WO2013075476A1

WO2013075476A1 - Ethernet link detection method and device

Info

Publication number: WO2013075476A1
Application number: PCT/CN2012/076852
Authority: WO
Inventors: 董晓宇
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-24
Filing date: 2012-06-13
Publication date: 2013-05-30
Also published as: CN102404171A

Abstract

Disclosed are an Ethernet link detection method and device. The method comprises: a source node sending a detection packet; a node that receives the detection packet determining whether the node is a target node; if yes, generating a response packet and returning the response packet to the source node; otherwise sending the detection packet to a next-hop node of the detection link; the source node displaying a link detection result according to the response packet. The solution of the present invention reduces the workload of the detection apparatus.

Description

Ethernet link detection method and device

The present invention relates to the field of Ethernet for communication technologies, and in particular, to an Ethernet link detection method and apparatus. Background technique

With the rapid development of Ethernet technology, the proportion of Ethernet networking in network construction is gradually increasing, and the network scale of Ethernet is also expanding. From access and aggregation to backbone networks, Ethernet is widely used instead of asynchronous transmission. Network equipment such as mode (ATM, Asynchronous Transfer Mode).

Traditional Ethernet does not have carrier-class management capabilities. It cannot detect, advertise, or quarantine Layer 2 network faults. Network management systems using the Simple Network Management Protocol (SNMP) can only manage link and device status. End-to-end connection performance and status of user services. When the network fails, it cannot be located or located quickly enough. Moreover, a large number of applications of network devices, network device managers pay more attention to the operation, management, maintenance (OAM, Operation, Administration, Maintenance) function of Ethernet devices.

Currently, the existing Ethernet OAM protocols include 802.3ah, 802.1ag, and ITU-Y1731.

802.1ag was proposed by IEEE, mainly for the management of "service" level, providing the network with easy and fast fault detection, detection and management functions. It can effectively check, isolate and report faults on virtual bridge LANs, which is an end-to-end ETH OAM standard.

802. lag's Connectivity Fault Management (CFM) protocol detects end-to-end link connectivity based on requirements through loopback and linktrace. Use loopback to detect link connectivity. If the detected link is faulty, the link cannot be confirmed. The location of the link; the linktrace is used to detect the connectivity of the link. Each intermediate node (MIP (Maintenance Association Intermediate Point) or Maintenance Association End Point (MEP)) must be the initiator of the link detection. ( MEP ) returns a reply message, notifies the media access control (MAC, Media Access Control) address of the interface, and forwards the detection message until ttl is 1 or the destination maintenance point (MP, Maintenance Point) is found. The method for detecting a link fault increases the workload of the link intermediate node. At the same time, the link detection initiator needs to process the reply message returned by each intermediate node, and records the MAC address of the intermediate node, and adds link detection. The workload of the initiator. Summary of the invention

It is an object of the present invention to provide an Ethernet link detection method and apparatus to reduce the workload of a detection device.

The present invention provides an Ethernet link detection method, the method comprising:

The source node sends a detection packet.

The node that receives the detection packet determines whether it is the destination node, and if so, generates a reply message and returns it to the source node; otherwise, the detection packet is sent to the next hop node of the detection link;

The source node displays the link detection result according to the received reply message.

The present invention also provides an Ethernet link detecting device, where the device includes a message sending and receiving module, a determining module, and a display module, where

The packet sending and receiving module is configured to send and receive the detecting message and the reply message; and when the detecting message is received and the determining module determines that the node where the node is located is the destination node, generating a reply message and sending the message to the source node; When the determining module determines that the node where the node is located is not the destination node, the detection packet is sent to the next hop node of the detection link;

The determining module is configured to determine, according to the detection packet received by the detecting packet sending and receiving module, whether the node where the node is located is a destination node; The display module is configured to display a link detection result according to the response packet received by the detection packet transceiver module.

In the present invention, the intermediate node on the detection link only needs to receive the received detection message and forward it. It is no longer necessary to return a reply message to the originating node-source node of the link detection, and only the destination node returns to the source node. Replying to the message not only reduces the number of response messages processed by the source node, but also does not need to cache the reply message; at the same time, it also reduces the workload of the intermediate node. DRAWINGS

The drawings are intended to provide a further understanding of the present invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a format of a preferred embodiment of a detection message according to the present invention;

2 is a flow chart of a preferred embodiment of the Ethernet link detection method of the present invention;

3 is a block diagram showing the principle of a preferred embodiment of the Ethernet link detecting apparatus of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments in order to make the present invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1 , it is a schematic diagram of a format of a preferred embodiment of the detection packet of the present invention. The embodiment specifically includes the following fields:

The value of the DA is the MAC address of the destination node (the end node of the detection link), which is a unicast MAC. The intermediate node on the detection link forwards the detection packet to the target node according to the value of the field.

The SA value is the MAC address of the source node (the node that initiates the link detection) and is the unicast MAC address. When the node on the link detects the detection packet, the value of the field is used as the destination MAC address, and the reply packet is sent. Give the source node; VLAN tag (Tag), which is the VLAN information in the Ethernet packet to distinguish different VLANs.

