
::= { matrixControlEntry 1 }
matrixControlDataSource OBJECT-TYPE
STATUS current
DESCRIPTION
"This object identifies the source of
the data from which this entry creates a traffic matrix.
This source can be any interface on this device. In
order to identify a particular interface, this object
shall identify the instance of the ifIndex object,
defined in RFC 2233 [17], for the desired
interface. For example, if an entry were to receive data
from interface #1, this object would be set to ifIndex.1.

interface.




matrixControlStatus object is equal to valid(1)."
matrixControlTableSize OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The number of matrixSDEntries in the matrixSDTable
for this interface. This must also be the value of
the number of entries in the matrixDSTable for this
interface."
matrixControlLastDeleteTime OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime when the last entry
was deleted from the portion of the matrixSDTable
or matrixDSTable associated with this matrixControlEntry.
If no deletions have occurred, this value shall be
zero."
matrixControlOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
matrixControlStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this matrixControl entry.


entries in the matrixSDTable and the matrixDSTable
shall be deleted by the agent."
matrixSDTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixSDEntry
STATUS current
DESCRIPTION
"A list of traffic matrix entries indexed by
source and destination MAC address."
::= { matrix 2 }
matrixSDEntry OBJECT-TYPE
SYNTAX MatrixSDEntry
STATUS current
DESCRIPTION
"A collection of statistics for communications between
two addresses on a particular interface. For example,
an instance of the matrixSDPkts object might be named
matrixSDPkts.1.6.8.0.32.27.3.176.6.8.0.32.10.8.113"
INDEX { matrixSDIndex,
matrixSDSourceAddress, matrixSDDestAddress }
::= { matrixSDTable 1 }
MatrixSDEntry ::= SEQUENCE {

matrixSDSourceAddress OCTET STRING,
matrixSDDestAddress OCTET STRING,
matrixSDIndex Integer32,
matrixSDPkts Counter32,
matrixSDOctets Counter32,
matrixSDErrors Counter32
}
matrixSDSourceAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The source physical address."
::= { matrixSDEntry 1 }
matrixSDDestAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current

DESCRIPTION
"The destination physical address."
matrixSDIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The set of collected matrix statistics of which
this entry is a part. The set of matrix statistics
identified by a particular value of this index
is associated with the same matrixControlEntry
as identified by the same value of matrixControlIndex."
matrixSDPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets transmitted from the source
address to the destination address (this number includes
bad packets)."
matrixSDOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The number of octets (excluding framing bits but
including FCS octets) contained in all packets
transmitted from the source address to the
destination address."
matrixSDErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of bad packets transmitted from
the source address to the destination address."

-- Traffic matrix tables from destination to source
matrixDSTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixDSEntry
STATUS current
DESCRIPTION
"A list of traffic matrix entries indexed by
destination and source MAC address."
::= { matrix 3 }
matrixDSEntry OBJECT-TYPE
SYNTAX MatrixDSEntry
STATUS current
DESCRIPTION
"A collection of statistics for communications between
two addresses on a particular interface. For example,
an instance of the matrixSDPkts object might be named
matrixSDPkts.1.6.8.0.32.10.8.113.6.8.0.32.27.3.176"
INDEX { matrixDSIndex,
matrixDSDestAddress, matrixDSSourceAddress }
::= { matrixDSTable 1 }
MatrixDSEntry ::= SEQUENCE {

matrixDSSourceAddress OCTET STRING,
matrixDSDestAddress OCTET STRING,
matrixDSIndex Integer32,
matrixDSPkts Counter32,
matrixDSOctets Counter32,
matrixDSErrors Counter32
}
matrixDSSourceAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The source physical address."
::= { matrixDSEntry 1 }
matrixDSDestAddress OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The destination physical address."

matrixDSIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The set of collected matrix statistics of which
this entry is a part. The set of matrix statistics
identified by a particular value of this index
is associated with the same matrixControlEntry
as identified by the same value of matrixControlIndex."
matrixDSPkts OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets transmitted from the source
address to the destination address (this number includes
bad packets)."
matrixDSOctets OBJECT-TYPE
SYNTAX Counter32
UNITS "Octets"
STATUS current
DESCRIPTION
"The number of octets (excluding framing bits
but including FCS octets) contained in all packets
transmitted from the source address to the
destination address."
matrixDSErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of bad packets transmitted from
the source address to the destination address."
-- The Filter Group
-- Implementation of the Filter group is optional.


--
-- The Filter group allows packets to be captured with an
-- arbitrary filter expression. A logical data and
-- event stream or "channel" is formed by the packets
-- that match the filter expression.
--
-- This filter mechanism allows the creation of an arbitrary
-- logical expression with which to filter packets. Each
-- filter associated with a channel is OR'ed with the others.
-- Within a filter, any bits checked in the data and status are
-- AND'ed with respect to other bits in the same filter. The
-- NotMask also allows for checking for inequality. Finally,
-- the channelAcceptType object allows for inversion of the
-- whole equation.
--
-- If a management station wishes to receive a trap to alert it
-- that new packets have been captured and are available for
-- download, it is recommended that it set up an alarm entry that
-- monitors the value of the relevant channelMatches instance.
--
-- The channel can be turned on or off, and can also
-- generate events when packets pass through it.
filterTable OBJECT-TYPE
SYNTAX SEQUENCE OF FilterEntry
STATUS current
DESCRIPTION
"A list of packet filter entries."
::= { filter 1 }
filterEntry OBJECT-TYPE
SYNTAX FilterEntry
STATUS current
DESCRIPTION
"A set of parameters for a packet filter applied on a
particular interface. As an example, an instance of the
filterPktData object might be named filterPktData.12"
INDEX { filterIndex }
::= { filterTable 1 }
FilterEntry ::= SEQUENCE {

filterIndex Integer32,
filterChannelIndex Integer32,
filterPktDataOffset Integer32,

