CN103716239B - The suppressing method of network storm in a kind of transformer station process layer - Google Patents
The suppressing method of network storm in a kind of transformer station process layer Download PDFInfo
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Abstract
The invention discloses the suppressing method of network storm in a kind of transformer station process layer, it is characterised in that comprise the steps: 1): mac address filter；2): big flow broadcasting packet suppression；3): use DMA0 and DMA1 of different priorities for SV message and GOOSE message, DMA0 with DMA1 is used different control strategies, it is achieved network data from MAC buffer area to processor piece in move；4): for third party's message, DMA is used to be transported to chip external memory from MAC buffer area；5): for GOOSE storm, to storm fixing in band and change storm, automatically identifying storm kind and feature, suppress storm targetedly, the network pressure reducing this network interface does not affect normal Message processing simultaneously.The method effectively inhibits broadcast storm, carries multicast storm in outer multicast storm and band, it is ensured that device can run the most reliably.
Description
Technical field
The present invention relates to the suppressing method of network storm in a kind of transformer station process layer.
Background technology
Process-level network is distinctive Internet in intelligent substation, and process layer has been used for real-time electric of operation power
Amount detection, the state parameter detection of operation equipment, operation control to perform and drive.Process layer mainly apply data be SV message,
GOOSE message data and network management traffic.Wherein sampled data (SV message), on-off state and the control of export of device
Data (GOOSE message) are all transmitted by process-level network, and this just requires that the device of intelligent substation the most all can be real-time
Respond the process-level network message subscribed to and stably send subscribed message in time.
Intelligent substation device has substantial amounts of network interface at process layer and is connected with other devices or switch, due to switch
Obstruction may cause the network storm of the property retransmitted, or the table apparatus being connected due to network interface a certain with device breaks down transmission
A large amount of network messages cause other network interfaces of this device can not correctly respond the correct message of relevant apparatus.At present in the group of process layer
Can reduce the broadcast storm impact on device by ways such as shielding broadcasting packets on network interface, existing portion of techniques achieves
Broadcast storm and the suppression of the outer multicast storm of band, the interior suppression repeating multicast storm of band, but to multicast in the band persistently changed
Storm does not still have suppressing method.
Summary of the invention
For the problems referred to above, the present invention provides the suppressing method of network storm in a kind of transformer station process layer, permissible
Effectively suppress broadcast storm, carry multicast storm in outer multicast storm and band, it is ensured that device can run the most reliably.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
The suppressing method of network storm in a kind of transformer station process layer, it is characterised in that comprise the steps:
Step 1): mac address filter: low 3 according to the SV in process-level network and GOOSE message type and MAC Address
Setting up MAC look-up table, be mapped in MAC look-up table by the MAC Address of the message subscribed to, hardware MAC realizes MAC Address mistake
Filter；
Step 2): after message arrives, the flow of broadcasting packet in message in the calculating setting time, when flow is less than broadcast wind
Receiving message during sudden and violent threshold value, otherwise broadcasting packet is carried out filtration treatment, network driver block monitored at interval of certain time
MAC relief area, separates SV message, GOOSE message and third party's message according to the characteristic area of network message；
Step 3): if SV message, set up high priority dma descriptor DMA0, and add up SV message flow, when SV reports
When literary composition flow is not more than value set in advance, update the high priority dma descriptor DMA0 of dma controller；Continue checking for MAC to delay
Rush district, when still there is SV message MAC relief area, continue to update high priority dma descriptor DMA0, when MAC relief area is the newest
SV message time, start DMA0, SV message moved the SV relief area the ram in slice of processor, DMA0 from MAC relief area
SV analyzing step is entered after end；
Step 4): if GOOSE message, set up GOOSE message descriptor in low priority dma descriptor DMA1,
And add up GOOSE message flow, when low priority DMA buffer does not has that network message and last time, DMA1 was over, start
Low priority dma descriptor DMA1, moves GOOSE message the GOOSE relief area in the ram in slice of processor, otherwise etc.
Treat that next interruption carries out GOOSE message and moves；
Step 5): if third party's message, set up third party's message in low priority dma descriptor DMA1 corresponding
Descriptor, when low priority DMA buffer does not has that network message and last time, DMA1 was over, starts low priority DMA and retouches
State symbol DMA1, third party's message is moved off-chip meshwork buffering district.
