CN103716239A - Network storm inhibition method in process layer of intelligent transformer station - Google Patents
Network storm inhibition method in process layer of intelligent transformer station Download PDFInfo
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Abstract
The invention discloses a network storm inhibition method in a process layer of an intelligent transformer station. The method is characterized by comprising steps that: 1), MAC address filtering is carried out; 2), mass-flow broadcast message inhibition is carried out; 3), DMA0 and DMA1 having different priorities are used according to an SV message and a GOOSE message, and different strategies are employed for the DMA0 and the DMA1 to realize move of network data from an MAC cache region into a processor; 4), according to a third part message, move from the MAC cache region to an external memory is carried out by utilizing the DMA; and 5), according to a GOOSE storm, an in-band fixed storm and a change storm, types and characteristics of the storms can be automatically identified, and specific storm inhibition is carried out to reduce network pressure of a network port without influence exerted on normal message processing. According to the method, the broadcast storm, the out-band multicast storm and the in-band multicast storm are effectively inhibited, and correct and reliable operation of the device are guaranteed.
Description
Technical field
The present invention relates to the inhibition method of network storm in a kind of transformer station process layer.
Background technology
Process-level network is distinctive network layer in intelligent substation, and the state parameter that process layer has been used for the real-time electric parameters detection of operation power, operational outfit detects, operation is controlled and carried out and drive.The main application data of process layer is SV message, GOOSE message data and network management business.Wherein sampled data (SV message), on-off state and the control of export data (GOOSE message) of device are all transmitted by process-level network, the process-level network message that this device that just requires intelligent substation whenever all can real-time response have been subscribed to and stablely in time send subscribed message.
Intelligent substation device has a large amount of network interfaces at process layer and is connected with other devices or switch, because switch blocks the network storm may cause the property retransmitted, or because the table apparatus being connected with a certain network interface of the device a large amount of network messages of transmission that break down cause this to install the correct message that other network interfaces can not correctly respond relevant apparatus.On the networking mouth of process layer, can reduce the impact of broadcast storm on device by ways such as shielding broadcasting packets at present, existing part technology has realized the interior inhibition that repeats multicast storm of inhibition, band of broadcast storm and the outer multicast storm of band, but multicast storm in the band that continues to change is not still suppressed to method.
Summary of the invention
For the problems referred to above, the invention provides the inhibition method of network storm in a kind of transformer station process layer, can effectively suppress broadcast storm, be with multicast storm in outer multicast storm and band, assurance device can correctly move reliably.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
In transformer station process layer, an inhibition method for network storm, is characterized in that, comprises the steps:
Step 1): mac address filter: set up MAC look-up table according to the SV in process-level network and GOOSE type of message and low 3 of MAC Address, the MAC Address of the message of having subscribed to is mapped in MAC look-up table, hardware MAC realizes mac address filter;
Step 2): after message arrives, calculate the flow of broadcasting packet in the interior message of setting-up time, when being less than broadcast storm threshold value, flow receives message, otherwise broadcasting packet is carried out to filtration treatment, network-driven module monitors a MAC buffering area at interval of certain hour, according to the characteristic area of network message, separates SV message, GOOSE message and third party's message;
Step 3): if SV message is set up high priority dma descriptor DMA0, and add up SV message flow, when SV message flow is not more than predefined value, upgrade the high priority dma descriptor DMA0 of dma controller; Continue to check MAC buffering area, when MAC buffering area still has SV message, continue to upgrade high priority dma descriptor DMA0, when MAC buffering area does not have new SV message, start DMA0, SV message is moved to the SV buffering area the ram in slice of processor from MAC buffering area, after DMA0 finishes, enter SV analyzing step;
Step 4): if GOOSE message, in low priority dma descriptor DMA1, set up GOOSE message descriptor, and add up GOOSE message flow, when low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, GOOSE message is moved to the GOOSE buffering area in the ram in slice of processor, otherwise waited for that next interruption carries out GOOSE message and move;
Step 5): if third party's message, in low priority dma descriptor DMA1, set up the descriptor that third party's message is corresponding, when low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, third party's message is moved to sheet outer network buffering area.
