CN114124801A - 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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- H04L45/00—Routing or path finding of packets in data switching networks
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Abstract
The invention provides a method, a device and a gateway device for processing redundant messages, wherein the method comprises the following steps: s1: using a vectoreveryAlgorithm algorithm specified by an IEEE802.1CB protocol to judge whether the sequence number of the received message exceeds an observation port, if so, going to step S2, otherwise, going to step S5; s2: reading the statistical number StatemA of the passing messages and the statistical number StatemB of the discarded messages, and then proceeding to step S3; s3: judging whether the difference value between StateSA and StateSB is less than or equal to the user preset value, if so, going to step S4, otherwise, discarding the message and ending the processing; s4: trusting the message, forwarding the message normally, updating the current detection serial number value of the algorithm, and finishing the processing; s5: and processing the received message according to a VectorRecoveryAlgorithm algorithm 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 label serial number interval, 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 is defined by the IEEE802.1CB protocol (frame copy and wipe), can support seamless data redundancy, and can detect and mitigate problems due to Cyclic Redundancy Check (CRC) errors, wire breaks, and loose connections. 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 the IEC62439-3 protocol are compatibly set in IEEE802.1CB, so that three tag messages, namely HSR (High-availability queue reduction), PRP (parallel reduction protocol), and R-TAG (reduction tag), can be used compatibly.
At present, HSR and PRP redundant messages defined by the IEC62439-3 protocol can only generate redundant sequence numbers according to source mac addresses and insert the redundant sequence numbers into HSR or PRP tags, so that if one source device sends unicast messages on two devices with different destination macs, if vectorrecorveryalgorithm defined by IEEE802.1CB is used, the problem of discontinuous redundant sequence numbers of the messages occurs, and if discontinuous discontinuity is too large to exceed observation width, the messages are discarded. Since this algorithm is implemented using hardware, this observation width is not set excessively large in order to save chip area.
Disclosure of Invention
In order to solve the technical problems, the invention improves the existing redundancy algorithm defined by IEEE802.1CB, and the invention is an improved chip-level time-sensitive reliable redundancy discarding algorithm, and when the vector recovery algorithm specified by IEEE802.1CB protocol is used for redundancy label messages of HSR and PRP, the invention can ensure that the messages are not discarded even under the condition that the width of an observation window does not meet the interval of label sequence numbers, thereby ensuring the robustness, stability and reliability of the algorithm.
In order to achieve the above object, the technical solution of the present invention provides a method for processing a redundant packet, which includes the following steps:
s1: using a vectoreveryAlgorithm algorithm specified by an IEEE802.1CB protocol to judge whether the sequence number of the received message exceeds an observation port, if so, going to step S2, otherwise, going to step S5;
s2: reading the statistical number StatemA of the passing messages and the statistical number StatemB of the discarded messages, and then proceeding to step S3;
s3: judging whether the difference value between StateSA and StateSB is less than or equal to the user preset value, if so, going to step S4, otherwise, discarding the message and ending the processing;
s4: trusting the message, forwarding the message normally, updating the current detection serial number value of the algorithm, and finishing the processing;
s5: and processing the received message according to a VectorRecoveryAlgorithm algorithm specified by the IEEE802.1CB protocol.
In a further aspect, step S1 includes:
s10: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s11: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and when the sequence number is not received any more within the time from the increment of 0 to 65535/2 during the full bandwidth transmission of the message, the method carries out reset.
In a further technical solution, in case there is a link disconnection, the method resets statistics of flows on the link after the link is repaired.
The technical scheme of the invention also provides gateway equipment, and the gateway equipment performs message redundancy processing by using the method.
The technical scheme of the invention also provides a redundant message processing device, which comprises:
a message sequence number interval judgment module, configured to judge, by using a vectorecoveryalalgorithm algorithm specified by the IEEE802.1CB protocol, whether a received message sequence number exceeds an observation port;
the message number counting module is used for reading the message number StatesA of the passing messages and the message number StatesB of the discarded messages in the counting state when the message serial number interval judging module judges that the message serial number exceeds the observation port;
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 less than or equal to a user preset value or not;
the message trust module is used for trusting the message, forwarding the message normally and updating the current detection serial number value of the algorithm when the message number comparison module judges that the difference value between StatesA and StatesB is less 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 StatesA and StatesB is not less than or equal to the user preset value;
and the original protocol algorithm processing module is used for processing the received message according to a vectorecovery algorithm specified by the IEEE802.1CB protocol when the message sequence number interval judgment module judges that the message sequence number does not exceed the observation port.