Use the DMA chain table descriptor of two different priorities, i.e. high priority dma descriptor DMA0 and low priority
Dma descriptor DMA1, wherein high priority dma descriptor DMA0 is used for moving quick SV message data, it is ensured that each interruption
SV message data can be moved completely, and the remaining time moves GOOSE message and third party to low priority dma descriptor DMA1
Message data.Use for three kinds of different network storms and process targetedly, and do not affect transmitting-receiving and the place of other messages
Reason, during to solve that in process-level network, a certain network interface has network storm, other application functions of this network interface are affected and fill
Put the problem that the function of other network interfaces is affected by.This suppressing method only filters out storm, does not affect the properly functioning of device.?
Under the conditions of 100% network load (multicast storm in band), it is mutual that device can reliably carry out network message, function normal operation.
Further, in step 4), when there is GOOSE message the GOOSE relief area in RAM, if APP ID is
Subscribed, then solve STNUM and SQNUM, and according to formula: S=a*214+b*211+c*25+ d, generator polynomial calculates eigenvalue
S determines whether duplicate message, and wherein eigenvalue S uses binary system, a be for distinguishing the network number of single double net, b be to control
Block number, c be low 5, the d of STNUM be the low 5 of SQNUM；Next GOOSE message life span is calculated, if existence week
Duplicate packages in band in phase, puts eigenvalue 1 and updates message time of advent according to eigenvalue；Abandon this GOOSE message.For
The repeating frame storm caused due to external switch reason in GOOSE message, judges solution corresponding in look-up table according to eigenvalue
Bag time and eigenvalue state, do corresponding judgement.
The invention has the beneficial effects as follows: use for three kinds of different network storms and process targetedly, and do not affect
The transmitting-receiving of other messages and process, during to solve that in process-level network, a certain network interface is affected by network storm, its of this network interface
The problem that he is affected by application function and the function of other network interfaces of device is affected by.This suppressing method only filters out wind
Cruelly, the properly functioning of device is not affected.Under the conditions of 100% network load (multicast storm in Dai), device can reliably carry out network
Message interaction, function normal operation.Effectively suppress broadcast storm, carry multicast storm in outer multicast storm and band, it is ensured that device
Can run the most reliably.
Accompanying drawing explanation
Fig. 1 is the suppression flow chart of broadcast storm of the present invention；
Fig. 2 is the General Analytical flow chart that the present invention is directed to three kinds of different network messages；
Fig. 3 is GOOSE message storm suppression flow chart in band of the present invention；
Fig. 4 is SV message storm suppression flow chart in band of the present invention.
Detailed description of the invention
With specific embodiment, technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings, so that ability
The technical staff in territory can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
Fixed.
Intelligent substation device process layer has multiple network interface, and each network interface support is issued and subscribes to polytype number
According to, there is respective application function.The present invention uses the implementation method of software and hardware combining, uses based on FPGA IP CORE hard
Part MAC and high performance BLACKFIN dsp processor, hardware MAC supports that up to 16K byte network data caches, and provides every
The length of frame network message.In order to utilize the high-performance ram in slice of DSP, DMA is used SV message and GOOSE message quickly to be removed
Move on to the way of the ram in slice of DSP.And in order to prevent SV message and GOOSE message from interacting, enable two differences preferential
The DMA of level, and dma descriptor is ordered respectively into high priority DMA chain table descriptor DMA0 and low priority DMA chain table descriptor
DMA1, wherein the priority of DMA0 is higher than DMA1.DMA0, in each poll, finds that there is SV message MAC relief area all by startup
DMA；DMA1 needs just can be again started up after starting last time, it is achieved to MAC relief area GOOSE message and third party's message
Move；In order to avoid third party's message affects the process of GOOSE message, in DMA1, third party's message is moved sheet outer net
Network relief area, prevents the network message of big flow to be full of MAC relief area, causes loss of data.A kind of transformer station process
The suppressing method of network storm in Ceng, comprises the steps: as depicted in figs. 1 and 2, and first message carries out MAC Address after arriving
Filter: hardware MAC realizes mac address filter, low 3 according to the SV in process-level network and GOOSE message type and MAC Address
Set up MAC look-up table, the MAC Address of the message subscribed to is mapped in MAC look-up table, and cache the network report of 16K byte
At MAC look-up table, literary composition, when hardware MAC receives GOOSE and SV message, judges that message is the most automatically according to low 3 of MAC
Subscribing to, then receive as subscribed to, hardware MAC realizes very MAC Address coupling and filters, can accurate filter bag according to MAC look-up table
Outer multicast message.In this step, the SV message specified according to IEC61850 and GOOSE message MAC feature and address realm
0x00-0x1ff, sets up the MAC look-up table of 2 512bit, for the ease of distinguishing, it is ordered respectively as MAC look-up table and lookup
At MAC look-up table, table, when MAC receives GOOSE message and SV message, judges that message is the most automatically according to low 3 of MAC
Subscribe to, then receive as subscribed to.
