CN105207817B - A kind of method that process layer devices resist network storm - Google Patents
A kind of method that process layer devices resist network storm Download PDFInfo
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Abstract
The purpose of the present invention is to provide a kind of inhibition network storm methods of process layer of digitalization transformer substation equipment, inhibit the process of storm to inhibit the process of storm to be combined with CPU using FPGA, and network storm filtering is realized using timesharing current limliting method；The FPGA inhibits the process of network storm to be：Prefilter module is arranged in FPGA, module completes cyclic redundancy check after receiving message and frame byte exclusive or code calculates, such as identical compared with the cyclic redundancy check of former frame and frame byte exclusive or code, current message is abandoned, and cyclic redundancy check and frame byte exclusive or code are preserved and judged for next frame message；It includes the process that CPU application layers inhibit the process of network storm and CPU driving layers to inhibit network storm that the CPU, which inhibits the process of storm,.This method solves process layer of digitalization transformer substation Network Abnormal and causes equipment malfunction or tripping, enhances process layer devices operational reliability.
Description
Technical field
The present invention relates to Substation Automation System field, relates in particular to a kind of process layer devices and resist network storm
Method.
Background technology
As power grid scale constantly expands the raising with automatization level, traditional substation will face compeling for intellectualized reconstruction
It is essential and asks, to adapt to the paces of intelligent grid construction in future.Process layer devices networking is one of the core of transformation, intelligent operation
Case is the source of the digital substation interval layer for following IEC61850 standards, the breaker and disconnecting link position of station level equipment,
Bay device GOOSE message is also received simultaneously, is decided whether to execute combined floodgate and trip signal according to the content of GOOSE.Intelligence
Control box GOOSE message correctly processing and its it is important, once some device network message may influence whether equipment extremely
Regular event behavior.For avoiding device malfunction or tripping, it is necessary to assure the Network Abnormal of some port does not influence device other termination
The message of mouth receives, and the Network Abnormal of some message does not influence normally receiving for other messages of same port.
And in the prior art, for the anti-network storm of process layer devices there are many different methods, be limited to CPU drivings with
FPGA (i.e. field programmable gate array) complete independently storm filters, slightly spacious after assert storm to lose all storm messages
It abandons, fails to implement effective management and control to storm after storm is assert.The present invention limits stream method effectively to resist using a kind of timesharing
The problem of process layer devices network storm, this method is low in resources consumption, simple and practicable.FPGA prefilters can effectively be resisted identical
The bump of storm, such storm do not consume cpu resource, and bandwidth will not generate any interference in the case of meeting to device.
FPGA and CPU is organically combined, and non-subscribed message is completed to abandon in driving layer, is not take up CPU storage resources, reduces using processing
Time.It subscribes to message storm to monitor in real time in application layer, timesharing is taken to storm message beyond notice driving layer after normality threshold
Current limiting measures avoid a plurality of storm of Multi-netmouth from causing error action of device or tripping to the constant impingement of CPU.
Invention content
The purpose of the present invention is to provide a kind of inhibition network storm methods of process layer of digitalization transformer substation equipment, solve
Process layer of digitalization transformer substation Network Abnormal causes equipment malfunction or tripping, enhances process layer devices operational reliability.
The purpose of the present invention can be realized by technical measures below：
A kind of method that process layer devices resist network storm inhibits the process of storm to inhibit storm with CPU using FPGA
Process be combined, using timesharing current limliting method realize network storm filtering；
A. the process of the FPGA inhibition network storm is：Prefilter module is arranged in FPGA, and module receives complete after message
It is calculated at cyclic redundancy check and frame byte exclusive or code, it is such as identical compared with the cyclic redundancy check of former frame and frame byte exclusive or code, it loses
Current message is abandoned, and cyclic redundancy check and frame byte exclusive or code are preserved and judged for next frame message；
B. it includes that CPU application layers inhibit the process of network storm and CPU driving layers to inhibit that the CPU, which inhibits the process of storm,
The process of network storm, wherein：
The CPU application layers inhibit the process of network storm to be：Application layer subscribes to the flow of message n to judge by statistics
Whether normal message flow is subscribed to, if being more than to receive threshold value (rL [n]) within the t1 times, it is believed that subscribe to message flow and then order extremely
Literary filter label of reading newspapers is enabled, and triggering driving layer message is filtered using timesharing current limliting method, and report is subscribed to after duration t2, t2
Literary filter label is reset, and is closed driving layer packet filtering, is re-started statistics；
Described judges that the whether normal foundation of the message flow subscribed to is in application layer:More than the 120% of normal discharge
More than, it is believed that there are network storms for the message of the device number, then inhibit function to carry out set network storm, enable network wind
It is sudden and violent that function, notice driving layer is inhibited to carry out current limliting processing.
