CN114124801B - Redundant message processing method and device and gateway equipment - Google Patents
Redundant message processing method and device and gateway equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a redundant message processing method, a device and gateway equipment, wherein the method comprises the following steps: s1: judging whether the sequence number of the received message exceeds an observation port or not by using a vector rRaceoverAlgorithm algorithm specified by a IEEE802.1CB protocol, if so, proceeding to a step S2, otherwise, proceeding to a step S5; s2: reading the number of messages statesA of the passing message and the number of messages statesB of the discarded message in the statistical state, and then proceeding to step S3; s3: judging whether the difference value between the StatesA and the StatesB is smaller than or equal to a user preset value, if so, proceeding to step S4, otherwise, discarding the message and ending the processing; s4: trust message, normally transmit the message, and update the current detection serial number value of algorithm, and finish processing; s5: the received message is processed according to the vectortech overalgorism specified by the IEEE802.1CB protocol. The invention can still ensure that the message is not discarded by mistake even if the width of the observation window does not meet the interval of the serial numbers of the labels, thereby ensuring the robustness, stability and reliability of the algorithm.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for processing a redundant packet, and a gateway device.
Background
Time sensitive reliability, defined by the IEEE802.1CB protocol (frame copy and erasure), can support seamless data redundancy, which can detect and mitigate problems due to Cyclic Redundancy Check (CRC) errors, wire breaks, and connection looseness. The time critical data frames are extended to include a sequence number and duplicated if each frame follows a separate path in the network. At any bridge or merge point in the network, when these separate paths come together again, duplicate frames will be eliminated from the data stream, allowing the application to receive the data frames without loss. The HSR and PRP redundant messages defined by IEC62439-3 protocol are also compatible in IEEE802.1CB, so that three tag messages, namely HSR (High-availability Seamless Redundancy), PRP (Parallel Redundancy Protocol) and R-TAG (Redundancy tag), can be mutually compatible for use.
The existing HSR and PRP redundant messages defined by IEC62439-3 protocol can only generate redundant serial numbers according to source mac addresses and insert the redundant serial numbers into HSR or PRP labels, so that if one source device sends unicast messages on two devices with different destination mac, the problem of discontinuous redundant serial numbers of the messages can occur if the vector rRacceoveryAlgorithm defined by IEEE802.1CB is used, and if the discontinuous interruption exceeds the observation width too much, the message is discarded. Because this algorithm is implemented using hardware, this observation width is not set too large in order to save chip area.
Disclosure of Invention
In order to solve the technical problems, the invention improves the prior IEEE802.1CB defined redundancy algorithm, and the invention is an improved chip-level time-sensitive reliable redundancy discarding algorithm, and when the IEEE802.1CB protocol-specified Vectorreover Algorithm algorithm is used for the redundant label messages of the HSR and the PRP, the invention can ensure that the messages are not discarded even if the width of an observation window does not meet the label sequence number interval, thereby ensuring the robustness, stability and reliability of the algorithm.
In order to achieve the above object, the present invention provides a redundant message processing method, which includes the following steps:
s1: judging whether the sequence number of the received message exceeds an observation port or not by using a vector rRaceoverAlgorithm algorithm specified by a IEEE802.1CB protocol, if so, proceeding to a step S2, otherwise, proceeding to a step S5;
s2: reading the number of messages statesA of the passing message and the number of messages statesB of the discarded message in the statistical state, and then proceeding to step S3;
s3: judging whether the difference value between the StatesA and the StatesB is smaller than or equal to a user preset value, if so, proceeding to step S4, otherwise, discarding the message and ending the processing;
s4: trust message, normally transmit the message, and update the current detection serial number value of algorithm, and finish processing;
s5: the received message is processed according to the vectortech overalgorism specified by the IEEE802.1CB protocol.
In a further technical solution, step S1 includes:
s10: calculating a delta of the difference between the received message sequence number and the current latest observed message sequence number;
s11: it is determined whether delta is equal to or greater than the observation port frerSeqRcvyHistolyLength set by the Vectorecover Algorithm algorithm.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and the method performs reset when the message full bandwidth transmission sequence number increases from 0 to 65535/2 and no more trusted sequence numbers are received.