After message arrives, the flow of broadcasting packet in the calculating setting time, as it is shown in figure 1, broadcast in 10ms can be calculated
The flow of message, receives all messages when broadcasting packet flow is less than broadcast storm threshold value；When broadcasting packet flow is more than
During broadcast storm threshold value, hardware MAC presses the message after ratio filters broadcasting packet, and reading process, i.e. hardware MAC is to broadcast
Message carries out traffic statistics, when broadcasting packet flow exceedes broadcast storm threshold value set in advance, it is determined that there is broadcast wind
Cruelly, using broadcasting packet and extracted by the ratio of 1 to 16 and read, remaining message directly filters and abandons, and has both reduced broadcast
The impact of storm, also can obtain broadcasting packet simultaneously, makes service based on broadcast to be applied, such as ARP.
The every 250us of network driver block monitors a MAC relief area, according to the characteristic area of network message separate SV message,
GOOSE message and third party's message.If SV message, set up high priority DMA chain table descriptor DMA0, and add up SV message
Flow, when SV message flow is not more than SV flow threshold, wherein SV flow threshold is based on the SV flow door that CID file calculates
Sill, SV flow thresholdWherein n is that the SV that every port receives controls number of blocks, and len (i) is i
Control block message length, update the high priority DMA chain table descriptor DMA0 of dma controller, when MAC relief area still has untreated
SV message time, continue update high priority DMA chain table descriptor DMA0, when MAC relief area does not has new SV message, start
DMA0, moves the SV relief area the ram in slice of processor SV message from MAC relief area, and DMA0 enters SV after terminating and solves
Analysis step.As shown in Figure 4, when SV message flow is more than SV flow threshold, there is SV storm, SV message is put SV storm mark
Note, all of SV message in abandoning MAC relief area, produce the alarm of SV Traffic Anomaly, remind staff to take appropriate measures.
During practice, if SV message flow is beyond the 125% of this device actual SV flow, it is believed that SV message flow is abnormal, now closes
Closing the dma descriptor of SV message, when SV message flow returns to less than the 110% of actual SV message, the DMA of open SV message retouches
State symbol.
If GOOSE message, set up GOOSE message low priority DMA chain table descriptor DMA1, and at low priority
Dma descriptor DMA1 sets up GOOSE message descriptor.Statistics GOOSE message flow, updates GOOSE message descriptor and DMA
The low priority dma descriptor DMA1 of controller；When low priority DMA buffer does not has network message and DMA1 last time to tie
Shu Shi, starts low priority dma descriptor DMA1, GOOSE message is moved the GOOSE buffering in the ram in slice of processor
District.
If third party's message, i.e. neither SV message is not remaining message of GOOSE message, set up third party's report
Literary composition low priority dma descriptor DMA1, and set up, in low priority dma descriptor DMA1, the description that third party's message is corresponding
Symbol.When low priority DMA buffer does not has that network message and last time, DMA1 was over, start low priority dma descriptor
DMA1, moves off-chip meshwork buffering district third party's message.
If MAC has network message in relief area, then enter next message cycle and judge, according to untreated network report
The class area of literary composition separates SV message, GOOSE message and third party's message, is shown without in flow chart.