The storm inhibits to enable to use timesharing current limiting measures, timesharing to open period T and powering on just in duration t2
It is set when beginningization, opening driving layer notice FPGA in period T in timesharing uploads storm message, and storm message is allowed to enter application
Layer, if device subscribes to multiframe message, only to occurring assert that the message of storm implements timesharing current limiting measures.
In the timesharing current limliting period T, the message that application layer receives carries out storm differentiation in real time, and no storm then waits for t2 to tie
Packet filtering label is subscribed to after beam to reset, and re-starts storm identification；If storm filter label is hold mode, unite again
Storm is counted to inhibit to enable the duration.
Under the timesharing current limiting measures, timesharing opens in period T, if generating storm there are many message is subscribed to, often
A timesharing, which opens, only receives a kind of storm message in period T, ensure that timesharing opens storm quantities of messages in period T and do not influencing CPU just
Normal processing function, the ability for making CPU that there is the storm message of 100% bandwidth of processing.
CPU driving layer inhibits the process of network storm to be：Read FPGA message queues application identities (APPID) and
Destination-mac address, if application identities (APPID) and destination-mac address and configuration is inconsistent, then it is assumed that be the message of non-subscribed
And FPGA is notified directly to abandon the message.If the message that storm occurs in time t2 is to subscribe to message (i.e. APPID and Destination MAC
Address is consistent with configuration) when, then under timesharing current limiting measures, only notice FPGA in period T is opened in timesharing and receive the message
And the message received is put into CPU message bufferings, other periods, then directly notice FPGA abandoned the message.No storm is normally ordered
It reads message notifying FPGA and is directly placed into CPU message bufferings.
Wherein, prefilter module described in the step A realizes FPGA filtering functions：Ethernet data is by virtual
MAC IP (MAC that the virtual IP address of FPGA is realized) flow into the prefilter module afterwards, using cyclic redundancy check and frame byte exclusive or
The adjacent identical message of the identical network interface of the equal filtering of code value.
The frame byte exclusive or code value is calculated since the destination address of frame, to cyclic redundancy check byte before include frame
Byte realizes exclusive or processing.
The FPGA extraction message destination-mac address uploads CPU with APPID, and after CPU issues control command, FPGA just will
Message is put into CPU message bufferings by DMA channel.
Advantages of the present invention and effect are：The present invention can improve the reliable of process layer devices in digital transformer substation
Property, avoid Network Abnormal from causing process layer devices malfunction and misaction.The filtering scheme is simple and effective, FPGA resource consumption
Low, CPU processing times are small, storage occupies small, and equipment quick-action performance under storm is guaranteed.Certain storm for subscribing to frame does not influence
The message for receiving, nor affecting on other ports with port others message receives, a variety of storm time-division processings for subscribing to message, different
Often do not influence each other.Storm message time-division processing ensure that storm management and control continuity after storm filtering is enabled.Cpu load is uniform,
It acts slack-off when being not in storm or malfunction and misaction occurs.The popularization and application of the present invention, greatly improve process-level network
Reliability ensures the steady safe operation of process layer devices.
Description of the drawings
Fig. 1 is the data flow figure that process layer devices receive message；
Fig. 2 is FPGA prefilter data flow figures；
Fig. 3 is driving layer filtering process figure；
Fig. 4 is application filters flow chart.
Specific implementation mode
The present invention is applied to when the arbitrary network interface of process layer devices is attacked by network storm, and influence process layer device be not dynamic
Make behavior.This method passes through the network storm effectively resisted using time division traffic method in FPGA and CPU.Realize process layer device
Arbitrary network interface does not influence device action behavior under the network storm of non-subscribed message.In the case where subscribing to message, same net is not influenced
Mouthful other subscription messages action behavior, under some network interface storm, do not influence the normal transmitting-receiving of other network interfaces.This method can
The effective management and control for realizing storm, directly applies in the process layer devices of engineer application, it is ensured that equipment reliability of operation.
The present invention is suitable for all process-level network messages, including there are many network message, the overall principles under consolidated network
It is in any network storm, the equipment message of timely isolation network storm does not influence the action of normal device and network interface
Behavior, device do not crash and restart.The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 illustrates Message processing flow of the present invention.Process layer devices use the hardware structure of FPGA+CPU, MAC
It is realized using the virtual IP address of FPGA.After Ethernet data enters FPGA, completed by MAC IP (MAC that the virtual IP address of FPGA is realized)
Message CRC check, verification flow into prefilter module by message, and being put into message queue by preposition filtering packets waits for
CPU notices upload.Whether cpu cycle operation driver inquiry FPGA message queues have message, if any message, read message
APPID and destination address such as allow the message to enter, and notice FPGA uploads message.CPU differentiates laggard in application layer progress storm
Row Message processing.
