JP2015061229A - Method and system for switching edge router, edge router, and redundant management device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time when service of a user to whom priority is given is interrupted when a redundant edge router is switched.SOLUTION: A switching destination edge router identifies a user ID and a service type of an arrived user packet. Storage means for previously storing a user to whom priority is given or a service type is referred to on the basis of the user ID or the service type. When the user ID or the service type exists in the storage means, a download interruption request of user specific information including the user ID is given to a redundant management device. The redundant management device transmits the user specific information corresponding to the user ID included in the download interruption request to the switching destination edge router.

Description

  The present invention relates to an edge router switching method and system, an edge router, and a redundancy management device, and more particularly, in a network in which a user terminal is connected to a plurality of active edge routers and spare edge routers, when a working router fails, the spare edge The present invention relates to an edge router switching method and system for switching to a router, an edge router, and a redundancy management device.

  FIG. 1 is a diagram illustrating an operation in a conventional system.

  The system shown in FIG. 1 includes a user terminal 1, a plurality of active edge routers 2, a plurality of spare edge routers 3, and a redundancy management device 4 having a user management DB.

  In a system in which edge routers are made redundant as shown in the figure, VRRP (Virtual Router Redundancy Protocol) is used, and user specific information is registered in the redundancy management device 4 in the order of users who have transmitted packets. Is set. In the conventional system, when the user-specific information is not registered in the redundancy management device 4 and the backup edge router 3 transmits a packet from the user, the user's packet is discarded or the redundancy management device 4 In response, a request for setting user-specific information is transmitted.

In particular,
(1) Assume that edge switching occurs in the working edge router 2 and the user side port and core side port of the working edge router 1 are blocked.

  (2) The user terminal 1 switches the route to the backup edge router 3 because the user side port of the working edge router 2 is blocked.

  (3) The spare edge router 3 requests user-specific information (for example, filtering information) from the redundancy management device 4.

  (4) The redundancy management device 4 retrieves user-specific information from the user management DB and downloads it to the spare edge router 3.

  (5) The spare edge router 3 registers user-specific information therein and starts communication between user terminals.

Virtual Router Redundancy Protocol, "RFC 3768", http://www.ietf.org/rfc/rfc3768.txt

  As described above, in switching from the active edge router to the standby edge router in the conventional system, communication with the user terminal can be performed by downloading the user specific information from the redundancy management device to the switching destination edge router (backup edge router). Recover.

  However, since there is no unique setting information for each user in the packet sent from the user terminal when the user specific information is not yet registered in the redundancy management device in the spare edge router of the switching destination, the spare edge router Since the packet cannot be transferred until the user-specific information is downloaded to the spare edge router at the switching destination, the setting request of the user who sent the packet is discarded or sent to the redundancy management device. There is a problem that the time to become longer.

  The present invention has been made in view of the above points. An edge router switching method and system, an edge router, and an edge router that are capable of reducing the time during which a priority user is interrupted when switching redundant edge routers. An object is to provide a redundant management device.

According to one aspect of the present invention, when switching a redundant edge router, an edge router switching method in which a user packet arrives at a switching destination edge router and requests the user specific information from the switching destination edge router to the redundancy management device Because
The switching destination edge router is
Identify the user ID and service type of the user packet that has arrived,
Based on the user ID or the service type, reference is made to a storage means in which a user or service type to be preferentially stored is stored, and when the user ID or the service type exists in the storage means, the redundancy management An interrupt request step for making a download interrupt request for the user-specific information including the user ID to the device;
The redundancy management device is
There is provided an edge router switching method for performing a user-specific information priority transmission step of transmitting user-specific information corresponding to the user ID included in the download interrupt request to the switching destination edge router.

  According to one aspect of the present invention, priority is given to processing in which a user packet arrives at a switching destination edge router and requests user-specific information from the switching destination edge router to the redundancy management device when switching the redundant edge router. For users who use the service, even if there is a waiting for a request for user-specific information, the request can be sent earlier than the user who does not use the priority service by speeding up the request order based on the priority. The service recovery time felt by the user who uses the priority service at the time of switching can be shortened.