Use the DMA chained list descriptor of two different priorities, be high priority dma descriptor DMA0 and low priority dma descriptor DMA1, wherein high priority dma descriptor DMA0 is used for moving SV message data fast, guarantee that each interrupts SV message data and can move completely, the remaining time is moved GOOSE message and third party's message data to low priority dma descriptor DMA1.For three kinds of different network storms, adopt targetedly and process, and do not affect transmitting-receiving and the processing of other messages, when solving in process-level network that a certain network interface has network storm, other application functions of this network interface are affected and install the problem that the function of other network interfaces is affected by it.This inhibition method only filters out storm, does not affect the normal operation of device.Under 100% network load (multicast storm in band) condition, 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 buffering area in RAM, if APP ID is subscribed, solve STNUM and SQNUM, and according to formula: S=a*2
14+ b*2
11+ c*2
5+ d, generator polynomial computation of characteristic values S determines whether duplicate message, wherein to adopt binary system, a be to be that controll block number, c are that low 5, the d of STNUM is the low 5 of SQNUM for distinguishing network number, the b of single two nets to characteristic value S; Next calculate GOOSE message life span, if duplicate packages in the band in life cycle, characteristic value is put to 1 and upgrade message time of advent according to characteristic value; Abandon this GOOSE message.For the repeating frame storm causing due to external switch reason in GOOSE message, according to the corresponding time that unpacks and characteristic value state in characteristic value judgement look-up table, do corresponding judgement.
The invention has the beneficial effects as follows: for three kinds of different network storms, adopt targetedly and process, and do not affect transmitting-receiving and the processing of other messages, when being subject to network storm and affecting to solve in process-level network a certain network interface, other application functions of this network interface are affected and install the problem that the function of other network interfaces is affected by it.This inhibition method only filters out storm, does not affect the normal operation of device.Under 100% network load (multicast storm in band) condition, it is mutual that device can reliably carry out network message, function normal operation.Effectively suppress broadcast storm, be with multicast storm in outer multicast storm and band, assurance device can correctly move reliably.
Accompanying drawing explanation
Fig. 1 is the inhibition 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 that in band of the present invention, GOOSE message storm suppresses flow chart;
Fig. 4 is that in band of the present invention, SV message storm suppresses flow chart.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, so that those skilled in the art can better understand the present invention also, can be implemented, but illustrated embodiment is not as a limitation of the invention.
Intelligent substation device process layer has a plurality of network interfaces, and each network interface support is issued and subscribed to polytype data, has application function separately.The present invention adopts the implementation method of software and hardware combining, adopts hardware MAC and high performance BLACKFIN dsp processor based on FPGA IP CORE, and hardware MAC supports nearly 16K byte network data buffer memory, and the length of every frame network message is provided.In order to utilize the high-performance ram in slice of DSP, adopt DMA SV message and GOOSE message to be moved fast to the way of the ram in slice of DSP.And in order to prevent that SV message and GOOSE message from interacting, enable the DMA of two different priorities, and dma descriptor is ordered respectively as high priority DMA chained list descriptor DMA0 and low priority DMA chained list descriptor DMA1, wherein the priority of DMA0 is higher than DMA1.DMA0, in each poll, finds that MAC buffering area has SV message all will start DMA; DMA1 need to could again start after starting last time, realizes moving MAC buffering area GOOSE message and third party's message; For fear of third party's message, affect the processing of GOOSE message, third party's message is moved to sheet outer network buffering area in DMA1, prevent that the network message of large flow is full of MAC buffering area, cause loss of data.A kind of inhibition method of network storm in transformer station process layer, comprise the steps: as depicted in figs. 1 and 2, first message carries out mac address filter after arriving: hardware MAC realizes mac address filter, according to the SV in process-level network and GOOSE type of message and low 3 of MAC Address, set up MAC look-up table, the MAC Address of the message of having subscribed to is mapped in MAC look-up table, and the network message of buffer memory 16K byte, when hardware MAC receives GOOSE and SV message, low 3 according to MAC judge at MAC look-up table whether message is subscribed to automatically, as subscribed to, receive, hardware MAC realizes very MAC Address coupling and filters, according to the accurate outer multicast message of filter bag of MAC look-up table.In this step, SV message and GOOSE message MAC feature and address realm 0x00-0x1ff according to IEC61850 regulation, set up the MAC look-up table of 2 512bit, for the ease of distinguishing, it is ordered respectively as MAC look-up table and look-up table, when MAC receives GOOSE message and SV message, according to low 3 of MAC, automatically at MAC look-up table, judge whether message is subscribed to, as subscribed to, receive.