filterPktData OCTET STRING,

filterPktDataMask OCTET STRING,
filterPktDataNotMask OCTET STRING,
filterPktStatus Integer32,
filterPktStatusMask Integer32,
filterPktStatusNotMask Integer32,
filterOwner OwnerString,
filterStatus EntryStatus
}
filterIndex OBJECT-TYPE
STATUS current
DESCRIPTION
in the filter table. Each such entry defines
one filter that is to be applied to every packet
received on an interface."
::= { filterEntry 1 }
filterChannelIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"This object identifies the channel of which this filter
is a part. The filters identified by a particular value
of this object are associated with the same channel as
identified by the same value of the channelIndex object."
filterPktDataOffset OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION
"The offset from the beginning of each packet where
a match of packet data will be attempted. This offset
is measured from the point in the physical layer
packet after the framing bits, if any. For example,
in an Ethernet frame, this point is at the beginning of
the destination MAC address.

filterStatus object is equal to valid(1)."
DEFVAL { 0 }

filterPktData OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The data that is to be matched with the input packet.
For each packet received, this filter and the accompanying
filterPktDataMask and filterPktDataNotMask will be
adjusted for the offset. The only bits relevant to this
match algorithm are those that have the corresponding
filterPktDataMask bit equal to one. The following three
rules are then applied to every packet:
(1) If the packet is too short and does not have data
corresponding to part of the filterPktData, the packet
will fail this data match.
(2) For each relevant bit from the packet with the
corresponding filterPktDataNotMask bit set to zero, if
the bit from the packet is not equal to the corresponding
bit from the filterPktData, then the packet will fail
this data match.
(3) If for every relevant bit from the packet with the
corresponding filterPktDataNotMask bit set to one, the
bit from the packet is equal to the corresponding bit
from the filterPktData, then the packet will fail this
data match.
Any packets that have not failed any of the three matches
above have passed this data match. In particular, a zero
length filter will match any packet.

filterPktDataMask OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The mask that is applied to the match process.
After adjusting this mask for the offset, only those
bits in the received packet that correspond to bits set
in this mask are relevant for further processing by the

match algorithm. The offset is applied to filterPktDataMask

in the same way it is applied to the filter. For the
purposes of the matching algorithm, if the associated
filterPktData object is longer than this mask, this mask is
conceptually extended with '1' bits until it reaches the
length of the filterPktData object.

filterPktDataNotMask OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The inversion mask that is applied to the match
process. After adjusting this mask for the offset,
those relevant bits in the received packet that correspond
to bits cleared in this mask must all be equal to their
corresponding bits in the filterPktData object for the packet
to be accepted. In addition, at least one of those relevant
bits in the received packet that correspond to bits set in
this mask must be different to its corresponding bit in the
filterPktData object.
For the purposes of the matching algorithm, if the associated

filterPktData object is longer than this mask, this mask is
conceptually extended with '0' bits until it reaches the
length of the filterPktData object.

filterPktStatus OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The status that is to be matched with the input packet.
The only bits relevant to this match algorithm are those that
have the corresponding filterPktStatusMask bit equal to one.
The following two rules are then applied to every packet:
(1) For each relevant bit from the packet status with the
corresponding filterPktStatusNotMask bit set to zero, if
the bit from the packet status is not equal to the

corresponding bit from the filterPktStatus, then the

packet will fail this status match.
(2) If for every relevant bit from the packet status with the
corresponding filterPktStatusNotMask bit set to one, the
bit from the packet status is equal to the corresponding
bit from the filterPktStatus, then the packet will fail
this status match.
Any packets that have not failed either of the two matches
above have passed this status match. In particular, a zero
length status filter will match any packet's status.
The value of the packet status is a sum. This sum

initially takes the value zero. Then, for each
error, E, that has been discovered in this packet,
2 raised to a value representing E is added to the sum.
The errors and the bits that represent them are dependent
on the media type of the interface that this channel
is receiving packets from.
The errors defined for a packet captured off of an

Ethernet interface are as follows:
bit # Error
0 Packet is longer than 1518 octets
1 Packet is shorter than 64 octets
2 Packet experienced a CRC or Alignment error
For example, an Ethernet fragment would have a

value of 6 (2^1 + 2^2).
As this MIB is expanded to new media types, this object

will have other media-specific errors defined.
For the purposes of this status matching algorithm, if the

packet status is longer than this filterPktStatus object,
this object is conceptually extended with '0' bits until it
reaches the size of the packet status.

filterPktStatusMask OBJECT-TYPE
SYNTAX Integer32
STATUS current

DESCRIPTION
"The mask that is applied to the status match process.
Only those bits in the received packet that correspond to
bits set in this mask are relevant for further processing
by the status match algorithm. For the purposes
of the matching algorithm, if the associated filterPktStatus
object is longer than this mask, this mask is conceptually
extended with '1' bits until it reaches the size of the
filterPktStatus. In addition, if a packet status is longer
than this mask, this mask is conceptually extended with '0'
bits until it reaches the size of the packet status.

filterPktStatusNotMask OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"The inversion mask that is applied to the status match
process. Those relevant bits in the received packet status
that correspond to bits cleared in this mask must all be
equal to their corresponding bits in the filterPktStatus
object for the packet to be accepted. In addition, at least
one of those relevant bits in the received packet status
that correspond to bits set in this mask must be different
to its corresponding bit in the filterPktStatus object for
the packet to be accepted.
For the purposes of the matching algorithm, if the associated

filterPktStatus object or a packet status is longer than this
mask, this mask is conceptually extended with '0' bits until
it reaches the longer of the lengths of the filterPktStatus
object and the packet status.

filterOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION

filterStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this filter entry."
channelTable OBJECT-TYPE
SYNTAX SEQUENCE OF ChannelEntry
STATUS current
DESCRIPTION
"A list of packet channel entries."
::= { filter 2 }
channelEntry OBJECT-TYPE
SYNTAX ChannelEntry
STATUS current
DESCRIPTION
"A set of parameters for a packet channel applied on a
particular interface. As an example, an instance of the
channelMatches object might be named channelMatches.3"
INDEX { channelIndex }
::= { channelTable 1 }
ChannelEntry ::= SEQUENCE {

channelIndex Integer32,
channelIfIndex Integer32,
channelAcceptType INTEGER,
channelDataControl INTEGER,
channelTurnOnEventIndex Integer32,
channelTurnOffEventIndex Integer32,
channelEventIndex Integer32,
channelEventStatus INTEGER,
channelMatches Counter32,
channelDescription DisplayString,
channelOwner OwnerString,
channelStatus EntryStatus
}
channelIndex OBJECT-TYPE
STATUS current

DESCRIPTION
"An index that uniquely identifies an entry in the channel
table. Each such entry defines one channel, a logical
data and event stream.
It is suggested that before creating a channel, an

application should scan all instances of the
filterChannelIndex object to make sure that there are no
pre-existing filters that would be inadvertently be linked
to the channel."
::= { channelEntry 1 }
channelIfIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The value of this object uniquely identifies the
interface on this remote network monitoring device to which
the associated filters are applied to allow data into this
channel. The interface identified by a particular value
of this object is the same interface as identified by the
same value of the ifIndex object, defined in RFC 2233 [17].
The filters in this group are applied to all packets on

the local network segment attached to the identified
interface.


channelStatus object is equal to valid(1)."
channelAcceptType OBJECT-TYPE
SYNTAX INTEGER {
acceptMatched(1),
acceptFailed(2)
}
STATUS current
DESCRIPTION

"This object controls the action of the filters

associated with this channel. If this object is equal
to acceptMatched(1), packets will be accepted to this
channel if they are accepted by both the packet data and
packet status matches of an associated filter. If
this object is equal to acceptFailed(2), packets will
be accepted to this channel only if they fail either
the packet data match or the packet status match of
each of the associated filters.
In particular, a channel with no associated filters will

match no packets if set to acceptMatched(1) case and will
match all packets in the acceptFailed(2) case.

channelDataControl OBJECT-TYPE
SYNTAX INTEGER {
on(1),
off(2)
}
STATUS current
DESCRIPTION
"This object controls the flow of data through this channel.
If this object is on(1), data, status and events flow
through this channel. If this object is off(2), data,
status and events will not flow through this channel."
DEFVAL { off }
channelTurnOnEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The value of this object identifies the event
that is configured to turn the associated
channelDataControl from off to on when the event is
generated. The event identified by a particular value
of this object is the same event as identified by the
same value of the eventIndex object. If there is no
corresponding entry in the eventTable, then no
association exists. In fact, if no event is intended
for this channel, channelTurnOnEventIndex must be
set to zero, a non-existent event index.


channelTurnOffEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
that is configured to turn the associated
channelDataControl from on to off when the event is
generated. The event identified by a particular value
for this channel, channelTurnOffEventIndex must be

channelEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
that is configured to be generated when the
associated channelDataControl is on and a packet
is matched. The event identified by a particular value
for this channel, channelEventIndex must be

channelEventStatus OBJECT-TYPE
SYNTAX INTEGER {
eventReady(1),
eventFired(2),

eventAlwaysReady(3)
}
STATUS current
DESCRIPTION
"The event status of this channel.
If this channel is configured to generate events

when packets are matched, a means of controlling
the flow of those events is often needed. When
this object is equal to eventReady(1), a single
event may be generated, after which this object
will be set by the probe to eventFired(2). While
in the eventFired(2) state, no events will be
generated until the object is modified to
eventReady(1) (or eventAlwaysReady(3)). The
management station can thus easily respond to a
notification of an event by re-enabling this object.
If the management station wishes to disable this

flow control and allow events to be generated
at will, this object may be set to
eventAlwaysReady(3). Disabling the flow control
is discouraged as it can result in high network
traffic or other performance problems."
DEFVAL { eventReady }
channelMatches OBJECT-TYPE
SYNTAX Counter32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of times this channel has matched a packet.
Note that this object is updated even when
channelDataControl is set to off."
channelDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..127))
STATUS current
DESCRIPTION
"A comment describing this channel."
channelOwner OBJECT-TYPE

SYNTAX OwnerString
STATUS current
DESCRIPTION
channelStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this channel entry."
-- The Packet Capture Group
-- Implementation of the Packet Capture group is optional. The Packet

-- Capture Group requires implementation of the Filter Group.
--
-- The Packet Capture group allows packets to be captured
-- upon a filter match. The bufferControlTable controls
-- the captured packets output from a channel that is
-- associated with it. The captured packets are placed
-- in entries in the captureBufferTable. These entries are
-- associated with the bufferControlEntry on whose behalf they
-- were stored.
bufferControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF BufferControlEntry
STATUS current
DESCRIPTION
"A list of buffers control entries."
::= { capture 1 }
bufferControlEntry OBJECT-TYPE
SYNTAX BufferControlEntry
STATUS current
DESCRIPTION
"A set of parameters that control the collection of a stream
of packets that have matched filters. As an example, an
instance of the bufferControlCaptureSliceSize object might
be named bufferControlCaptureSliceSize.3"