It is a figure which shows the operation | movement in the conventional system. It is a figure which shows the process outline | summary in one embodiment of this invention. It is an apparatus block diagram in one embodiment of this invention. It is an example of user DB in one embodiment of the present invention. It is an example of user discrimination DB in one embodiment of the present invention. It is an example of user state DB in one embodiment of the present invention. It is an example of priority service DB in one embodiment of this invention. It is an example of priority user DB in one embodiment of this invention. It is an example of the user management DB in one embodiment of the present invention. It is a sequence chart of processing in one embodiment of the present invention. It is a figure which shows the outline | summary of the process of 1st Example of this invention. It is a figure which shows the outline | summary of the process of 2nd Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing an outline of processing in one embodiment of the present invention.

  In the system shown in the figure, in a general Internet protocol (IP) network, a plurality of user terminals 10 such as user home routers and personal computers are connected to a plurality of edge routers. This is a system that transmits and receives data to and from the server of the Internet or a carrier or a user terminal of the other party.

  Active edge router 20, standby edge router 30 that relays user communications in place of the active edge router 20 when a failure occurs, and redundant management device that switches between the active edge router 20 and the standby edge router 30 40.

  An outline of the operation in the above system is shown below.

  (1) Edge switching occurs in the working edge router 20.

  (2) The user terminal 10 sends the packet to the spare edge router 30.

  (3) The backup edge router 30 analyzes the received packet and determines whether the user should be given priority and the service to be given priority.

  (4) The spare edge router 30 dynamically sets a user to be prioritized and a service to be prioritized in a database having therein.

  (5) The backup edge router 30 sends a setting request for the priority user and the priority service to the redundancy management device 40. Thereby, the redundancy management device 40 transmits the packet input port number and the user ID to the backup edge router 30 for the user to be prioritized and the service to be prioritized.

  This will be specifically described below.

  FIG. 3 is an apparatus configuration diagram according to an embodiment of the present invention.

  Although the active edge router 20 and the backup edge router 30 have the same configuration, the backup edge router 30 will be described as the service edge router 30 below.

  The service edge router 30 includes a user determination unit 31, a service recovery priority user determination unit 32, a user recovery interrupt signal transmission unit 33, a user DB 34, a user determination DB 35, a user state DB 36, a priority service DB 37, a priority user DB 38, and a transmission interval setting memory. 39.

  As shown in FIG. 4, the user DB 34 stores the user ID and user specific information acquired from the redundancy management device 40.

  As shown in FIG. 5, the user discrimination DB 35 stores the input port number of the packet and the user ID.

  As shown in FIG. 6, the user status DB 36 stores a user ID and a processing request status (for example, interrupt processing is in progress / waiting for interrupt processing). When the processing request state is “waiting for interrupt processing”, priority information (eg, 1: highest priority, 2: middle priority) is also stored.

  As shown in FIG. 7, the priority service DB 37 stores services (for example, IP telephones) and their priorities (in the example of FIG. 7, 1 is the highest priority and 2 is the medium priority).

  As shown in FIG. 8, the priority user DB 38 stores in advance a user ID and its priority (in the example of FIG. 8, 1: highest priority, 2: medium priority).

  The service recovery priority user determination unit 32 includes a packet analysis unit 321 for specifying a service from a user packet.

  The user recovery interrupt signal transmission unit 33 has a transmission queue 331.

  When a failure occurs in the working edge router 20, the redundancy management device 40 selects a switching destination edge router, changes the user's path from the working edge router 20 to the backup edge router 30, and fails. Is a device that switches to the spare edge router 30 by registering the unique information (for example, filtering policy, number of connectable sessions of PPP (Point-to-Point Protocol), etc.) registered in the switch destination router, It has a recovery interrupt signal receiving unit 41, a user management DB 42, and a user specific state transmitting unit 43.