Fig. 2 illustrates the prefilter flow of FPGA prefilter modules realization, which carries out frame word after receiving message
It saves exclusive or code to calculate, and cyclic redundancy check is obtained from MAC IP, compared with the cyclic redundancy check of former frame and frame byte exclusive or code,
As identical, discarding current message, and cyclic redundancy check and frame byte exclusive or code are preserved and judged for next frame message.Preposition mistake
Filter can resist due to the exception of interchanger cause message largely repeat copy caused by network storm.Such as SV and goose messages,
Each frame has oneself counter SmpCnt or SqNum or StNum cumulative, the message of adjacent two interframe be it is different, i.e.,
2 verifications of exclusive or check value of CRC check code value and message will not be just the same.Prefilter is participated in without CPU, and FPGA is utilized
The inhibition of most storms can be realized in smaller logical resource.Message pretreatment is carried out by the message of prefilter, is carried
Message queue is squeezed into after taking out the APPID and destination-mac address of message.
Driving layer process flow is as shown in figure 3, reading MAC Address program loop and device number discriminate whether to report to subscribe to
Text, such as the message of non-subscribed, the mark will directly in dual port RAM, notice FPGA is abandoned.Message is subscribed in this way, then judges the report
Whether the storm inhibition of text enables, and is not enabled on directly notice FPGA and gives the message；If enabled, illustrate such message number as big
In threshold value, network storm is inhibited using timesharing current limliting method.In timesharing open phase, notify to give the message on FPGA, it is no
FPGA is then notified directly to abandon the message.
Application layer process flow is as shown in figure 4, CPU is timed whether inquiry has FPGA to be transmitted through in message buffering
Message needs to handle, if any then carrying out Message processing.Application program can judge that (storm inhibits tDl [n] within the t2 periods first
Duration) and t2 relationship, as tDl [n]≤t2, then tDl [n] numbers start to progressively increase and according to criterion judge whether to need into
Row timesharing opens, and opens and requires if flow is unsatisfactory for timesharing, directly by rCnt [n] and tChk [n] clearings and by packet loss；
When tDl [n] progressively increases to more than t2, application program judges the relationship of tChk [n] and t1 in turn, will if tChk [n] ＞ t1
RCnt [n] zero setting, tChk [n] are reset, and are not turned on storm and are inhibited function, directly handle message；As tChk [n]≤t1
When, tChk [n] is incremented by and rCnt [n] starts to add up, when rCnt [n] is cumulative and is more than to receive threshold value rL within the t1 times
[n] (n be receive message numbering), it is enabled to subscribe to packet filtering label, and tDl [n] resets and by packet loss；Inhibited in storm
In view of opening all network interfaces simultaneously within the t2 periods in journey, all devices number, such as at this moment all devices number have storm,
Cpu load is high, uses timesharing current limiting measures, only opens the subscription message of a number every time.Under timesharing current limiting measures,
Timesharing opens in period T, and the message that application layer receives carries out storm differentiation in real time, and report is subscribed to after the no storm t2 duration
Literary filter label is reset, and re-starts storm identification；There is the holding of storm filter label, when statistics storm inhibits enabled lasting again
Between.
When application layer DSP judges normal message, upper transmission mark is set in the message queue of the dual port RAM of FPGA,
FPGA judges that the transmission mark in message queue is holded up, LINKPORT mouthfuls using the inside for directly getting to DSP by way of DMA
The areas message buffering RAM.
The implementation of the present invention is not limited to this, under the premise of above-mentioned basic fundamental thought of the invention, according to this field
Ordinary technical knowledge and customary means make the content of present invention the modification, replacement or change of other diversified forms, all fall within
Within rights protection scope of the present invention.