In a further technical scheme, the message sequence number interval judgment module judges whether the received message sequence number exceeds the observation port according to the following steps:
s20: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s21: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and when the device does not receive the trusted sequence number any more within the time that the sequence number is increased from 0 to 65535/2 during the full bandwidth transmission of the message, reset is performed.
In a further aspect, the apparatus resets statistics of flows on a link after link repair in the presence of a link disconnection.
The invention adds a checking mechanism on the original vectoreveryAlgorithm algorithm of IEEE802.1CB, thereby judging whether the message exceeding the observation width is the true message discarded because of disorder caused by delay and exceeding the observation width or the message which can not be discarded because of the condition that the message sequence number interval is caused on two devices with different purpose macs for sending the unicast message by one source device, and greatly improving the network reliability.
Drawings
FIG. 1 is a point-to-point redundant link network transmission topology;
fig. 2 is a point-to-multipoint redundant link network transmission topology;
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 vectorecoveryalgorithm algorithm specified by the IEEE802.1CB protocol.
Detailed Description
The technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Referring to fig. 1, fig. 1 is a transmission topology diagram of a point-to-point redundant link network, where a in fig. 1 is a data transmission initiator, B is a data transmission recipient, where gateways 4 and 2 are gateway devices supporting time-sensitive reliable redundancy, and gateways 1 and 3 are ordinary gateways. The message transmitted by the device A is subjected to redundancy backup through the gateway 4 based on the source mac address of the node A, the added PRP labels carry the same serial number, the same serial number is respectively copied and sent to the gateways 1 and 3 through the paths 1 and 2, when the message is forwarded to the gateway 2, the first received message is transmitted through the identification serial number, and the other received message is discarded. For this point-to-point approach, the proxy gateway 2 of the terminating node B does not receive the sequence number packet of the hop.
Referring to fig. 2, fig. 2 is a transmission topology diagram of a point-to-multipoint redundant link network, where a is a data transmission initiator and B, C is a data transmission recipient, and a message is sent to 2 terminal devices through 3 redundant links. The data transmission initiating equipment A sends two messages of different target macs, and the target macs are the 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 the PRP message label to the gateway 2 through the Path1 and the Path2, and the gateway 2 discards a redundant message through the redundant algorithm and forwards the redundant message to the device B. Similarly, device a is directed to device C (via paths 3 and 4) for redundant dropping by gateway 3. If the device a sends 100 messages with destination addresses of the device B first and the serial number is 0-99, then the device a sends 100 messages with destination addresses of the device C again and the serial number is 100-. However, it is impossible to set the reset time so short at the time of actual use.
It can be seen that, in the point-to-multipoint redundant link network transmission, the problem of discontinuous redundant sequence numbers of the messages occurs, and if the discontinuous discontinuity is too large to exceed the observation width, the messages are discarded incorrectly. Therefore, when the packet sequence number exceeding the observation port is received, it needs to further determine whether the packet exceeding the observation width is a real packet discarded due to disorder caused by delay and exceeding the observation width, or a packet that cannot be discarded due to a situation of packet sequence number interval caused by two devices with different destination macs, which are sent by one source device, is received.