  As shown in FIG. 9, the user management DB 42 stores a user ID, order, and setting state (“processed / setting in progress / unprocessed” in the example of FIG. 9). In addition to these items, a VLAN-ID may be stored.

  FIG. 10 is a sequence chart of processing in one embodiment of the present invention.

  Step 101) It is assumed that the user terminal 10 has transmitted a packet to the working edge router 20, but a failure has occurred in the working edge router 20.

  Step 102) Upon receiving a packet input from the user terminal 10 at the switching-destination service edge router 30 that newly functions as the active edge router when a failure occurs in the active edge router 20, the user determination unit 31 performs redundancy management. In order to make a request for user-specific information to the device 40, the user determination unit 31 acquires a user ID (VLAN-ID, MAC address, IP address, etc.) from the received packet.

  Step 103) The user determination unit 31 searches the user DB 34 based on the acquired user ID. If the user ID is registered in the user DB 34, the user determination unit 31 determines that service recovery has already been performed. If the user ID is not registered, it is determined that user-specific information is not yet registered in the service edge router 30, and the user ID and packet are transferred to the service recovery priority user determination unit 32.

  Step 104) The service recovery priority user determination unit 32 searches the user status DB 36 based on the user ID.

  Step 105) If interrupt processing is in progress, it is determined that a user recovery interrupt request has already been made, and the packet is discarded.

  Step 106) When the interrupt processing is not in progress, the priority user DB 38 is searched based on the user ID. If there is an entry, the priority for the user ID is acquired, and the user ID is sent to the user recovery interrupt signal transmission unit 33. And pass priority.

  Step 107) When the user ID does not exist in the priority user DB 38, the service recovery priority user determination unit 32 analyzes the received packet by the packet analysis unit 321, and specifies the service.

  Step 108) The service recovery priority user determination unit 32 searches the priority service DB 37 based on the specified service, and when there is an entry, obtains the priority and assigns the user ID, and proceeds to Step 110.

  Step 109) If there is no entry, the priority is set to “lowest (eg,“ 3 ”)”, the user ID is assigned, and the user recovery interrupt signal transmission unit 33 is passed.

  Step 110) The user recovery interrupt signal transmission unit 33 searches the user status DB 36 based on the user ID received from the service recovery priority user determination unit 32, the entry exists, and the processing request status is already “waiting for interrupt processing”. If it is, the priority (a) shown in the user status DB 36 is compared with the priority (b) acquired from the service recovery priority user determination unit 32. If a <b, a user recovery interrupt signal is transmitted. The old entry in the transmission queue 331 to be deleted is deleted, and the transmission queue 331 is updated to the processing order based on the priority (b). Further, the processing request status of the user ID in the user status DB 36 is overwritten with the “waiting for interrupt processing” status with priority (b).

  On the other hand, if the user recovery interrupt signal transmission unit 33 refers to the user status DB 36 based on the received user ID and there is no entry for the user ID, the user recovery interrupt signal transmission unit 33 is based on the current processing priority (b) in the transmission queue 331. The user ID is set in the processing order, and the processing request status of the user ID is additionally written in the user status DB 36 as the “waiting for interrupt processing” status at the priority (b) of the current processing.

  Step 111) Based on the transmission interval stored in the transmission interval setting memory 39, the user recovery interrupt signal transmission unit 33 acquires the transmission queue from the transmission queue 331 in descending order of priority and transmits it to the redundancy management device 40. .

  Step 112) The user recovery interrupt signal transmission unit 33 changes the processing request state of the user ID in the user state DB 36 to “interrupt processing”.

  Step 113) The user recovery interrupt signal receiver 41 of the redundancy management device 40 searches the user management DB 42 based on the user ID indicated in the received user recovery interrupt signal, and the processing state is “unprocessed”. Then, the processing state of the user management DB 42 is changed to “processed”, and the user specific information transmission unit 43 is instructed to transmit the user specific information.