In a further technical solution, in case of a link disconnection, the method resets the statistics of the link upstream after the link repair.
The technical scheme of the invention also provides gateway equipment which performs message redundancy processing by using the method.
The technical scheme of the invention also provides a redundant message processing device, which comprises:
the message sequence number interval judging module is used for judging whether the received message sequence number exceeds an observation port or not by using a VectorRaceover Algorithm algorithm specified by a IEEE802.1CB protocol;
the message number counting module is used for reading the message number statesA of the passing message and the message number statesB of the discarded message in the counting state when the message sequence number is judged to exceed the observation port by the message sequence number interval judging module;
the message number comparison module is used for judging whether the difference value between the statesA and the statesB read by the message number statistics module is smaller than or equal to a user preset value;
the message trust module is used for trust messages, normally forwarding the messages and updating the current detection sequence number value of the algorithm when the message number comparison module judges that the difference value between the statesA and the statesB is smaller than or equal to the user preset value;
the message discarding module is used for discarding the message when the message number comparison module judges that the difference value between the statesA and the statesB is not smaller than or equal to the user preset value;
and the original protocol algorithm processing module is used for processing the received message according to the Vectorcover Algorithm algorithm specified by the IEEE802.1CB protocol when the message sequence number is judged to not exceed the observation port by the message sequence number interval judging module.
In a further technical scheme, the message sequence number interval judging module judges whether the received message sequence number exceeds an observation port according to the following steps:
s20: calculating a delta of the difference between the received message sequence number and the current latest observed message sequence number;
s21: it is determined whether delta is equal to or greater than the observation port frerSeqRcvyHistolyLength set by the Vectorecover Algorithm algorithm.
In a further technical solution, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and the device performs reset when the device no longer receives a trusted sequence number within the time period from 0 increment to 65535/2 of the full bandwidth transmission sequence number of the message.
In a further aspect, the device resets the statistics of the uplink flow after link repair in case there is a link break.
The invention adds an inspection mechanism on the original vector error coverage Algorithm of IEEE802.1CB, thereby judging whether the message exceeding the observation width is truly the message discarded because of disorder caused by delay and exceeding the observation width or the message which cannot be discarded because of the condition that two devices with different destination mac send a unicast message lead to the interval of message serial numbers, and greatly improving the network reliability.
Drawings
FIG. 1 is a topology diagram of a point-to-point redundant link network transmission;
FIG. 2 is a topology of a point-to-multipoint redundant link network transmission;
FIG. 3 is a flow chart of a redundant message processing method of the present invention;
fig. 4 is a message processing flow of the vectortech overalgorithm algorithm specified by the IEEE802.1CB protocol.
Detailed Description
The technical scheme of the present invention will be further described with reference to specific examples, but the present invention is not limited to these examples.
Referring to fig. 1, fig. 1 is a topology diagram of a point-to-point redundancy link network transmission, where a in fig. 1 is a data transmission initiating device, B is a data transmission receiving device, where gateway 4 and gateway 2 are gateway devices supporting time-sensitive reliable redundancy, and gateways 1 and 3 are ordinary gateways. The message transmitted by the equipment A is subjected to redundancy backup through the gateway 4 based on the source mac address of the node A, the PRP label is added to carry the same serial number, the message is respectively copied and transmitted to the gateways 1 and 3 through the paths Path1 and Path2, and when the message is forwarded to the gateway 2, the first received message is transmitted through the identification serial number, and the other message is discarded. For this point-to-point approach, the proxy gateway 2 of the terminal node B does not have a sequence number message of the received hop.