Aiming at the problems, the invention provides an improved chip-level time-sensitive reliable redundancy discarding algorithm, and for the protocol-specified sequence number range of 0-65535, the invention specifies that the reset is carried out when the trusted sequence number is not received any more within the time of 65535/2 which is required to be configured. Therefore, the fact that when the difference value of the sequence numbers received before and after is large, the fact that a message with the sequence number of 1 is received and a message with the sequence number of 40000 is received is guaranteed to be avoided, only 40000 is possible to be a delay message, because if 40000 is an effective sequence message, the algorithm can reset, the sequence number is trusted, and no packet loss error is generated. This allows messages with a difference greater than 65535/2 to be guaranteed to be error free. Because if no reset is performed, it cannot be determined whether this 40000 sequence number packet is a delayed or trusted sequence number packet. The original protocol directly discards the message with delta > = frerSeqRcvyHistoryLength | | | delta < = -frerSeqRcvyHistoryLength. Here, we can process the messages with delta greater than frerSeqRcvyHistoryLength without discarding, and the message with delta < = -frerSeqRcvyHistoryLength follows the original logic. There is also a problem that if a series of messages with sequence numbers 20000-. At this time, the chip reads the number of the messages in the statistical state to judge, and finds that the passing messages and the discarded messages are equal to each other or have a very small difference value, specifically, when the difference value is less than or equal to a preset value UserDefine (the value is configured by a user and depends on an expected value of tolerance of the user to link delay), the message is regarded as a trust message. Certainly, the situation that the message does not arrive due to the open of the link end exists, at this time, the statistical values may be very different, if the backup message is in a lost state under the situation that the disconnection is not repaired, the device only receives one serial number message, and at this time, the algorithm uses the observation port to perform observation according to the original discarding algorithm logic. When the link is repaired, the statistics of the flows on the link need to be reset to ensure the reliability of the statistics. Although all possible sending situations cannot be completely avoided through the above method, for most situations, it can be ensured that the trusted message with the observation window (frerSeqRcvyHistoryLength) exceeding the difference value between the sequence numbers of the two messages before and after the observation window (frerSeqRcvyHistoryLength) is not discarded by mistake, so that the network reliability is greatly improved.
To this end, in an embodiment of the present invention, a method for processing a redundant packet is provided, and referring to fig. 3, the method may include the following steps:
s1: using a vectoreveryAlgorithm algorithm specified by an IEEE802.1CB protocol to judge whether the sequence number of the received message exceeds an observation port, if so, going to step S2, otherwise, going to step S5;
s2: reading the statistical number StatemA of the passing messages and the statistical number StatemB of the discarded messages, and then proceeding to step S3;
s3: judging whether the difference value between StateSA and StateSB is less than or equal to the user preset value, if so, going to step S4, otherwise, discarding the message and ending the processing;
s4: trusting the message, forwarding the message normally, updating the current detection serial number value of the algorithm, and finishing the processing;
s5: and processing the received message according to a VectorRecoveryAlgorithm algorithm 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 that has come in an observation window is set to 1, TakeAny represents that a sequence number of any received message is trusted or is set to 1 after initialization, and is assigned to RecovSeqNum.
In a further aspect, step S1 may include:
s10: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s11: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and when the sequence number is not received any more within the time from the increment of 0 to 65535/2 during the full bandwidth transmission of the message, the method carries out reset.
In a further technical solution, in case there is a link disconnection, the method resets statistics of flows on the link after the link is repaired.
Other embodiments of the present invention further provide a gateway device, where the gateway device performs message redundancy processing by using the method described above.
Another embodiment of the present invention further provides a redundant packet processing apparatus, which may include:
a message sequence number interval judgment module, configured to judge, by using a vectorecoveryalalgorithm algorithm specified by the IEEE802.1CB protocol, whether a received message sequence number exceeds an observation port;
the message number counting module is used for reading the message number StatesA of the passing messages and the message number StatesB of the discarded messages in the counting state when the message serial number interval judging module judges that the message serial number exceeds the observation port;
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 less than or equal to a user preset value or not;
the message trust module is used for trusting the message, forwarding the message normally and updating the current detection serial number value of the algorithm when the message number comparison module judges that the difference value between StatesA and StatesB is less 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 StatesA and StatesB is not less than or equal to the user preset value;
and the original protocol algorithm processing module is used for processing the received message according to a vectorecovery algorithm specified by the IEEE802.1CB protocol when the message sequence number interval judgment module judges that the message sequence number does not exceed the observation port.
In a further technical scheme, the message sequence number interval judgment module judges whether the received message sequence number exceeds the observation port according to the following steps:
s20: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s21: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
In a further technical scheme, the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and when the device does not receive the trusted sequence number any more within the time that the sequence number is increased from 0 to 65535/2 during the full bandwidth transmission of the message, reset is performed.
In a further aspect, the apparatus resets statistics of flows on a link after link repair in the presence of a link disconnection.
The invention adds a checking mechanism on the original vectoreveryAlgorithm algorithm of IEEE802.1CB, thereby judging whether the message exceeding the observation width is the true message discarded because of disorder caused by delay and exceeding the observation width or the message which can not be discarded because of the condition that the message sequence number interval is caused on two devices with different purpose macs for sending the unicast message by one source device, and greatly improving the network reliability.