  Step 114) The user specific information transmitting unit 43 transmits the specific setting information to the service edge router 30 based on the instruction from the user recovery interrupt signal receiving unit 41. Although not shown in the figure, the unique setting information is read and transmitted as registered in the redundancy management device 40.

  Step 115) The service edge router 30 transfers the packet.

  Below, it demonstrates using a specific example.

[First embodiment]
FIG. 11 shows an overview of the processing of the first embodiment of the present invention. In this embodiment, it is assumed that the VLAN-ID is stored in the user management DB 42.

  In this embodiment, a method for preferentially connecting emergency calls (110, 119) from unregistered users will be described.

  (1) The spare edge router (service edge router) 30 as the switching destination receives a user packet having an unregistered VLAN-ID from the user terminal 10.

  (2) The spare edge router 30 has the destination IP address in the IP header of the received user packet addressed to a SIP (Session Initiation Protocol) server, the request line of the SIP packet is “INVITE”, and the TO header is

でもしくは、

Or

であった場合に、当該ユーザパケットが緊急呼と判定し、送信キュー３３１に格納する。

The user packet is determined to be an emergency call and stored in the transmission queue 331.

  (3) The VLAN-ID of the user packet is extracted and transmitted to the redundancy management device 40.

  (4) In the redundancy management device 40, the user having the received VLAN-ID is searched from the user management DB 42, the user is stored in the setting waiting queue, and the user specific information is set with priority.

  (5) Transfer the stored user packet from the registered VLAN interface in the spare edge router 30 at the switching destination where the user specific information is registered.

[Second Embodiment]
FIG. 12 is a diagram showing an outline of the processing of the second embodiment of the present invention.

  In this embodiment, a method of giving priority to a specific user is shown.

  (1) The spare edge router (service edge router) 30 as the switching destination receives a user packet having an unregistered VLAN-ID from the user terminal 10.

  (2) The spare edge router 30 extracts the source IP address or VLAN-ID in the IP header of the received user packet, and if it is the address or VLAN-ID of the user to be prioritized, the priority edge router 30 The packet is determined as a user packet and stored in the transmission queue 331.

  (3) The VLAN-ID of the user packet is extracted and transmitted to the redundancy management device 40.

  (4) The redundancy management device 40 searches for a user having the received VLAN-ID, stores the user in the setting waiting queue, and preferentially sets user information.

  (5) Transfer the stored user packet from the registered VLAN interface in the spare edge router 30 at the switching destination where the user information is registered.

  As described above, it is possible to shorten the time required for user information registration at the time of switching and to shorten the service interruption time by moving forward the user information registration of the user who uses the priority service.

  Specifically, T1 is the analysis time of the packet causing the delay, T2 is the response time from sending the setting request to the redundancy management device to downloading the unique information in the prior art, and sending the setting request to the redundancy management device in the present invention. (T2−T3)> T1 can be expected when the response time required for downloading the specific information from T is T3.

  It is possible to construct the processing of the spare edge router as a program, install it on a computer used as the edge router, execute it, or distribute it via a network.

  The present invention is not limited to the above-described embodiments and examples, and various modifications and applications are possible within the scope of the claims.

10 user terminal 20 working edge router 30 backup edge router, service edge router 31 user determining unit 32 service recovery priority user determining unit 33 user recovery interrupt signal transmitting unit 34 user DB
35 User discrimination DB
36 User status DB
37 Priority Service DB
38 Priority User DB
39 Transmission interval setting memory 40 Redundancy management device 41 User recovery interrupt signal receiving unit 42 User management DB
43 User-specific information transmission unit 321 Packet analysis unit 331 Transmission queue

Claims (7)