Referring to fig. 2, fig. 2 is a topology diagram of a point-to-multipoint redundant link network transmission, where a is a data transmission initiating device, B, C is a data transmission receiving device, and a message is sent to 2 terminal devices through 3 redundant links. The data transmission initiating equipment A sends messages of two different destination mas, wherein the destination mas are mac addresses of B and C respectively. The device A copies the redundant message through the gateway 1, adds the PRP message label and sends to the gateway 2 through the Path1 and the Path2, and the gateway 2 discards a piece of redundant message through the redundancy algorithm and forwards the redundant message to the device B. Similarly, device a sends to device C (via paths Path3 and Path 4) to make redundancy discard through gateway 3. If the device a sends 100 messages with the destination address of the device B with the sequence number of 0-99, the device a sends 100 messages with the destination address of the device C again with the sequence number of 100-199, and the processing or discarding of the redundant messages is not problematic by using the original vectoreccentri algorithm, but when the device a gives 100 messages to the device B again with the sequence number of 200-299, if the observation port is smaller than 100, the messages are discarded until a reset device is triggered, namely the sequence number of the first message accepted after the reset is trusted, and the observation window observes based on the sequence number. However, it is impossible to set the reset time so short at the time of actual use.
It can be seen that in the transmission of the point-to-multipoint redundant link network, the problem of discontinuous redundant sequence numbers of the messages occurs, and if the discontinuous interruption exceeds the observation width too much, the messages are discarded in error. Therefore, when receiving the message sequence number exceeding the observation port, it is necessary to further determine whether the message exceeding the observation width is truly a message discarded because of disorder caused by delay and exceeding the observation width, or a message which cannot be discarded because of the fact that two devices with different destination mac send a unicast message result in a message sequence number interval.
Aiming at the problems, the invention provides an improved chip-level time-sensitive reliable redundancy discarding algorithm, and for a protocol specification sequence number range of 0-65535, the invention specifies that the reset is required to be configured when the trusted sequence number is not received within 65535/2. Therefore, when the difference between the serial numbers received before and after is large, the situation that a message with the serial number of 1 is received is avoided, a message with the serial number of 40000 is received, and only 40000 is possible to be a delay message, because if 40000 is a valid serial message, an algorithm can reset and trust the serial number, and packet loss errors cannot occur. This allows messages with differences greater than 65535/2 to be guaranteed to be error-free. Because if reset is not done, it cannot be determined whether this 40000 sequence number message is a delayed or trusted sequence number message. The original protocol is directly discarded for messages delta > = frerSeqRcvyHistolyLength|delta < = -frerSeqRcvyHistolyLength. Here we can handle separately that messages with delta greater than frerSeqRcvyHistoryLength are not discarded, while messages with delta < = -frerSeqRcvyHistoryLength follow the original logic. There is also a problem that if a series of messages with sequence numbers 20000-65535,0-40000 are received, the observation window is around the sequence number 40000, and the device receives a message with sequence number 65535 again in a time when the reset is not satisfied, the message may be delayed or the message may be sent to the device again at intervals with a sequence number that needs to be trusted. At this time, the chip judges the number of the messages in the statistical state by reading, and the message passing through is found to be equal to the discarded message or the difference value is very small, specifically, when the difference value is smaller than or equal to a preset value UserDefine (the value is configured by a user and depends on the tolerance expected value of the user to the link delay), the message is considered to be a trusted message. And if the backup message is in a lost state under the condition that the disconnection is not repaired, the equipment only receives one serial number message, and the algorithm observes by using an observation port according to the original discarding algorithm logic. When the link is repaired, the statistics value of the uplink flow needs to be reset so as to ensure the credibility of the statistics value. Although all possible sending situations can not be completely avoided through the method, for most situations, the method can ensure that the trusted messages with the observation window (frerSeqRcvyHistory length) exceeding the difference value of the sequence numbers of the front message and the rear message are not discarded by mistake, so that the network reliability is greatly improved.
For this reason, in the embodiment of the present invention, a redundant message processing method is provided, referring to fig. 3, which may include the following steps:
s1: judging whether the sequence number of the received message exceeds an observation port or not by using a vector rRaceoverAlgorithm algorithm specified by a IEEE802.1CB protocol, if so, proceeding to a step S2, otherwise, proceeding to a step S5;
s2: reading the number of messages statesA of the passing message and the number of messages statesB of the discarded message in the statistical state, and then proceeding to step S3;
s3: judging whether the difference value between the StatesA and the StatesB is smaller than or equal to a user preset value, if so, proceeding to step S4, otherwise, discarding the message and ending the processing;
s4: trust message, normally transmit the message, and update the current detection serial number value of algorithm, and finish processing;
s5: the received message is processed according to the vectortech overalgorism specified by the IEEE802.1CB protocol.
