WO2016206635A1

WO2016206635A1 - Lacp-based forwarding detection method and system

Info

Publication number: WO2016206635A1
Application number: PCT/CN2016/087097
Authority: WO
Inventors: 李建国
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-25
Filing date: 2016-06-24
Publication date: 2016-12-29
Also published as: CN106301871A

Abstract

A link aggregation control protocol (lacp)-based forwarding detection method and system. During the process of realizing forwarding detection of various member ports, a first switch sends a forwarding detection packet to a second switch through an lacp link; and a line card of the second switch detects a condition where a member port thereof receives the forwarding detection packet; if it is detected that the member port receiving the forwarding detection packet has timed out, the member port has gone down, and it is reported to a main control board that the port has gone down; if all member ports of the line card of the second switch have timed out, it is reported to the main control board that the lacp link goes down, and a down notification packet is also sent to other line cards of the second switch at the same time, so that the main control board controls to conduct switching processing on corresponding ports. The line card of the second switch receives the down notification packet, parses same and finds a corresponding port from a locally recorded member port list, and switches the state of the port thereof.

Description

Lacp-based forwarding detection method and system

Technical field

This document relates to but not limited to data communication technology, especially a forwarding detection method and system based on LCP (Link Aggregation Control Protocol).

Background technique

One of the functions of bidirectional forwarding detection is to provide a low-load, short-detection period failure detection method by establishing a path between adjacent forwarding engines (including interfaces, data links, and some possible extension engines). Another role is to provide an independent detection mechanism that can run on any medium at any protocol level.

There are two software implementation mechanisms for current two-way forwarding detection:

1. The centralized control method for the main control board to process all bidirectional forwarding detection messages. That is, the negotiation packet, the detection packet, and the transmission packet are all processed by the main control board. The advantage of this control method is that all messages are processed only by the main control board, supporting bidirectional forwarding detection of any Layer 3 link, including LCP-based bidirectional forwarding detection. However, it is because all the packets must pass through the main control board, and a large number of bidirectional forwarding detection packets are sent to the main control board, which causes the central processing unit (cpu, Central Processing Unit) to be too busy, resulting in each Business modules are not working properly. Although the message exchanged between the main control board and the line card is fast asynchronous message, the performance requirement of processing related message information within 10 milliseconds (ms) is still not achieved.

In order to solve the problem of the first method, the bidirectional forwarding detection implemented by the following control method is generally adopted in the related art. The specific implementation plan is as follows:

The main control board processes only the negotiation packets. After the negotiation succeeds, the line card detects the packets and sends the packets. Because the negotiation message has low real-time requirements, the requirements for real-time performance of the detection message and the transmission message are very high. Therefore, in the control processing mode, the negotiation packet is processed separately from the detection packet and the transmission packet, and the negotiation packet is processed centrally by the main control board, and the detection packet and the transmission packet are processed by a line card itself. However, with the continuous development of the communication technology, there are many member ports in the LCP-based bidirectional forwarding detection. If the link of a member port is abnormal, if the bidirectional forwarding detects the abnormal member port of the link, the Bidirectional forwarding detection false positives down (representation chain The road is blocked or abnormal.) If the two-way forwarding detection packet does not pass the abnormal member port, the two-way forwarding detection does not report the down, which causes a large number of data packets to be lost and cannot meet the performance requirements.

Therefore, in the current bicp bidirectional forwarding detection implementation, when bidirectional forwarding detection is enabled for the link of the lacp, both the bidirectional forwarding detection requirement based on the lacp link and the member link of the lacp are required. The need for bidirectional forwarding detection is realized, and the current two-way forwarding detection implementation of lacp cannot meet these two requirements, and there is currently no effective solution.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the present invention provides a method for forwarding detection based on LCP. The function of forwarding detection can be implemented on the LACP interface, and the member port of the LCP can support forwarding detection without affecting the function implementation of other member ports.

The embodiment of the invention provides a method for forwarding detection based on lacp, comprising:

The first switch negotiates with the second switch and establishes a lacp link, and the first switch periodically sends a forwarding detection packet to the second switch by using the LACP link;

The second switch detects the packet receiving status of the member port that receives the forwarding detection packet, and modifies the port status of the member port that has timed out the forwarding detection packet, and performs port switching processing.