INDEX { bufferControlIndex }
::= { bufferControlTable 1 }
BufferControlEntry ::= SEQUENCE {

bufferControlIndex Integer32,
bufferControlChannelIndex Integer32,
bufferControlFullStatus INTEGER,
bufferControlFullAction INTEGER,
bufferControlCaptureSliceSize Integer32,
bufferControlDownloadSliceSize Integer32,
bufferControlDownloadOffset Integer32,
bufferControlMaxOctetsRequested Integer32,
bufferControlMaxOctetsGranted Integer32,
bufferControlCapturedPackets Integer32,
bufferControlTurnOnTime TimeTicks,
bufferControlOwner OwnerString,
bufferControlStatus EntryStatus
}
bufferControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION
in the bufferControl table. The value of this
index shall never be zero. Each such
entry defines one set of packets that is
captured and controlled by one or more filters."
::= { bufferControlEntry 1 }
bufferControlChannelIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"An index that identifies the channel that is the
source of packets for this bufferControl table.
The channel identified by a particular value of this
index is the same as identified by the same value of
the channelIndex object.

bufferControlStatus object is equal to valid(1)."
bufferControlFullStatus OBJECT-TYPE
SYNTAX INTEGER {

spaceAvailable(1),
full(2)
}
STATUS current
DESCRIPTION
"This object shows whether the buffer has room to
accept new packets or if it is full.
If the status is spaceAvailable(1), the buffer is

accepting new packets normally. If the status is
full(2) and the associated bufferControlFullAction
object is wrapWhenFull, the buffer is accepting new
packets by deleting enough of the oldest packets
to make room for new ones as they arrive. Otherwise,
if the status is full(2) and the
bufferControlFullAction object is lockWhenFull,
then the buffer has stopped collecting packets.
When this object is set to full(2) the probe must

not later set it to spaceAvailable(1) except in the
case of a significant gain in resources such as
an increase of bufferControlOctetsGranted. In
particular, the wrap-mode action of deleting old
packets to make room for newly arrived packets
must not affect the value of this object."
bufferControlFullAction OBJECT-TYPE
SYNTAX INTEGER {
lockWhenFull(1),
wrapWhenFull(2) -- FIFO
}
STATUS current
DESCRIPTION
"Controls the action of the buffer when it
reaches the full status. When in the lockWhenFull(1)
state and a packet is added to the buffer that
fills the buffer, the bufferControlFullStatus will
be set to full(2) and this buffer will stop capturing
packets."
bufferControlCaptureSliceSize OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"

STATUS current
DESCRIPTION
"The maximum number of octets of each packet
that will be saved in this capture buffer.
For example, if a 1500 octet packet is received by
the probe and this object is set to 500, then only
500 octets of the packet will be stored in the
associated capture buffer. If this variable is set
to 0, the capture buffer will save as many octets
as is possible.

bufferControlStatus object is equal to valid(1)."
DEFVAL { 100 }
bufferControlDownloadSliceSize OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION
"The maximum number of octets of each packet
in this capture buffer that will be returned in
an SNMP retrieval of that packet. For example,
if 500 octets of a packet have been stored in the
associated capture buffer, the associated
bufferControlDownloadOffset is 0, and this
object is set to 100, then the captureBufferPacket
object that contains the packet will contain only
the first 100 octets of the packet.
A prudent manager will take into account possible

interoperability or fragmentation problems that may
occur if the download slice size is set too large.
In particular, conformant SNMP implementations are not
required to accept messages whose length exceeds 484
octets, although they are encouraged to support larger
datagrams whenever feasible."
DEFVAL { 100 }
bufferControlDownloadOffset OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION

"The offset of the first octet of each packet

in this capture buffer that will be returned in
an SNMP retrieval of that packet. For example,
if 500 octets of a packet have been stored in the
associated capture buffer and this object is set to
100, then the captureBufferPacket object that
contains the packet will contain bytes starting
100 octets into the packet."
DEFVAL { 0 }
bufferControlMaxOctetsRequested OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION
"The requested maximum number of octets to be
saved in this captureBuffer, including any
implementation-specific overhead. If this variable
is set to -1, the capture buffer will save as many
octets as is possible.

should set bufferControlMaxOctetsGranted as closely
to this object as is possible for the particular probe
implementation and available resources. However, if
the object has the special value of -1, the probe
must set bufferControlMaxOctetsGranted to -1."
DEFVAL { -1 }
bufferControlMaxOctetsGranted OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION
"The maximum number of octets that can be
saved in this captureBuffer, including overhead.
If this variable is -1, the capture buffer will save
as many octets as possible.
When the bufferControlMaxOctetsRequested object is

created or modified, the probe should set this object
as closely to the requested value as is possible for the
particular probe implementation and available resources.
However, if the request object has the special value

of -1, the probe must set this object to -1.
The probe must not lower this value except as a result of

a modification to the associated
bufferControlMaxOctetsRequested object.
When this maximum number of octets is reached

and a new packet is to be added to this
capture buffer and the corresponding
bufferControlFullAction is set to wrapWhenFull(2),
enough of the oldest packets associated with this
capture buffer shall be deleted by the agent so
that the new packet can be added. If the corresponding
bufferControlFullAction is set to lockWhenFull(1),
the new packet shall be discarded. In either case,
the probe must set bufferControlFullStatus to
full(2).
When the value of this object changes to a value less

than the current value, entries are deleted from
the captureBufferTable associated with this
bufferControlEntry. Enough of the
oldest of these captureBufferEntries shall be
deleted by the agent so that the number of octets
used remains less than or equal to the new value of
this object.
When the value of this object changes to a value greater

than the current value, the number of associated
captureBufferEntries may be allowed to grow."
bufferControlCapturedPackets OBJECT-TYPE
SYNTAX Integer32
UNITS "Packets"
STATUS current
DESCRIPTION
"The number of packets currently in this captureBuffer."
bufferControlTurnOnTime OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime when this capture buffer was
first turned on."

bufferControlOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
bufferControlStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this buffer Control Entry."
captureBufferTable OBJECT-TYPE
SYNTAX SEQUENCE OF CaptureBufferEntry
STATUS current
DESCRIPTION
"A list of packets captured off of a channel."
::= { capture 2 }
captureBufferEntry OBJECT-TYPE
SYNTAX CaptureBufferEntry
STATUS current
DESCRIPTION
"A packet captured off of an attached network. As an
example, an instance of the captureBufferPacketData
object might be named captureBufferPacketData.3.1783"
INDEX { captureBufferControlIndex, captureBufferIndex }
::= { captureBufferTable 1 }
CaptureBufferEntry ::= SEQUENCE {

captureBufferControlIndex Integer32,
captureBufferIndex Integer32,
captureBufferPacketID Integer32,
captureBufferPacketData OCTET STRING,
captureBufferPacketLength Integer32,
captureBufferPacketTime Integer32,
captureBufferPacketStatus Integer32
}

captureBufferControlIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The index of the bufferControlEntry with which
this packet is associated."
::= { captureBufferEntry 1 }
captureBufferIndex OBJECT-TYPE
STATUS current
DESCRIPTION
in the captureBuffer table associated with a
particular bufferControlEntry. This index will
start at 1 and increase by one for each new packet
added with the same captureBufferControlIndex.
Should this value reach 2147483647, the next packet

added with the same captureBufferControlIndex shall
cause this value to wrap around to 1."
captureBufferPacketID OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"An index that describes the order of packets
that are received on a particular interface.
The packetID of a packet captured on an
interface is defined to be greater than the
packetID's of all packets captured previously on
the same interface. As the captureBufferPacketID
object has a maximum positive value of 2^31 - 1,
any captureBufferPacketID object shall have the
value of the associated packet's packetID mod 2^31."
captureBufferPacketData OBJECT-TYPE
SYNTAX OCTET STRING
STATUS current
DESCRIPTION
"The data inside the packet, starting at the beginning
of the packet plus any offset specified in the

associated bufferControlDownloadOffset, including any

link level headers. The length of the data in this object
is the minimum of the length of the captured packet minus
the offset, the length of the associated
bufferControlCaptureSliceSize minus the offset, and the
associated bufferControlDownloadSliceSize. If this minimum
is less than zero, this object shall have a length of zero."
captureBufferPacketLength OBJECT-TYPE
SYNTAX Integer32
UNITS "Octets"
STATUS current
DESCRIPTION
"The actual length (off the wire) of the packet stored
in this entry, including FCS octets."
captureBufferPacketTime OBJECT-TYPE
SYNTAX Integer32
UNITS "Milliseconds"
STATUS current
DESCRIPTION
"The number of milliseconds that had passed since
this capture buffer was first turned on when this
packet was captured."
captureBufferPacketStatus OBJECT-TYPE
SYNTAX Integer32
STATUS current
DESCRIPTION
"A value which indicates the error status of this packet.
The value of this object is defined in the same way as

filterPktStatus. The value is a sum. This sum
initially takes the value zero. Then, for each
error, E, that has been discovered in this packet,
2 raised to a value representing E is added to the sum.
The errors defined for a packet captured off of an

Ethernet interface are as follows:
bit # Error
0 Packet is longer than 1518 octets

1 Packet is shorter than 64 octets

2 Packet experienced a CRC or Alignment error
3 First packet in this capture buffer after
it was detected that some packets were
not processed correctly.
4 Packet's order in buffer is only approximate
(May only be set for packets sent from
the probe)
For example, an Ethernet fragment would have a

value of 6 (2^1 + 2^2).
As this MIB is expanded to new media types, this object

will have other media-specific errors defined."
-- The Event Group
-- Implementation of the Event group is optional.

--
-- The Event group controls the generation and notification
-- of events from this device. Each entry in the eventTable
-- describes the parameters of the event that can be triggered.
-- Each event entry is fired by an associated condition located
-- elsewhere in the MIB. An event entry may also be associated
-- with a function elsewhere in the MIB that will be executed
-- when the event is generated. For example, a channel may
-- be turned on or off by the firing of an event.
--
-- Each eventEntry may optionally specify that a log entry
-- be created on its behalf whenever the event occurs.
-- Each entry may also specify that notification should
-- occur by way of SNMP trap messages. In this case, the
-- community for the trap message is given in the associated
-- eventCommunity object. The enterprise and specific trap
-- fields of the trap are determined by the condition that
-- triggered the event. Two traps are defined: risingAlarm and
-- fallingAlarm. If the eventTable is triggered by a condition
-- specified elsewhere, the enterprise and specific trap fields
-- must be specified for traps generated for that condition.
eventTable OBJECT-TYPE
SYNTAX SEQUENCE OF EventEntry
STATUS current
DESCRIPTION

"A list of events to be generated."

::= { event 1 }
eventEntry OBJECT-TYPE
SYNTAX EventEntry
STATUS current
DESCRIPTION
"A set of parameters that describe an event to be generated
when certain conditions are met. As an example, an instance
of the eventLastTimeSent object might be named
eventLastTimeSent.6"
INDEX { eventIndex }
::= { eventTable 1 }
EventEntry ::= SEQUENCE {

eventIndex Integer32,
eventDescription DisplayString,
eventType INTEGER,
eventCommunity OCTET STRING,
eventLastTimeSent TimeTicks,
eventOwner OwnerString,
eventStatus EntryStatus
}
eventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
event table. Each such entry defines one event that
is to be generated when the appropriate conditions
occur."
::= { eventEntry 1 }
eventDescription OBJECT-TYPE
STATUS current
DESCRIPTION
"A comment describing this event entry."
eventType OBJECT-TYPE
SYNTAX INTEGER {
none(1),
log(2),

snmptrap(3), -- send an SNMP trap

logandtrap(4)
}
STATUS current
DESCRIPTION
"The type of notification that the probe will make
about this event. In the case of log, an entry is
made in the log table for each event. In the case of
snmp-trap, an SNMP trap is sent to one or more
management stations."
eventCommunity OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..127))
STATUS current
DESCRIPTION
"If an SNMP trap is to be sent, it will be sent to
the SNMP community specified by this octet string."
eventLastTimeSent OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime at the time this event
entry last generated an event. If this entry has
not generated any events, this value will be
zero."
eventOwner OBJECT-TYPE
SYNTAX OwnerString
STATUS current
DESCRIPTION
using the resources assigned to it.
If this object contains a string starting with 'monitor'

and has associated entries in the log table, all connected
management stations should retrieve those log entries,
as they may have significance to all management stations
connected to this device"

eventStatus OBJECT-TYPE
SYNTAX EntryStatus
STATUS current
DESCRIPTION
"The status of this event entry.