Specifically, referring to fig. 4, a message processing flow of an original protocol algorithm is shown, where RecovSeqNum represents a current observed sequence code value, seqNum represents a sequence code of a received message, seqHistory [ ] identifies that a message coming in an observation window is set to 1, takeAny represents a sequence or is set to 1 after initialization, trusts a sequence number of any received message, and assigns a value to RecovSeqNum.
In a further technical solution, step S1 may include:
s10: calculating a delta of the difference between the received message sequence number and the current latest observed message sequence number;
s11: it is determined whether delta is equal to or greater than the observation port frerSeqRcvyHistolyLength set by the Vectorecover Algorithm algorithm.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and the method performs reset when the message full bandwidth transmission sequence number increases from 0 to 65535/2 and no more trusted sequence numbers are received.
In a further technical solution, in case of a link disconnection, the method resets the statistics of the link upstream after the link repair.
Other embodiments of the present invention also provide a gateway device, which performs a message redundancy process using the method described above.
The invention further provides a redundant message processing device, which may include:
the message sequence number interval judging module is used for judging whether the received message sequence number exceeds an observation port or not by using a VectorRaceover Algorithm algorithm specified by a IEEE802.1CB protocol;
the message number counting module is used for reading the message number statesA of the passing message and the message number statesB of the discarded message in the counting state when the message sequence number is judged to exceed the observation port by the message sequence number interval judging module;
the message number comparison module is used for judging whether the difference value between the statesA and the statesB read by the message number statistics module is smaller than or equal to a user preset value;
the message trust module is used for trust messages, normally forwarding the messages and updating the current detection sequence number value of the algorithm when the message number comparison module judges that the difference value between the statesA and the statesB is smaller than or equal to the user preset value;
the message discarding module is used for discarding the message when the message number comparison module judges that the difference value between the statesA and the statesB is not smaller than or equal to the user preset value;
and the original protocol algorithm processing module is used for processing the received message according to the Vectorcover Algorithm algorithm specified by the IEEE802.1CB protocol when the message sequence number is judged to not exceed the observation port by the message sequence number interval judging module.
In a further technical scheme, the message sequence number interval judging module judges whether the received message sequence number exceeds an observation port according to the following steps:
s20: calculating a delta of the difference between the received message sequence number and the current latest observed message sequence number;
s21: it is determined whether delta is equal to or greater than the observation port frerSeqRcvyHistolyLength set by the Vectorecover Algorithm algorithm.
In a further technical solution, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and the device performs reset when the device no longer receives a trusted sequence number within the time period from 0 increment to 65535/2 of the full bandwidth transmission sequence number of the message.
In a further aspect, the device resets the statistics of the uplink flow after link repair in case there is a link break.
The invention adds an inspection mechanism on the original vector error coverage Algorithm of IEEE802.1CB, thereby judging whether the message exceeding the observation width is truly the message discarded because of disorder caused by delay and exceeding the observation width or the message which cannot be discarded because of the condition that two devices with different destination mac send a unicast message lead to the interval of message serial numbers, and greatly improving the network reliability.
Compared with the prior art, the invention has the beneficial technical effects that:
defined by the IEEE802.1CB protocol (frame replication and erasure), is compatible with both HSR and PRP redundancy frames that support the IEC62439-3 protocol definition. By improving the vector rRaceoverAlgorithm algorithm defined by IEEE802.1CB, the algorithm can avoid mistaking the redundant frames of different purpose macs of the same source mac with oversized sequence number interval. The improved algorithm of the invention can judge whether the redundant frame with the oversized sequence number interval is a late frame caused by delay or fault or is a valid frame with sequence number interval caused by mac with different purposes. The vectorcross algoritm algorithm defined by the original protocol can solve the above problem by enlarging the observation port, but the range of sequence numbers is 0-65535, and the observation window adopts a bit mapping mode, so that if the observation port in the range of 1000 needs 1000 bits, if 2K entries are supported, 1000 x 2048 chips are needed for storage, and the cost for the chips is excessive. Moreover, in practical use, the range of only 1000 is not enough to meet the above requirements, so the practical overhead may be greater. Therefore, the invention can save the area of the chip and ensure that the effective data frame is not discarded by the algorithm.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present invention.