Optionally, the step of the first switch periodically sending the forwarding detection packet to the second switch by using the LACP link includes:

Determining a member port of an active state in each line card of the first switch;

Each of the first switches of the first switch encapsulates the forwarding detection packet, and the member port whose status is active periodically sends the forwarding detection packet to the second switch.

Optionally, the step of detecting, by the second switch, the packet receiving status of the member port that receives the forwarding detection packet includes:

Receiving, by the member port of the second switch line card, the forwarding detection packet, and updating the packet receiving time of the member port;

The second switch line card determines, according to the packet receiving time of each member port, whether the packet received by the member port times out.

Optionally, the step of modifying the port status of the member port that receives the timeout of the received packet and performing the handover process includes:

When at least one member port of the second switch line card receives the forwarding detection packet, the status of the member port that has timed out is changed from active to inactive, the member port is identified as down, and the down notification of the member port is established. If the member port of the member port is reported to the other line card, the member port that has timed out is reported to the main control board to switch the member port that has timed out.

Optionally, if all the member ports of the at least one line card of the second switch receive the forwarding detection packet, the LCP link of the line card of the main control board is down.

Optionally, the line card in the second switch sends the down notification message of the member port to each of the other line cards in the second switch; the other line card parses the down notification message. The member port information that has timed out in the second switch is obtained, and the status of the line card is updated.

Optionally, after receiving the downlink packet, the other line card further includes sending to the first switch.

Optionally, after sending to the first switch, the following steps are further included:

The first switch line card parses the down advertisement packet to obtain information about a member port that has timed out in the second switch;

The first switch determines, according to the parsed member port information, a member port corresponding to the first switch, and changes the state of the member port in the first switch from active to inactive.

In the embodiment of the present invention, the down advertisement message includes: a line card mac address for sending a message, a line card mac address for receiving a message, a packet type, a length of the advertisement packet, and specific data of the member port down.

The embodiment of the present invention further provides a LACP-based forwarding detection system, including at least one first switch configured to send a forwarding detection message and at least one second switch configured to receive a forwarding detection message, the first switch Negotiating with the second switch and establishing a lacp link;

The first switch is configured to periodically send a forwarding detection packet to the second switch by using the LACP link;

The second switch is configured to detect a packet receiving condition of the member port that receives the forwarding detection packet, and modify a port state of the member port that receives the forwarding detection packet that has timed out, and perform port switching processing.

Advantageous effects of embodiments of the present invention:

The LCP-based forwarding detection method provided by the embodiment of the present invention implements the forwarding detection on the LACP interface, and ensures that each member port in the LCP can also implement forwarding detection, and the second switch line card detects the line card. If the member port of the member board receives the forwarding detection packet, if the member port is not received within the specified detection time, the physical link of the member port is abnormal and is reported to the member of the main control board. The port is down, and the down notification message of the member port is sent to other line cards of the second switch. For the member ports that are down, check whether all the member ports of the line card are timed out, or only some member ports of the line card time out. If they all time out, report the lacp link down on the main control board. If they are not timed out, they will be corresponding. The state of the member port is switched, and the abnormal member port in the lacp link is removed. The forwarding detection detection of the member port is not performed in the related art. Only when the entire lacp link is enabled, the LACP link is simultaneously implemented. The forwarding detection and the forwarding detection of the member port link can prevent the packet loss of the member port from being reported down or not down, causing packet loss, and also satisfying the lacp link to implement multiple service modules simultaneously. , thereby improving the accuracy of forwarding detection and the utilization of resources.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

FIG. 1 is a structural diagram of a packet of a line card lac notification message of a line card according to an embodiment of the present invention;

2 is a general flowchart of detecting a lacp on a line card according to an embodiment of the present invention;

3 is a flowchart of detecting a partial member port down of a lacp in a line card according to an embodiment of the present invention;

4 is a flowchart of detecting all member ports of lacp on a line card according to an embodiment of the present invention;

FIG. 5 is a flowchart of sending and receiving a transmission detection packet of a lacp according to an embodiment of the present invention.

Embodiments of the invention

In the embodiment of the present invention, in the process of implementing the LACP link interface and each member port forwarding detection, each member port sends and receives a forwarding detection packet, and detects whether the time of receiving the packet by the member port in the second switch is greater than the forwarding detection. The detection time is further reported to the main control board of the member switch in the second switch, and the switching process is performed, or the lacp link is reported, and the other line cards and the first switch of the second switch are advertised. The other line cards of the second switch and the first switch recalculate the member port entries of the second switch, and the member ports of the down node no longer send the forwarding detection message. Avoid the problem of false positives or no downs on the forwarding detection of lacp, resulting in a large number of packets being lost. The present invention will be further described in detail below by way of specific embodiments.