An edge router switching method in which when a redundant edge router is switched, a user packet reaches a switching destination edge router, and the switching destination edge router requests a user-specific information to the redundancy management device.
The switching destination edge router is
Identify the user ID and service type of the user packet that has arrived,
Based on the user ID or the service type, reference is made to a storage means in which a user or service type to be preferentially stored is stored, and when the user ID or the service type exists in the storage means, the redundancy management An interrupt request step for making a download interrupt request for the user-specific information including the user ID to the device;
The redundancy management device is
A user-specific information priority transmission step of transmitting user-specific information corresponding to the user ID included in the download interrupt request to the switching destination edge router;
An edge router switching method characterized by: The storage means has a priority associated with the user ID and the service type,
In the interrupt request step,
The edge router switching method according to claim 1, wherein the download interrupt request is made for a user to be prioritized or a service to be prioritized based on a priority corresponding to the user ID or the service type. An edge router switching system for requesting user-specific information from a switching destination edge router to a redundancy management device when a user packet reaches the switching destination edge router at the time of switching the redundant edge router,
When a failure occurs in the working edge router, and switching of the edge router occurs, a user terminal that sends a user packet to the standby router for switching, and
Identifying the user ID and service type of the user packet that has arrived from the user terminal, and referring to the storage means storing the user or service type to be preferentially stored based on the user ID or the service type, When the ID or the service type exists in the storage means, a spare router having an interrupt request means for making a download interrupt request for the user-specific information including the user ID to the redundancy management device;
A redundancy management device having user specific information priority transmission means for transmitting user specific information corresponding to the user ID included in the download interrupt request from the spare router to the switching destination edge router;
An edge router switching system comprising: The storage means of the spare router has a priority associated with the user ID and the service type,
The interrupt request means is
4. The edge router switching system according to claim 3, wherein the download interrupt request is made for a user to be prioritized or a service to be prioritized based on a priority corresponding to the user ID or the service type. At the time of switching the redundant edge router, the user packet reaches the switching destination edge router, and the switching destination edge router makes a request for user specific information to the redundancy management device,
Identify the user ID and service type of the user packet arrived from the user terminal, refer to the storage means in which the user or service type to be preferentially stored is stored based on the user ID or the service type, the user ID Or an edge router comprising interrupt request means for making a download interrupt request for the user-specific information including the user ID to the redundancy management device when the service type exists in the storage means . The storage means
A user DB that stores user-specific setting information for the user ID;
A user discrimination DB that stores packet input port numbers and user IDs in association with each other;
A user status DB that stores whether or not the terminal corresponding to the user ID is being interrupted, and
Priority user DB that stores priority for user ID,
Priority service DB that stores priority for services;
Including
The interrupt request means is
User determination means for extracting the user ID from the user packet and determining whether the user ID exists in the user DB;
If it is determined by the user determination means that the user ID does not exist, the user status DB is referred to based on the user ID to determine whether interrupt processing is being performed. If interrupt processing is being performed, the user packet is discarded. If no interrupt processing is in progress, it is determined whether or not the user ID exists in the priority user DB. If the user ID exists, the priority is obtained. If the user ID does not exist, the priority is obtained based on the service of the user packet. Refers to the service DB, and if present, obtains a priority for the service, and gives service recovery priority user determination means for assigning the user ID;
User recovery interrupt signal transmission means for putting the set of the user ID and the priority obtained by the service recovery priority user determination means into a transmission queue in priority order, and transmitting the interrupt request to the redundancy management device according to the priority;
When obtaining user-specific setting information from the redundancy management device, user DB update means for storing the user ID and user-specific setting information in the user DB,
The edge router according to claim 5, comprising: When switching redundant edge routers, a user packet arrives at a switching destination edge router, obtains a request for user specific information from the switching destination edge router, and performs a user management information to the switching destination edge router. And
A user management DB that manages the processing status of whether or not the user ID, priority, and user-specific information have been set, and
When receiving an interrupt request including a user ID and the priority of user-specific information transmission from the switching destination edge router, referring to the user management DB based on the user ID, and when the processing state is unprocessed, User-specific information transmitting means for transmitting the user-specific information to the switching destination edge router;
A redundancy management device comprising:

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