After message arrives, calculate the flow of broadcasting packet in setting-up time, as shown in Figure 1, can calculate the flow of broadcasting packet in 10ms, when broadcasting packet flow is less than broadcast storm threshold value, receive all messages; When broadcasting packet flow is greater than broadcast storm threshold value, hardware MAC presses ratio filter broadcast message, and read the message after processing, be that hardware MAC carries out traffic statistics to broadcasting packet, when broadcasting packet flow surpasses predefined broadcast storm threshold value, judge and have broadcast storm, to broadcasting packet, adopt the ratio by 1 to 16 to extract and read, remaining message directly filters and abandons, both reduced the impact of broadcast storm, also can obtain broadcasting packet, the service based on broadcast can be applied, such as ARP simultaneously.
The every 250us of network-driven module monitors a MAC buffering area, according to the characteristic area of network message, separates SV message, GOOSE message and third party's message.If SV message is set up high priority DMA chained list descriptor DMA0, and added up SV message flow, when SV message flow is not more than SV flow threshold, wherein SV flow threshold is the SV flow threshold calculating according to CID file, SV flow threshold
wherein n is the SV controll block quantity that every port receives, len (i) is i controll block message length, upgrade the high priority DMA chained list descriptor DMA0 of dma controller, when MAC buffering area still has untreated SV message, continue to upgrade high priority DMA chained list descriptor DMA0, when MAC buffering area does not have new SV message, start DMA0, SV message is moved to the SV buffering area the ram in slice of processor from MAC buffering area, after DMA0 finishes, enter SV analyzing step.As shown in Figure 4, when SV message flow is greater than SV flow threshold, there is SV storm, SV message is put to SV storm mark, abandon SV messages all in MAC buffering area, produce the alarm of SV Traffic Anomaly, remind staff to take appropriate measures.During practice, if exceeding this, SV message flow installs 125% of actual SV flow, think that SV message flow is abnormal, now close the dma descriptor of SV message, until SV message flow, return to the dma descriptor of 110% open SV message when following of actual SV message.
If GOOSE message is set up GOOSE message low priority DMA chained list descriptor DMA1, and set up GOOSE message descriptor in low priority dma descriptor DMA1.Statistics GOOSE message flow, the low priority dma descriptor DMA1 of renewal GOOSE message descriptor and dma controller; When low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, GOOSE message is moved to the GOOSE buffering area in the ram in slice of processor.
If third party's message, neither SV message neither GOOSE message all the other messages, set up third party's message low priority dma descriptor DMA1, and set up the descriptor that third party's message is corresponding in low priority dma descriptor DMA1.When low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, third party's message is moved to sheet outer network buffering area.
If MAC has network message in buffering area, enter next message cycle judgement, according to the type classification of untreated network message, go out SV message, GOOSE message and third party's message, in flow chart, do not illustrate.
Use the dma descriptor of two different priorities, be high priority dma descriptor DMA0 and low priority dma descriptor DMA1, wherein high priority dma descriptor DMA0 is used for moving SV message data fast, guarantee that each interrupts SV message data and can move completely, the remaining time is moved GOOSE message and third party's message data to low priority dma descriptor DMA1.Utilize DSP to the high speed of ram in slice without etc. the rapid message that realizes to be visited process.