The detection time of the forwarding detection is a pre-configured timeout period. If the time of receiving the packet on the member port of the second switch is greater than the pre-configured timeout period, or the packet is not received within the pre-configured timeout period, The link of the member port is abnormal.

The embodiment of the present invention provides a LCP-based forwarding detection method and system, including at least one first switch configured to send a forwarding detection message and at least one second switch configured to receive a forwarding detection message, the first The switch negotiates with the second switch and establishes a lacp link;

The first switch and the second switch of the LCP-based forwarding detection system implement packet transmission by using a lacp-based forwarding detection method, and detection of link member ports of the first switch and the second switch.

Referring to FIG. 1, FIG. 1 is a structural diagram of a lacp member port down notification message according to an embodiment of the present invention. The down notification message includes: DMC (Dest Media Access Control), Source Media Access Control (SMAC), Type (TYPE), Length (LENGTH), and Data (DATA).

DMAC: Line card media access control (mac, Media Access Control) address for sending packets, a total of 6 bytes.

SMAC: The line card mac address of the received message, a total of 6 bytes.

TYPE: Packet type, two bytes, defined here as 0xeefe, indicating the type of the advertisement packet for the lcp member port down.

LENGTH: The length of the advertisement message, specifically the data length of the following DATA.

DATA: Specific data of the member port down.

FIG. 2 is a schematic flowchart of detecting LCP according to an embodiment of the present invention, in which the LCP and the member port are detected to be down, and the transmission and reception processing of the LCP forwarding detection message is detected.

The member port of each line card of the first switch periodically sends a forwarding detection packet to the corresponding member port of the second switch, and the member port corresponding to the second switch receives the forwarding detection packet, and then the second switch Detecting and finding the line card where the corresponding member port is located, determining the processing line card for forwarding the detection session, and the line card processing the received forwarding detection message again, as follows:

Step 201: Each line card of the second switch detects whether all member ports of the line card all time out. If yes, the main control board is notified that the lacp link is down, and the other line cards of the second switch are notified to update the member port status. If not, the next step 202 is performed.

Step 202: Each line card of the second switch detects whether a member port times out. If yes, the member port is abnormal, and the member ports that are reported to the main control board are down-processed, and the other line cards of the second switch are notified to update the member port status. If not, the process ends.

In an embodiment of the invention, detecting that at least one member port in the second switch line card times out. If it times out, it is advertised to the other switch of the second switch to update the member port status. Please refer to Figure 3, the process is as follows:

First, each line card of the second switch detects the status of the member port corresponding to the line card for receiving the forwarding detection message. When the receiving of the forwarding detection packet of at least one member port times out, the status of the member port that times out occurs. Change from active to inactive to identify the member port as down.

For example, in FIG. 3, for the line card 23, the forwarding detection time of the line card 23 arrives, all active member ports on the line card 23 are found, and the receiving time of each member port of the line card 23 is detected, if the line If the member port 35 of the card 23 detects the received forwarding detection packet within the detection time specified by the lacp, the member port 35 is used normally, and the next member port is continuously detected without processing. If the member port 35 of the line card 23 does not detect the received forwarding detection packet within the specified detection time, the physical link of the member port 35 of the line card 23 is abnormal, and the member port 35 is The status is updated, from active to inactive, and the main control board 12 is notified, and the member port 35 of the line card 23 is down, and the next step is performed.

Then, the line card 23 of the second switch reports the member port 35down to the main control board 12 on the switch, and performs switching processing.

For the line card 23, if it is detected that the member port of the lacp is abnormal, for example, the member port 35 of the line card 23 is down, the member port 35down of the line card 23 of the main control board 12 is reported, and the status of the member port 35 is updated, and the status is updated. The control board 12 controls switching.

Optionally, the line card 23 constructs a member port 35down to announce the message and sends it to the line card 24. The method includes: for the line card 23, if the member port 35 of the line card 23lacp is down, the member port is sent to notify the message, and the message is advertised according to the packet format group of FIG. The content of the down notification message includes: the mac address of the DMAC fill-in card 24, the mac address of the SMAC fill-in card 23, the TYPE field filled with 0xeefe, the LENGTH fills in the length of the DATA part data, and the DATA fills in the data of the member port 35down of the line card 23 .