Use the dma descriptor of two different priorities, i.e. high priority dma descriptor DMA0 and low priority DMA retouches
Stating symbol DMA1, wherein high priority dma descriptor DMA0 is used for moving quick SV message data, it is ensured that each interruption SV message
Data can be moved completely, and the remaining time moves GOOSE message and third party's message number to low priority dma descriptor DMA1
According to.Utilize DSP that the high speed N-free diet method of ram in slice is accessed and realize rapid message process.
As it is shown on figure 3, when there is GOOSE message the GOOSE relief area in RAM, if APP ID is the most subscribed, then solve
Go out STNUM and SQNUM, and according to formula: S=a*214+b*211+c*25+ d, generator polynomial calculates eigenvalue S and judges whether
For duplicate message, wherein eigenvalue S uses binary system, a be for distinguishing the network number of single double net, b be control block number, c is
Low 5, the d of STNUM is the low 5 of SQNUM；Calculate GOOSE message life span, if repeating in the band in life cycle
Bag, it is judged that this frame is GOOSE storm frame, puts eigenvalue 1 and updates message time of advent according to eigenvalue.When judging a certain frame
During for storm frame, this frame message is not resolved, check this period whole GOOSE message flow, if GOOSE message flow
Beyond the storm threshold calculated according to ICD file, put GOOSE this GOOSE message of storm tag-and-drop, do not send out GOOSE link
Interrupting information.When GOOSE message flow is not more than the storm threshold according to the calculating of ICD file, directly abandon this GOOSE report
Literary composition.If not duplicate packages in the band in life cycle, eigenvalue is put 1 and updates message time of advent, the net being changed
Network storm judges.If the message of storage arrives in the look-up table that the eigenvalue i.e. calculated according to current GOOSE message is corresponding
Between poor with the time of advent of current message, namely life span is defaulted as 100mS at 100mS(life cycle) more than, the most not
Thinking that this frame is storm frame, this feature value corresponding states in look-up table is put 1 simultaneously, corresponding message is updated to work as the time of advent
Front message time of advent；If less than 100mS, and state corresponding to eigenvalue is 1, it is judged that this frame is storm frame, updates simultaneously
Message time of advent；If eigenvalue state is 0, eigenvalue state is put 1, update message time of advent.
When the network storm being changed judges, control block by GOOSE and add up the flow of each control block, when controlling block
Flow beyond value set in advance time, such as when the flow controlling block changes beyond this control blocks of data when 2 times of flow,
Abandon this control blocks of data, put this GOOSE message GOOSE storm labelling, process other and control blocks of data；When the flow controlling block
During without departing from value set in advance, enter GOOSE analysis program and put clearly GOOSE storm labelling.Constantly become for GOOSE message
The network storm changed, due to GOOSE message reaction is switching value information, and data variation does not act on the most frequently, permissible
Directly abandon this group message；To GOOSE message by controlling block statistic flow respectively, when a certain control block flow depends on beyond initialization
According to ICD file estimation storm threshold time, it is believed that this control block network data is storm frame, can abandon this control block number
According to, only process other and control blocks of data, when these control block network traffics drop to the 80% of threshold value, reception can be restarted
This group message.
When low priority DMA buffer does not has GOOSE message, GOOSE storm labelling clear to GOOSE message according to public affairs
Formula generator polynomial calculates eigenvalue S；Poll look-up table, is less than when the life span that eigenvalue in look-up table is corresponding is more than for 2 seconds
When 500 seconds, return again to after clear for the eigenvalue of GOOSE message 0, the most directly return.
In utilizing DSP sheet, data throughput is much larger than the feature of peripheral hardware, for different network datas, uses different preferential
The DMA of level, processes in network data is moved DSP sheet.For avoiding a certain network interface network storm to cause DSP load to increase
Add, device cisco unity malfunction, for moving the GOOSE message of ram in slice, in automatic distinguishing band, fix storm and change
Storm, identifies storm kind and feature, suppresses storm targetedly, and the network pressure reducing this network interface again can simultaneously
Receive proper network message, it is ensured that equipment reliability of operation.Wherein use for three kinds of different network storms have for
The process of property, and do not affect transmitting-receiving and the process of other messages, to solve in process-level network a certain network interface by network storm
When affecting, the problem that other application functions of this network interface are affected and the function of other network interfaces of device is affected by.This presses down
Method processed only filters out storm, does not affect the properly functioning of device.Under the conditions of 100% network load (multicast storm in Dai), dress
Put and can reliably carry out network message alternately, function normal operation.Above-mentioned storm is used to suppress way, under proper network load,
The rate of load condensate of DSP does not significantly improve, and about improves 10%, and to there being the network load of storm, then serves absolute improvement,
Substantially increase equipment service ability.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description and accompanying drawing content are made convert, or it is relevant to be directly or indirectly used in other
Technical field, be the most in like manner included in the scope of patent protection of the present invention.