Compared with the prior art, the invention has the beneficial technical effects that:
the redundant frames, HSR and PRP, defined by the IEEE802.1CB protocol (frame duplication and elimination) can be compatible to support IEC62439-3 protocol. By improving the vectoreveryAlgorithm algorithm defined by IEEE802.1CB, the algorithm can avoid mistakenly discarding redundant frames of macs of different purposes of the same source mac with excessively large sequence number intervals. The improved algorithm of the invention can judge whether the redundant frame with the overlarge sequence number interval is a late frame caused by delay or failure or an effective frame which is only sent to a mac with a different purpose and causes the sequence number interval. The vectoreveryAlgorithm algorithm defined by the original protocol can solve the problems by enlarging the observation port, but the range of the serial number is 0-65535, and the observation window adopts a bit mapping mode, so that 1000 bits are needed if the observation port with the range of 1000, 1000 × 2048 bits are needed if the observation port with the range of 1000K supports 2K entries, and the cost of the chip is too large. Also in practice, the range of only 1000 is not sufficient to meet the above requirements, so the actual overhead may be even larger. Therefore, the invention can save the area of the chip and ensure that the effective data frame is not mistakenly discarded by the algorithm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (9)
1. A redundant message processing method is characterized by comprising the following steps:
s1: using a vectoreveryAlgorithm algorithm specified by an IEEE802.1CB protocol to judge whether the sequence number of the received message exceeds an observation port, if so, going to step S2, otherwise, going to step S5;
s2: reading the statistical number StatemA of the passing messages and the statistical number StatemB of the discarded messages, and then proceeding to step S3;
s3: judging whether the difference value between StateSA and StateSB is less than or equal to the user preset value, if so, going to step S4, otherwise, discarding the message and ending the processing;
s4: trusting the message, forwarding the message normally, updating the current detection serial number value of the algorithm, and finishing the processing;
s5: and processing the received message according to a VectorRecoveryAlgorithm algorithm specified by the IEEE802.1CB protocol.
2. The method according to claim 1, wherein step S1 includes:
s10: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s11: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
3. The method of claim 2, wherein the sequence numbers specified by the IEEE802.1CB protocol range from 0 to 65535, and wherein the method performs reset if no more trusted sequence numbers are received within a time period from the incrementing of sequence number from 0 to 65535/2 during full bandwidth transmission of the message.
4. Method according to claim 3, characterized in that in case of a link disconnection, the method resets the statistics of flows on the link after link repair.
5. Gateway device, characterized in that it performs message redundancy handling using the method according to any of claims 1-4.
6. A redundant message processing apparatus, comprising:
a message sequence number interval judgment module, configured to judge, by using a vectorecoveryalalgorithm algorithm specified by the IEEE802.1CB protocol, whether a received message sequence number exceeds an observation port;
the message number counting module is used for reading the message number StatesA of the passing messages and the message number StatesB of the discarded messages in the counting state when the message serial number interval judging module judges that the message serial number exceeds the observation port;
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 less than or equal to a user preset value or not;
the message trust module is used for trusting the message, forwarding the message normally and updating the current detection serial number value of the algorithm when the message number comparison module judges that the difference value between StatesA and StatesB is less 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 StatesA and StatesB is not less than or equal to the user preset value;
and the original protocol algorithm processing module is used for processing the received message according to a vectorecovery algorithm specified by the IEEE802.1CB protocol when the message sequence number interval judgment module judges that the message sequence number does not exceed the observation port.
7. The apparatus of claim 6, wherein the packet sequence number interval determining module determines whether the received packet sequence number exceeds the observation port according to the following steps:
s20: calculating a difference value delta between the received message serial number and the current latest observed message serial number;
s21: whether the delta is larger than or equal to an observation port frerSeqRcvyHistoryLength set by a vector RecoveryAlgorithm algorithm is judged.
8. The apparatus of claim 7, wherein the sequence number range specified by the IEEE802.1CB protocol is 0-65535, and wherein the apparatus performs reset if the sequence number is incremented from 0 to 65535/2 during full bandwidth transmission of the packet without receiving any more trusted sequence number.
9. The apparatus of claim 8, wherein in the case of a link disconnection, the apparatus resets statistics of flows on the link after link repair.
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