log entries shall be deleted by the agent."
--
logTable OBJECT-TYPE
SYNTAX SEQUENCE OF LogEntry
STATUS current
DESCRIPTION
"A list of events that have been logged."
::= { event 2 }
logEntry OBJECT-TYPE
SYNTAX LogEntry
STATUS current
DESCRIPTION
"A set of data describing an event that has been
logged. For example, an instance of the logDescription
object might be named logDescription.6.47"
INDEX { logEventIndex, logIndex }
::= { logTable 1 }
LogEntry ::= SEQUENCE {

logEventIndex Integer32,
logIndex Integer32,
logTime TimeTicks,
logDescription DisplayString
}
logEventIndex OBJECT-TYPE
STATUS current
DESCRIPTION
"The event entry that generated this log
entry. The log identified by a particular
value of this index is associated with the same
eventEntry as identified by the same value
of eventIndex."

::= { logEntry 1 }
logIndex OBJECT-TYPE
STATUS current
DESCRIPTION
in the log table amongst those generated by the
same eventEntries. These indexes are
assigned beginning with 1 and increase by one
with each new log entry. The association
between values of logIndex and logEntries
is fixed for the lifetime of each logEntry.
The agent may choose to delete the oldest
instances of logEntry as required because of
lack of memory. It is an implementation-specific
matter as to when this deletion may occur."
::= { logEntry 2 }
logTime OBJECT-TYPE
SYNTAX TimeTicks
STATUS current
DESCRIPTION
"The value of sysUpTime when this log entry was created."
::= { logEntry 3 }
logDescription OBJECT-TYPE
STATUS current
DESCRIPTION
"An implementation dependent description of the
event that activated this log entry."
::= { logEntry 4 }
-- Remote Network Monitoring Traps
rmonEventsV2 OBJECT-IDENTITY
STATUS current
DESCRIPTION "Definition point for RMON notifications."
::= { rmon 0 }
risingAlarm NOTIFICATION-TYPE
OBJECTS { alarmIndex, alarmVariable, alarmSampleType,
alarmValue, alarmRisingThreshold }
STATUS current

DESCRIPTION
"The SNMP trap that is generated when an alarm
entry crosses its rising threshold and generates
an event that is configured for sending SNMP
traps."
::= { rmonEventsV2 1 }
fallingAlarm NOTIFICATION-TYPE
OBJECTS { alarmIndex, alarmVariable, alarmSampleType,
alarmValue, alarmFallingThreshold }
STATUS current
DESCRIPTION
"The SNMP trap that is generated when an alarm
entry crosses its falling threshold and generates
an event that is configured for sending SNMP
traps."
::= { rmonEventsV2 2 }
-- Conformance information
rmonCompliances OBJECT IDENTIFIER ::= { rmonConformance 9 }

rmonGroups OBJECT IDENTIFIER ::= { rmonConformance 10 }
-- Compliance Statements
rmonCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The requirements for conformance to the RMON MIB. At least
one of the groups in this module must be implemented to
conform to the RMON MIB. Implementations of this MIB
must also implement the system group of MIB-II [16] and the
IF-MIB [17]."
MODULE -- this module
GROUP rmonEtherStatsGroup
DESCRIPTION
"The RMON Ethernet Statistics Group is optional."
GROUP rmonHistoryControlGroup
DESCRIPTION
"The RMON History Control Group is optional."
GROUP rmonEthernetHistoryGroup
DESCRIPTION
"The RMON Ethernet History Group is optional."
GROUP rmonAlarmGroup
DESCRIPTION

"The RMON Alarm Group is optional."
GROUP rmonHostGroup
DESCRIPTION
"The RMON Host Group is mandatory when the
rmonHostTopNGroup is implemented."
GROUP rmonHostTopNGroup
DESCRIPTION
"The RMON Host Top N Group is optional."
GROUP rmonMatrixGroup
DESCRIPTION
"The RMON Matrix Group is optional."
GROUP rmonFilterGroup
DESCRIPTION
"The RMON Filter Group is mandatory when the
rmonPacketCaptureGroup is implemented."
GROUP rmonPacketCaptureGroup
DESCRIPTION
"The RMON Packet Capture Group is optional."
GROUP rmonEventGroup
DESCRIPTION
"The RMON Event Group is mandatory when the
rmonAlarmGroup is implemented."
::= { rmonCompliances 1 }
rmonEtherStatsGroup OBJECT-GROUP
OBJECTS {
etherStatsIndex, etherStatsDataSource,
etherStatsDropEvents, etherStatsOctets, etherStatsPkts,
etherStatsBroadcastPkts, etherStatsMulticastPkts,
etherStatsCRCAlignErrors, etherStatsUndersizePkts,
etherStatsOversizePkts, etherStatsFragments,
etherStatsJabbers, etherStatsCollisions,
etherStatsPkts64Octets, etherStatsPkts65to127Octets,
etherStatsPkts128to255Octets,
etherStatsOwner, etherStatsStatus
}
STATUS current
DESCRIPTION
"The RMON Ethernet Statistics Group."