Claims (8)
1. a kind of method that process layer devices resist network storm, it is characterised in that inhibit the process and CPU of storm using FPGA
Inhibit the process of storm to be combined, network storm filtering is realized using timesharing current limliting method；
A. the process of the FPGA inhibition network storm is：Prefilter module is arranged in FPGA, and module completes CRC after receiving message
Check code and frame byte exclusive or code calculate, and compared with the cyclic redundancy check of former frame and frame byte exclusive or code, such as identical, discarding is worked as
Preceding message, and cyclic redundancy check and frame byte exclusive or code are preserved and judged for next frame message；
Verification flows into prefilter module by message, and message queue waiting for CPU notice is put by preposition filtering packets
It uploads；Message pretreatment is carried out by the message of prefilter, report is squeezed into after extracting the APPID and destination-mac address of outgoing packet
Literary queue；
B. it includes that CPU application layers inhibit the process of network storm and CPU driving layers to inhibit network that the CPU, which inhibits the process of storm,
The process of storm, wherein：
The CPU application layers inhibit the process of network storm to be：Application layer subscribes to the flow of message n to judge to subscribe to by statistics
Whether message flow is normal, if being more than to receive threshold value rL [n] within the t1 times, it is believed that subscribe to message flow and then subscribe to message extremely
Filter label is enabled, and triggering driving layer message is filtered using timesharing current limliting method, and packet filtering is subscribed to after duration t2, t2
Label is reset, and is closed driving layer packet filtering, is re-started statistics；
CPU driving layer inhibits the process of network storm to be：Read the application identities APPID and target of FPGA message queues
MAC Address, if application identities APPID and destination-mac address and configuration is inconsistent, then it is assumed that be the message and notice of non-subscribed
FPGA directly abandons the message；If the message that storm occurs in time t2 is when subscribing to message, i.e. APPID and destination-mac address
When consistent with configuration, then under timesharing current limiting measures, only notice FPGA receives the message and will connect in timesharing opening period T
The message received is put into CPU message bufferings, other periods, then directly notice FPGA abandoned the message；No storm normally subscribes to message
Notice FPGA is directly placed into CPU message bufferings.
2. according to the method described in claim 1, it is characterized in that：Whether described judges the message flow subscribed in application layer
Normally foundation is:More than 120% or more of normal discharge, it is believed that there are network storms for the message of device number, will then subscribe to
Packet filtering label function carries out set, enables network storm and function, notice driving layer is inhibited to carry out current limliting processing.
3. according to the method described in claim 2, it is characterized in that：The storm inhibits to enable to use in duration t2 to divide
When current limiting measures, timesharing open period T set in power-up initializing, timesharing open period T in driving layer notice FPGA on
Storm message is passed, storm message is allowed to enter application layer, if device subscribes to multiframe message, only to occurring assert that the message of storm is real
Apply timesharing current limiting measures.
4. according to the method described in claim 1-3 any one, it is characterised in that：The timesharing opens in period T, application layer
The message of reception carries out storm differentiation in real time, and no storm is subscribed to packet filtering label after then waiting for t2 and reset, re-starts
Storm identifies；If storm filter label is hold mode, storm is counted again and inhibits to enable the duration.
5. according to the method described in claim 1-3 any one, it is characterised in that：Under the timesharing current limiting measures, timesharing
In open period T, if generating storm there are many message is subscribed to, each timesharing opens in period T and only receives a kind of storm report
Text.
6. according to the method described in claim 1-3 any one, it is characterised in that：Prefilter mould described in the step A
Block realizes FPGA filtering functions：Ethernet data flows into the prefilter module after Virtual MAC IP, using CRC check
The code identical message adjacent with the identical network interface of the equal filtering of frame byte exclusive or code value.
7. according to the method described in claim 6, it is characterized in that：The frame byte exclusive or code value is calculated from the target of frame
Location starts, to cyclic redundancy check byte before include frame byte realize exclusive or processing.
8. according to the method described in claim 1-3 any one, it is characterised in that：The FPGA extractions message Destination MAC
Location uploads CPU with APPID, and after CPU issues control command, message is just put into CPU message bufferings by FPGA by DMA channel.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106302005A (en) * | 2016-08-04 | 2017-01-04 | 国电南瑞科技股份有限公司 | The method of combining unit device dynamic monitoring IEC61850 92 network storm |
| CN106789448A (en) * | 2017-02-22 | 2017-05-31 | 许继集团有限公司 | A kind of network storm method for quick and device |
| CN107566294B (en) * | 2017-07-06 | 2021-11-05 | 中国南方电网有限责任公司 | Network storm suppression method applicable to IEC62439 standard |
| CN107835067A (en) * | 2017-11-29 | 2018-03-23 | 长园深瑞继保自动化有限公司 | GOOSE message based on programming device receives storm suppressing method |
| CN109698734B (en) * | 2019-01-30 | 2020-11-06 | 南方电网科学研究院有限责任公司 | Abnormal judgment method based on GOOSE dual-network receiving mechanism |
| CN110852903B (en) * | 2019-11-15 | 2023-01-24 | 积成电子股份有限公司 | Ladder type elastic network storm filtering method based on FPGA |
| CN111030944A (en) * | 2019-11-25 | 2020-04-17 | 杭州迪普科技股份有限公司 | Message sending method and equipment |
| CN111901356A (en) * | 2020-08-05 | 2020-11-06 | 湖南能创科技有限责任公司 | Intelligent substation process layer network storm suppression method and device and electronic equipment |
| CN116915765B (en) * | 2023-09-12 | 2023-12-05 | 福建慧政通信息科技有限公司 | File downloading management method and system |
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