Claims (6)
1. the suppressing method of network storm in a transformer station process layer, it is characterised in that comprise the steps:
Step 1): mac address filter: according to low 3 foundation of the SV in process-level network and GOOSE message type and MAC Address
MAC look-up table, is mapped to the MAC Address of the message subscribed in MAC look-up table, and hardware MAC realizes mac address filter；
Step 2): after message arrives, the flow of broadcasting packet in message in the calculating setting time, when flow is less than broadcast storm door
Receiving message during threshold value, otherwise broadcasting packet is carried out filtration treatment, network driver block monitored once at interval of certain time
MAC relief area, separates SV message, GOOSE message and third party's message according to the characteristic area of network message；
Step 3): if SV message, set up high priority dma descriptor DMA0, and add up SV message flow, when SV message flow
When amount is not more than value set in advance, update the high priority dma descriptor DMA0 of dma controller；Continue checking for MAC buffering
District, when still there is SV message MAC relief area, continues to update high priority dma descriptor DMA0, when MAC relief area does not has new
During SV message, starting DMA0, SV message is moved the SV relief area the ram in slice of processor from MAC relief area, DMA0 ties
SV analyzing step is entered after bundle；
Step 4): if GOOSE message, in low priority dma descriptor DMA1, set up GOOSE message descriptor, and unite
Meter GOOSE message flow, when low priority DMA buffer does not has that network message and last time, DMA1 was over, starts low excellent
First level dma descriptor DMA1, moves GOOSE message the GOOSE relief area in the ram in slice of processor, otherwise waits for down
Individual interruption carries out GOOSE message and moves；
Step 5): if third party's message, set up, in low priority dma descriptor DMA1, the description that third party's message is corresponding
Symbol, when low priority DMA buffer does not has that network message and last time, DMA1 was over, starts low priority dma descriptor
DMA1, moves off-chip meshwork buffering district third party's message.
The suppressing method of network storm in a kind of transformer station process layer the most according to claim 1, it is characterised in that
In step 3) in, when SV message flow is more than SV flow threshold, SV message is put SV storm labelling, abandons in MAC relief area
All of SV message, does not start high priority DMA0.
The suppressing method of network storm in a kind of transformer station process layer the most according to claim 1, it is characterised in that
In step 4) in, when there is GOOSE message the GOOSE relief area in RAM, if APPID is the most subscribed, then solve STNUM
And SQNUM, and according to formula: S=a*214+b*211+c*25+ d, generator polynomial calculates eigenvalue S and determines whether to repeat
Message, wherein eigenvalue S uses binary system, a be for distinguishing the network number of single double net, b be control block number, c is the low of STNUM
5, d be the low 5 of SQNUM；
Calculate GOOSE message life span, if duplicate packages in the band in life cycle, eigenvalue is put 1 and according to feature
Value updates message time of advent；Abandon this GOOSE message.
The suppressing method of network storm in a kind of transformer station process layer the most according to claim 3, it is characterised in that
If duplicate packages is not within life cycle in band, eigenvalue put 1 and updates message time of advent；
If message is not duplicate message, controls block by GOOSE and add up the flow of each control block, when the flow controlling block exceeds
During value set in advance, abandon this control blocks of data, put this GOOSE message GOOSE storm labelling, process other and control block number
According to.
The suppressing method of network storm in a kind of transformer station process layer the most according to claim 4, it is characterised in that
When the flow of control block is without departing from value set in advance, enters GOOSE analysis program and also put clearly GOOSE storm labelling.
The suppressing method of network storm in a kind of transformer station process layer the most according to claim 1, it is characterised in that
In step 2) in, when broadcasting packet flow is more than broadcast storm threshold value, hardware MAC is filtered out by ratio extraction broadcasting packet
Residue broadcasting packet.
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