::= { rmonGroups 1 }
rmonHistoryControlGroup OBJECT-GROUP
OBJECTS {
historyControlIndex, historyControlDataSource,
historyControlBucketsRequested,
historyControlBucketsGranted, historyControlInterval,
historyControlOwner, historyControlStatus
}
STATUS current
DESCRIPTION
"The RMON History Control Group."
rmonEthernetHistoryGroup OBJECT-GROUP
OBJECTS {
etherHistoryIndex, etherHistorySampleIndex,
etherHistoryIntervalStart, etherHistoryDropEvents,
etherHistoryOctets, etherHistoryPkts,
etherHistoryBroadcastPkts, etherHistoryMulticastPkts,
etherHistoryCRCAlignErrors, etherHistoryUndersizePkts,
etherHistoryOversizePkts, etherHistoryFragments,
etherHistoryJabbers, etherHistoryCollisions,
etherHistoryUtilization
}
STATUS current
DESCRIPTION
"The RMON Ethernet History Group."
rmonAlarmGroup OBJECT-GROUP
OBJECTS {
alarmIndex, alarmInterval, alarmVariable,
alarmSampleType, alarmValue, alarmStartupAlarm,
alarmRisingThreshold, alarmFallingThreshold,
alarmRisingEventIndex, alarmFallingEventIndex,
alarmOwner, alarmStatus
}
STATUS current
DESCRIPTION
"The RMON Alarm Group."
rmonHostGroup OBJECT-GROUP
OBJECTS {
hostControlIndex, hostControlDataSource,
hostControlTableSize, hostControlLastDeleteTime,
hostControlOwner, hostControlStatus,

hostAddress, hostCreationOrder, hostIndex,

hostInPkts, hostOutPkts, hostInOctets,
hostOutOctets, hostOutErrors, hostOutBroadcastPkts,
hostOutMulticastPkts, hostTimeAddress,
hostTimeCreationOrder, hostTimeIndex,
hostTimeInPkts, hostTimeOutPkts, hostTimeInOctets,
hostTimeOutOctets, hostTimeOutErrors,
hostTimeOutBroadcastPkts, hostTimeOutMulticastPkts
}
STATUS current
DESCRIPTION
"The RMON Host Group."
rmonHostTopNGroup OBJECT-GROUP
OBJECTS {
hostTopNControlIndex, hostTopNHostIndex,
hostTopNRateBase, hostTopNTimeRemaining,
hostTopNDuration, hostTopNRequestedSize,
hostTopNGrantedSize, hostTopNStartTime,
hostTopNOwner, hostTopNStatus,
hostTopNReport, hostTopNIndex,
hostTopNAddress, hostTopNRate
}
STATUS current
DESCRIPTION
"The RMON Host Top 'N' Group."
rmonMatrixGroup OBJECT-GROUP
OBJECTS {
matrixControlIndex, matrixControlDataSource,
matrixControlTableSize, matrixControlLastDeleteTime,
matrixControlOwner, matrixControlStatus,
matrixSDSourceAddress, matrixSDDestAddress,
matrixSDIndex, matrixSDPkts,
matrixSDOctets, matrixSDErrors,
matrixDSSourceAddress, matrixDSDestAddress,
matrixDSIndex, matrixDSPkts,
matrixDSOctets, matrixDSErrors
}
STATUS current
DESCRIPTION
"The RMON Matrix Group."
rmonFilterGroup OBJECT-GROUP
OBJECTS {

filterIndex, filterChannelIndex, filterPktDataOffset,

filterPktData, filterPktDataMask,
filterPktDataNotMask, filterPktStatus,
filterPktStatusMask, filterPktStatusNotMask,
filterOwner, filterStatus,
channelIndex, channelIfIndex, channelAcceptType,
channelDataControl, channelTurnOnEventIndex,
channelTurnOffEventIndex, channelEventIndex,
channelEventStatus, channelMatches,
channelDescription, channelOwner, channelStatus
}
STATUS current
DESCRIPTION
"The RMON Filter Group."
rmonPacketCaptureGroup OBJECT-GROUP
OBJECTS {
bufferControlIndex, bufferControlChannelIndex,
bufferControlFullStatus, bufferControlFullAction,
bufferControlCaptureSliceSize,
bufferControlDownloadSliceSize,
bufferControlDownloadOffset,
bufferControlMaxOctetsRequested,
bufferControlMaxOctetsGranted,
bufferControlCapturedPackets,
bufferControlTurnOnTime,
bufferControlOwner, bufferControlStatus,
captureBufferControlIndex, captureBufferIndex,
captureBufferPacketID, captureBufferPacketData,
captureBufferPacketLength, captureBufferPacketTime,
captureBufferPacketStatus
}
STATUS current
DESCRIPTION
"The RMON Packet Capture Group."
rmonEventGroup OBJECT-GROUP
OBJECTS {
eventIndex, eventDescription, eventType,
eventCommunity, eventLastTimeSent,
eventOwner, eventStatus,
logEventIndex, logIndex, logTime,
logDescription
}
STATUS current
DESCRIPTION

"The RMON Event Group."

rmonNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS { risingAlarm, fallingAlarm }
STATUS current
DESCRIPTION
"The RMON Notification Group."
END
6. Security Considerations
In order to implement this MIB, a probe must capture all packets on

the locally-attached network, including packets between third
parties. These packets are analyzed to collect network addresses,
protocol usage information, and conversation statistics. Data of this
nature may be considered sensitive in some environments. In such
environments the administrator may wish to restrict SNMP access to
the probe.
This MIB also includes functions for returning the contents of

captured packets, potentially including sensitive user data or
passwords. It is recommended that SNMP access to these functions be
restricted.
There are a number of management objects defined in this MIB that

have a MAX-ACCESS clause of read-write and/or read-create. Such
objects may be considered sensitive or vulnerable in some network
environments. The support for SET operations in a non-secure
environment without proper protection can have a negative effect on
network operations.
SNMPv1 by itself is not a secure environment. Even if the network

itself is secure (for example by using IPSec), even then, there is no
control as to who on the secure network is allowed to access and
GET/SET (read/change/create/delete) the objects in this MIB.
It is recommended that the implementors consider the security

features as provided by the SNMPv3 framework. Specifically, the use
of the User-based Security Model RFC 2574 [12] and the View-based
Access Control Model RFC 2575 [15] is recommended.
It is then a customer/user responsibility to ensure that the SNMP

entity giving access to an instance of this MIB, is properly
configured to give access to the objects only to those principals
(users) that have legitimate rights to indeed GET or SET
(change/create/delete) them.