As shown in Figure 3, when there is GOOSE message the GOOSE buffering area in RAM, if APP ID is subscribed, solve STNUM and SQNUM, and according to formula: S=a*2
14+ b*2
11+ c*2
5+ d, generator polynomial computation of characteristic values S determines whether duplicate message, wherein to adopt binary system, a be to be that controll block number, c are that low 5, the d of STNUM is the low 5 of SQNUM for distinguishing network number, the b of single two nets to characteristic value S; Calculate GOOSE message life span, if duplicate packages in the band in life cycle judges that this frame is GOOSE storm frame, characteristic value is put to 1 and upgrade message time of advent according to characteristic value.When a certain frame of judgement is storm frame, this frame message is not resolved, check whole GOOSE message flow of this period, if GOOSE message flow exceeds the storm threshold calculating according to ICD file, put this GOOSE message of GOOSE storm tag-and-drop, do not send out GOOSE link down information.When GOOSE message flow is not more than the storm threshold calculating according to ICD file, directly abandon this GOOSE message.If not duplicate packages in the band in life cycle, characteristic value is put to 1 and upgrade message time of advent, the network storm changing judgement.If poor according to the time of advent of the message time of advent of storing in look-up table corresponding to the characteristic value of current GOOSE message calculating and current message, namely life span is defaulted as 100mS life cycle at 100mS() more than, do not think that this frame is storm frame, simultaneously this characteristic value corresponding states in look-up table is put to 1, the message of correspondence is updated to current message time of advent the time of advent; If be less than 100mS, and state corresponding to characteristic value be 1, judges that this frame is storm frame, upgrades message time of advent simultaneously; If characteristic value state is 0, characteristic value state is put to 1, upgrade message time of advent.
When the network storm judgement changing, by GOOSE controll block, add up the flow of each controll block, when the flow of controll block exceeds predefined value, while exceeding this controll block data variation such as the flow when controll block 2 times of flow time, abandon this controll block data, put this GOOSE message GOOSE storm mark, process other controll block data; When the flow of controll block does not exceed predefined value, enter GOOSE analysis program and put clearly GOOSE storm mark.The network storm constantly changing for GOOSE message, due to the reaction of GOOSE message be switching value information, not effect of data variation too frequently, can directly abandon this group message; GOOSE message is pressed to controll block statistic flow respectively, when a certain controll block flow exceeds initialization according to the storm threshold of ICD file estimation, think that this controll block network data is storm frame, can abandon this controll block data, only process other controll block data, until these controll block network traffics drop to threshold value 80% time, can restart and receive this group message.
When low priority DMA buffering area does not have GOOSE message, to GOOSE message clear GOOSE storm mark and according to formula generator polynomial computation of characteristic values S; Poll look-up table, when life span corresponding to characteristic value is greater than 2 seconds and is less than 500 seconds in look-up table, will return after the characteristic value of GOOSE message clear 0 again, otherwise directly return.
Utilize data throughput in DSP sheet much larger than the feature of peripheral hardware, for different network datas, to use the DMA of different priorities, network data is moved in DSP sheet and processed.For avoiding a certain network interface network storm to cause DSP load to increase, device cisco unity malfunction, for the GOOSE message of moving ram in slice, the interior fixedly storm of automatic distinguishing band and variation storm, identification storm kind and feature, targetedly storm is suppressed, the network pressure that reduces this network interface can receive proper network message again simultaneously, has guaranteed equipment reliability of operation.Wherein for three kinds of different network storms, adopt targetedly and process, and do not affect transmitting-receiving and the processing of other messages, when being subject to network storm and affecting to solve in process-level network a certain network interface, other application functions of this network interface are affected and install the problem that the function of other network interfaces is affected by it.This inhibition method only filters out storm, does not affect the normal operation of device.Under 100% network load (multicast storm in band) condition, it is mutual that device can reliably carry out network message, function normal operation.Adopt above-mentioned storm to suppress way, under proper network load, the load factor of DSP is not significantly improved, and approximately improves 10%, and to there being the network load of storm, has played absolute improvement, has greatly improved equipment serviceability.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. an inhibition method for network storm in transformer station process layer, is characterized in that, comprises the steps:
Step 1): mac address filter: set up MAC look-up table according to the SV in process-level network and GOOSE type of message and low 3 of MAC Address, the MAC Address of the message of having subscribed to is mapped in MAC look-up table, hardware MAC realizes mac address filter;
Step 2): after message arrives, calculate the flow of broadcasting packet in the interior message of setting-up time, when being less than broadcast storm threshold value, flow receives message, otherwise broadcasting packet is carried out to filtration treatment, network-driven module monitors a MAC buffering area at interval of certain hour, according to the characteristic area of network message, separates SV message, GOOSE message and third party's message;
Step 3): if SV message is set up high priority dma descriptor DMA0, and add up SV message flow, when SV message flow is not more than predefined value, upgrade the high priority dma descriptor DMA0 of dma controller; Continue to check MAC buffering area, when MAC buffering area still has SV message, continue to upgrade high priority dma descriptor DMA0, when MAC buffering area does not have new SV message, start DMA0, SV message is moved to the SV buffering area the ram in slice of processor from MAC buffering area, after DMA0 finishes, enter SV analyzing step;
Step 4): if GOOSE message, in low priority dma descriptor DMA1, set up GOOSE message descriptor, and add up GOOSE message flow, when low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, GOOSE message is moved to the GOOSE buffering area in the ram in slice of processor, otherwise waited for that next interruption carries out GOOSE message and move;
Step 5): if third party's message, in low priority dma descriptor DMA1, set up the descriptor that third party's message is corresponding, when low priority DMA buffering area does not have that network message and last time, DMA1 finished, start low priority dma descriptor DMA1, third party's message is moved to sheet outer network buffering area.
2. the inhibition method of network storm in a kind of transformer station process layer according to claim 1, it is characterized in that, in step 3), when SV message flow is greater than SV flow threshold, SV message is put to SV storm mark, abandon SV messages all in MAC buffering area, do not start high priority DMA0.
3. the inhibition method of network storm in a kind of transformer station process layer according to claim 1, is characterized in that, in step 4), when there is GOOSE message the GOOSE buffering area in RAM, if APPID is subscribed, solve STNUM and SQNUM, and according to formula: S=a*2
14+ b*2
11+ c*2
5+ d, generator polynomial computation of characteristic values S determines whether duplicate message, wherein to adopt binary system, a be to be that controll block number, c are that low 5, the d of STNUM is the low 5 of SQNUM for distinguishing network number, the b of single two nets to characteristic value S;
Calculate GOOSE message life span, if duplicate packages in the band in life cycle, characteristic value is put to 1 and upgrade message time of advent according to characteristic value; Abandon this GOOSE message.
4. the inhibition method of network storm in a kind of transformer station process layer according to claim 3, is characterized in that, if duplicate packages is not within life cycle in band, characteristic value is put to 1 and upgrade message time of advent;
If message is not duplicate message, by GOOSE controll block, add up the flow of each controll block, when the flow of controll block exceeds predefined value, abandon this controll block data, put this GOOSE message GOOSE storm mark, process other controll block data.
5. the inhibition method of network storm in a kind of transformer station process layer according to claim 4, is characterized in that, when the flow of controll block does not exceed predefined value, enters GOOSE analysis program and puts clearly GOOSE storm mark.
6. the inhibition method of network storm in a kind of transformer station process layer according to claim 1, it is characterized in that, in step 4), when GOOSE buffering area does not have GOOSE message, to GOOSE message clear GOOSE storm mark and according to formula generator polynomial computation of characteristic values S; Poll look-up table, when life span corresponding to characteristic value is greater than 2 seconds and is less than 500 seconds in look-up table, will return after the characteristic value of GOOSE message clear 0 again, otherwise directly return.
7. the inhibition method of network storm in a kind of transformer station process layer according to claim 1, it is characterized in that, in step 2) in, when broadcasting packet flow is greater than broadcast storm threshold value, hardware MAC extracts broadcasting packet by ratio and filters out residue broadcasting packet.
8. the inhibition method of network storm in a kind of transformer station process layer according to claim 1, it is characterized in that, in step 1), SV message and GOOSE message MAC feature and address realm 0x00-0x1ff according to IEC61850 regulation, set up the MAC look-up table of 2 512bit, when hardware MAC receives GOOSE message and SV message, according to low 3 of MAC, automatically at MAC look-up table, judge whether message is subscribed to, as subscribed to, receive.
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