Optionally, after the line card 24 receives the down notification message of the member port 35 of the line card 23, the line card 24 parses the information of the member port 35down of the line card 23, and performs state switching. The method includes: for the line card 24, receiving the down notification message sent by the line card 23, and parsing out the member port 35down of the line card 23, and finding the member port 35 of the line card 23 from the member port table of the local record, The status of the member port 35 of the line card 23 is changed from active to inactive.

Optionally, after the line card 24 of the second switch receives the down notification message sent by the line card 23, the line card 24 forwards the down notification message to the first switch, and then the first switch The downlink advertisement packet is parsed and the status of the corresponding member port is updated.

Finally, it is detected whether all member ports of the second switch line card are down. Including: for the line card 23, if the

member ports

35 and 36 are found to be down, in addition to reporting the port down to the main control The board 12 is configured to detect the local member port list, and all member ports are down. If yes, the main control board 12 is reported, and the lacp link is down. In the same manner, the line card 24 receives the down notification message of the line card 23, and finds that the

member ports

37 and 38 are both down, detecting whether the other member ports are all down. If yes, reporting the lacp link down on the main control board 12.

In an embodiment of the invention, it is detected whether all member ports of at least one line card of the second switch are timed out. If it times out, the main control board 12 is notified that the lacp link is down, and the other line cards of the second switch are advertised. Please refer to FIG. 4 for details, the process includes:

First, each line card of the second switch detects whether the member ports of the line card receive the forwarding detection message all times out. If all the timeouts occur, the member ports of the other line cards of the second switch are also detected. All down, if yes, and reported to the main control board and advertise other line cards, the lacp link is down. For example, for the second switch line card 23, it is detected whether the

member ports

35 and 36 on the line card 23 receive all the packets. If it is timed out, it is detected whether all the member ports of the other line cards in the second switch are down. For example, the line card 23 detects whether the member ports of the line card 24 are all down. If yes, the main control board 12 is notified that the lacp link is down. And inform other line cards to perform the next step.

Then, the line card 23 of the second switch sends a line card 23lacp link down to the main control board 12 of the switch. The step includes: for the line card 23, if the line card 23 and the other line cards of the lacp are detected, such as all the member ports of the line card 24 are down, the main control board reports that the lacp link is down.

Optionally, the second switch line card constructs a member port down advertisement packet and sends it to other line cards of the switch. For example, for the line card 23, if the member ports 35 and 6 of the lacp are down, the packet is sent according to the packet format group of FIG. The down message is specifically: the mac address of the DMAC fill-in card 24, the mac address of the SMAC fill-in card 23, the TYPE field filled with 0xeefe, the LENGTH fills in the length of the DATA part of the data, and the DATA fills in the data of the

port

35, 36.

Finally, after receiving the down notification message, the line card 24 of the second switch parses the line card 24 to find the corresponding down port and modifies the port status.

For the line card 24, the downlink notification message of the line card 23 is received, and the member ports 35 and 36down of the line card 23 are parsed. From the member port table recorded locally, the

member ports

35 and 36 of the line card 23 are found. Changed from active to inactive. The line card 24 detects whether all the member ports of the lacp are down. If yes, the line card 23 of the second switch sends a line card to the main control board 12 of the switch. 23lacp link down.

FIG. 5 is a flowchart of sending and receiving a forwarding detection packet of a LCP member port according to an embodiment of the present invention. The transmission and reception of a forwarding detection packet are clearly depicted in the figure, wherein the line card 21 sends and receives the line. Forwarding detection packet of the member port of the card. The line card 22 sends and receives the forwarding detection message of the member port of the line card; the line card 23 sends and receives the forwarding detection message of the member port of the line card; the line card 24 sends and receives the forwarding detection message of the member port of the line card. .

The process of sending a packet detection packet for each line card of the first switch includes: when the line card needs to send a forwarding detection packet, firstly, all the active member ports of the lacp local line card need to be found, for example, for the line card. The

member ports

31 and 32 are found, and the

member ports

33 and 34 are found for the line card 22; then, the packets are encapsulated according to the forwarding detection format, and are sent once for each

active member port

31 and 32 of the lacp. Similarly, the

member port

33, 34 is also sent once.