7. Acknowledgments
This document was produced by the IETF Remote Network Monitoring

Working Group.
8. Author's Address
Steve Waldbusser
Phone: +1-650-948-6500
Fax: +1-650-745-0671
Email: waldbusser@nextbeacon.com
9. References
[1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for
Describing SNMP Management Frameworks", RFC 2571, April 1999.
[2] Rose, M. and K. McCloghrie, "Structure and Identification of

Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,

RFC 1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the
SNMP", RFC 1215, March 1991.
[5] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Structure of Management Information
Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
RFC 2579, April 1999.
M. and S. Waldbusser, "Conformance Statements for SMIv2", STD
58, RFC 2580, April 1999.
[8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple

Network Management Protocol", STD 15, RFC 1157, May 1990.
[9] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,

"Introduction to Community-based SNMPv2", RFC 1901, January
1996.

[10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport

Mappings for Version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1906, January 1996.
[11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message

Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC 2572, April 1999.
[12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)

for version 3 of the Simple Network Management Protocol
(SNMPv3)", RFC 2574, April 1999.
[13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol

Operations for Version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1905, January 1996.
[14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC

2573, April 1999.
[15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access

Control Model (VACM) for the Simple Network Management Protocol
(SNMP)", RFC 2575, April 1999.
[16] McCloghrie, K. and M. Rose, Editors, "Management Information

Base for Network Management of TCP/IP-based internets: MIB-II",
STD 17, RFC 1213, March 1991.
[17] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB

using SMIv2", RFC 2233, November 1997.
[18] Waldbusser, S., "Remote Network Monitoring MIB", RFC 1757,

February 1995.
[19] Waldbusser, S., "Token Ring Extensions to the Remote Network

Monitoring MIB", RFC 1513, September 1993.
[20] Waldbusser, S., "Remote Network Monitoring Management

Information Base Version 2 using SMIv2", RFC 2021, January 1997.
[21] Waterman, R., Lahaye, B., Romascanu, D. and S. Waldbusser,

"Remote Network Monitoring MIB Extensions for Switched Networks
Version 1.0", RFC 2613, June 1999.
[22] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction

to Version 3 of the Internet-standard Network Management
Framework", RFC 2570, April 1999.

10. Intellectual Property
The IETF takes no position regarding the validity or scope of any

intellectual property or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; neither does it represent that it
has made any effort to identify any such rights. Information on the
IETF's procedures with respect to rights in standards-track and
standards-related documentation can be found in BCP-11. Copies of
claims of rights made available for publication and any assurances of
licenses to be made available, or the result of an attempt made to
obtain a general license or permission for the use of such
proprietary rights by implementors or users of this specification can
be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights which may cover technology that may be required to practice
this standard. Please address the information to the IETF Executive
Director.

11. Full Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and furnished to

others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the

Internet Society.

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Network Working Group S.

Remote Network Monitoring Management Information Base

Status of this Memo

This document specifies an Internet standards track protocol for the

Copyright (C) The Internet Society (2000). All Rights Reserved.

This memo defines a portion of the Management Information Base (MIB)

Waldbusser Standards Track [Page 1]

1 The SNMP Management Framework .............................. 2

1. The SNMP Management Framework

The SNMP Management Framework presently consists of five major

o An overall architecture, described in RFC 2571 [1].

o Message protocols for transferring management information. The

Waldbusser Standards Track [Page 2]

1906 [10]. The third version of the message protocol is called

o Protocol operations for accessing management information. The

o A set of fundamental applications described in RFC 2573 [14] and

A more detailed introduction to the current SNMP Management Framework

Managed objects are accessed via a virtual information store, termed

This memo specifies a MIB module that is compliant to the SMIv2. A

Remote network monitoring devices, often called monitors or probes,

The objects defined in this document are intended as an interface

Waldbusser Standards Track [Page 3]

tolerate the complexity of manually manipulating objects to

2.1. Remote Network Management Goals

For this reason, this MIB allows a probe to be configured to

Waldbusser Standards Track [Page 4]

about the failure. This historical information can be played

o Problem Detection and Reporting

o Value Added Data

2.2. Textual Conventions

2.3. Structure of MIB

The objects are arranged into the following groups:

Waldbusser Standards Track [Page 5]

These groups are the basic unit of conformance. If a remote

All groups in this MIB are optional. Implementations of this MIB

These groups are defined to provide a means of assigning object

2.3.1. The Ethernet Statistics Group

The ethernet statistics group contains statistics measured by the

2.3.2. The History Control Group

The history control group controls the periodic statistical sampling

2.3.3. The Ethernet History Group

The ethernet history group records periodic statistical samples from

Waldbusser Standards Track [Page 6]

2.3.4. The Alarm Group

The alarm group periodically takes statistical samples from variables

A hysteresis mechanism is implemented to limit the generation of

2.3.5. The Host Group

The host group contains statistics associated with each host

2.3.6. The HostTopN Group

2.3.7. The Matrix Group

The matrix group stores statistics for conversations between sets of

2.3.8. The Filter Group

The filter group allows packets to be matched by a filter equation.

Waldbusser Standards Track [Page 7]

2.3.9. The Packet Capture Group

The Packet Capture group allows packets to be captured after they

2.3.10. The Event Group

The event group controls the generation and notification of events

3. Control of Remote Network Monitoring Devices