Claims (5)
1. A redundant message processing method is characterized by comprising the following steps:
s1: using a vectorcross algoritm algorithm defined by IEEE802.1CB protocol, determining whether the sequence number of the received message exceeds the observation port frerSeqRcvyHistolyLength, S1 specifically includes:
s10: calculating a difference delta between the received message sequence number and the current observation message sequence number;
s11: judging whether delta is greater than or equal to an observation port frerSeqRcvyHistolyLength set by a Vectorceover Algorithm algorithm, if so, proceeding to step S2, otherwise proceeding to step S5;
s2: reading the number of messages statesA of the passing messages of the link path1 and the number of messages statesB of the discarding messages of the link path2 in the statistical state, and then proceeding to step S3;
s3: judging whether the difference value between the StatesA and the StatesB is smaller than or equal to a user preset value, if so, proceeding to step S4, otherwise, discarding the received message and ending the processing, wherein the user preset value is a tolerance expected value of a user on link delay;
s4: trust the received message, forward the received message normally, and update the current observation message serial number value of Vectorcover Algorithm algorithm, and end the process;
s5: processing the received message according to a vector rRaceoverAlgorithm algorithm specified by a IEEE802.1CB protocol;
the IEEE802.1CB protocol specifies that the sequence number range of the received message is 0-65535, and when the trusted sequence number is not received any more in the time from 0 to 65535/2 when the full bandwidth transmission sequence number of the message is increased, the vectorradio overhead algorithm reset is performed.
2. The method of claim 1, wherein the method resets statistics of the uplink flow after link repair in the presence of a link disconnection.
3. Gateway device, characterized in that it performs a message redundancy process using the method according to claim 1 or 2.
4. A redundant message processing apparatus, comprising:
the message sequence number interval judging module is used for judging whether the received message sequence number exceeds the observation port frerSeqRcvyHistolyLength or not by using a VectorRaceoveryAlgorithm algorithm specified by a IEEE802.1CB protocol;
the message sequence number interval judging module judges whether the received message sequence number exceeds an observation port frerSeqRcvyHistolyLength according to the following steps:
s20: calculating a difference delta between the received message sequence number and the current observation message sequence number;
s21: judging whether delta is greater than or equal to an observation port frerSeqRcvyHistolyLength set by a VectorRaceoverAlgorithm algorithm;
the message number counting module is used for reading the message number StatesA of the passing message of the link path1 and the message number StatesB of the discarding message of the link path2 in a counting state when the message sequence number is judged to exceed the observation port by the message sequence number interval judging module;
the message number comparison module is used for judging whether the difference value between the statesA and the statesB read by the message number statistics module is smaller than or equal to a user preset value, wherein the user preset value is a tolerance expected value of a user on link delay;
the message trust module is used for trusting the received message, forwarding the received message normally and updating the sequence number value of the currently observed message of the VectorRoversyAlgorithm algorithm when the message number comparison module judges that the difference value between the StatesA and the StatesB is smaller than or equal to the preset value of the user;
the message discarding module is used for discarding the received message when the message number comparison module judges that the difference value between the statesA and the statesB is not smaller than or equal to the user preset value;
the original protocol algorithm processing module is used for processing the received message according to the Vectorcover Algorithm algorithm specified by the IEEE802.1CB protocol when the message sequence number is judged to not exceed the observation port by the message sequence number interval judging module;
the IEEE802.1CB protocol specifies that the sequence number range of the received message is 0-65535, and when the trusted sequence number is not received any more in the time from 0 to 65535/2 when the full bandwidth transmission sequence number of the message is increased, the vectorradio overhead algorithm reset is performed.
5. The apparatus of claim 4, wherein the apparatus resets statistics of the uplink flow after link repair if there is a link disconnection.
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