The process for receiving the packet forwarding detection packet for each line card of the second switch includes: the

member ports

35 and 36 of the line card 23 respectively receive the forwarding detection packet sent by the first switch, and the line card 23 searches for the local forwarding detection session. For the forwarding detection packet of the LCP, the forwarding detection packet received by the member port 35, the receiving time of the member port 35, the forwarding detection packet received by the member port 36, and the forwarding detection receiving time of the member port 36 are updated. The

member ports

37, 38 of the line card 24 are processed the same as the

member ports

35, 36 of the line card 23.

In the foregoing embodiment of the present invention, the first switch and the second switch are switches having the function of transmitting and forwarding detection messages, and are also switches that receive and send detection messages, and can simultaneously have the function of transmitting and forwarding detection messages and receiving. Forward the switch that detects the packet. In addition, bidirectional forwarding detection processing may also be performed between at least two switches having both a function of transmitting and forwarding detection messages and receiving a forwarding detection message. The above processing procedures are all within the scope of the present invention.

Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions for performing any of the methods described above.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by an integrated circuit to implement its corresponding function, It can be implemented in the form of a software function module, for example, by a processor executing a program/instruction in the memory and memory to implement its corresponding function. The invention is not limited to any specific form of combination of hardware and software.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

The listed technical solution avoids the false alarm of the member port or does not report the down, resulting in packet loss, and also satisfies the simultaneous use of multiple service modules of the lacp link, thereby improving the accuracy and resources of the forwarding detection. use.

Claims

A forwarding detection method based on the link aggregation control protocol lacp, comprising:

The first switch negotiates with the second switch and establishes a lacp link, and the first switch periodically sends a forwarding detection packet to the second switch by using the LACP link;

The second switch detects the packet receiving status of the member port that receives the forwarding detection packet, and modifies the port status of the member port that has timed out the forwarding detection packet, and performs port switching processing.
The LACP-based forwarding detection method according to claim 1, wherein the step of the first switch transmitting the forwarding detection packet to the second switch through the LACP link comprises:

Determining a member port of an active state in each line card of the first switch;

Each of the first switches of the first switch encapsulates the forwarding detection packet, and the member port whose status is active periodically sends the forwarding detection packet to the second switch.
The LACP-based forwarding detection method according to claim 1, wherein the step of detecting, by the second switch, the packet receiving status of the member port that receives the forwarding detection packet comprises:

Receiving, by the member switch port of the second switch line card, the forwarding detection packet, and updating the packet receiving time of the member port;

The second switch line card determines, according to the packet receiving time of each member port, whether the packet received by the member port times out.
The LCP-based forwarding detection method according to any one of claims 1 to 3, wherein the step of modifying the port state of the member port that receives the timeout of the received message and performing the handover process comprises:

When at least one member port of the second switch line card receives the forwarding detection packet, the status of the member port that has timed out is changed from active to inactive, the member port is identified as down, and the down notification of the member port is established. If the member port of the member port is reported to the other line card, the member port that has timed out is reported to the main control board to switch the member port that has timed out.
The LACP-based forwarding detection method according to claim 4, wherein if the second intersection All the member ports of at least one line card in the switch are timed out and the LCP link of the line card is down.
The LCP-based forwarding detection method of claim 4, further comprising: the line card in the second switch sending the down notification message of the member port to each of the other line cards in the second switch; The line card parses the down advertisement packet to obtain member port information that has timed out in the second switch, and updates the status of the line card.
The LCP-based forwarding detection method according to claim 6, after the other line cards receive the down message, the line card further includes sending to the first switch.
The LACP-based forwarding detection method according to claim 7, after being sent to the first switch, further comprising the following steps:

The first switch line card parses the down advertisement packet to obtain information about a member port that has timed out in the second switch;

The first switch determines, according to the parsed member port information, a member port corresponding to the first switch, and changes the state of the member port in the first switch from active to inactive.
The LCP-based forwarding detection method according to claim 4, wherein the down notification message includes: a line card medium access control mac address for sending a message, a line card mac address for receiving a message, a message type, and an advertisement. The length of the packet and the specific data of the member port down.
A forwarding detection system based on the link aggregation control protocol lacp includes at least one first switch configured to send a forwarding detection message and at least one second switch configured to receive a forwarding detection message, the first switch and the second switch Said second switch negotiates and establishes a lacp link;

The first switch is configured to periodically send a forwarding detection packet to the second switch by using the LACP link;

The second switch is configured to detect a packet receiving condition of the member port that receives the forwarding detection packet, and modify a port state of the member port that receives the forwarding detection packet that has timed out, and perform port switching processing.