Ethernet type (Ether Type), which is an Ethernet packet type, using the Ethernet type 0x8902 of the CFM protocol;

MDL, MD Level, as defined in the CFM protocol, with a value of 0-7;

VER , version number, the same as defined in the CFM protocol;

OpCode, a custom field, is used to identify whether the packet is a packet of the current processing flow; it can be defined as a value that is not used, indicating that it is a new CFM packet;

Flags (flags) with a value of 0;

The firstTLVoffset is the same as the definition in the CFM protocol. In the present invention, the value is 6; the transaction identifier (Transaction ID) indicates that the current packet is the first packet detected by the link; ttl, the value is the timeout period; When receiving a detection packet, the node decrements the value of the field by 1; num, which is the number of nodes that pass the detection packet after it is sent; it indicates that the MAC information of several intermediate nodes has been recorded in the detection packet. The initial value is 0. When the intermediate node adds a local MAC address to the detection packet, the value is incremented by one.

MAC, the value is the MAC address of the node after the detection packet is sent; after receiving the detection packet, the intermediate node adds its own MAC address to the existing information in the field;

The endTLV is the same as the definition in the CFM protocol, indicating that the packet ends.

As shown in FIG. 2, it is a flowchart of a preferred embodiment of the Ethernet link detection method of the present invention. The embodiment specifically includes the following steps:

Step S01: The source node sends the detection packet to the next hop node on the detection link. Step S02: The node that receives the detection packet determines whether the value of the OpCode field of the detection packet is a preset detection packet identifier. Value, if yes, step S04; otherwise, otherwise, step S03;

Step S03: Forward the foregoing detection packet to the corresponding one according to the value of the OpCode field. Processing flow, the current detection message processing ends, and the process proceeds to step S02;

Step S04: determining whether the value of the ttl field of the detection packet is 1; if yes, executing step S05; otherwise, executing step S06;

Step S05: Subtracting the value of the above ttl field by 1, performing step S09;

Step S06: Determine whether it is the destination node, and if yes, execute step S09; otherwise, execute step S07; and determine whether it is the destination node.

Step S07: determining whether it is in the same maintenance set (MA, Maintenance Association) as the source node, if yes, then it is the destination node, and performing step S09; otherwise, it is not the destination node, and step S08 is performed;

Step S08: The local MAC address is filled in the MAC field of the detection packet, the value of the num field in the detection packet is incremented by 1, and the value of the ttl field is decremented by 1, and the detection packet is sent to the detection link. The next hop node, proceeds to step S02 to execute;

Step S09: Generate a reply message and return it to the source node.

In this step, the value of the DA field of the detection packet is replaced with the value of the SA field; the value of the SA field is replaced with the local MAC address; and the value of the OpCode field of the detection packet is replaced with the preset response packet. The identification value is added; the value of the num field of the above detection message is incremented by 1 to obtain a reply message.

Step S10: The source node displays the link detection result to the user according to the received reply message. As shown in FIG. 3, it is a block diagram of a preferred embodiment of the Ethernet link detecting apparatus of the present invention. The device includes a packet transceiver module 10, a judging module 20, and a display module 30, where

The packet sending and receiving module 10 is configured to send and receive a detection message and a reply message; and when the detection message is received and the determining module 20 determines that the node where the node is located is the destination node, the value of the DA field of the detection message is replaced with the SA. The value of the field, replacing the value of the SA field with the local MAC address; The value of the num field of the detection packet is incremented by one, and a response message is generated and sent to the source node. When the determining module 20 determines that the node where the node is located is not the destination node, the local MAC address is filled into the MAC address of the detection packet. In the field, the value of the num field in the detection packet is incremented by one, and the value of the ttl field is decremented by one, and the detection packet is sent to the next hop node of the detection link;

The determining module 20 is configured to determine whether the value of the OpCode field of the detection packet received by the packet receiving and receiving module 10 is a preset detection packet identifier value; determining the value of the ttl field of the detection packet to determine the same value Whether the node is a destination node; and determining whether the node where the node is located is in the same MA as the source node;

The display module 30 is configured to display a link detection result to the user according to the response packet received by the detection packet transceiver module 10.

The above description shows and describes a preferred embodiment of the present invention, but as described above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as being Other combinations, modifications, and environments are possible and can be modified by the teachings of the above teachings or related art within the scope of the inventive concept described herein. All changes and modifications made by those skilled in the art are intended to be within the scope of the appended claims.

Claims

Claim

A method for detecting an Ethernet link, the method comprising:

The source node sends a detection packet.

The node that receives the detection packet determines whether it is the destination node, and if so, generates a reply packet and returns the message to the source node; otherwise, the detection packet is sent to the next hop node of the detection link;

2. The method according to claim 1, wherein the detection message comprises the following fields:

DA, whose value is the MAC address of the destination node;

SA, which is the media access control MAC address of the source node;

OpCode, a custom field, used to identify whether the detected packet is a packet of the current processing flow; ttl, whose value is a timeout period;

Num, the value of which is the number of nodes after the detection packet is sent;

MAC, which is the MAC address of the node through which the detected message is sent.

The method according to claim 2, wherein before the node that receives the detection message determines whether it is the destination node, the method further includes:

Determining whether the value of the ttl field of the detection packet is 1, and if so, decrementing the value of the ttl field by 1, performing the step of generating the reply message and returning to the source node; otherwise, performing the determining whether the self is Is the destination node step.

The method according to claim 3, wherein, before the node that receives the detection message determines whether the value of the ttl field of the detection packet is 1, the method further includes: if yes, executing the It is determined whether the value of the ttl field of the detection packet is 1 step; otherwise, the detection packet is forwarded to the corresponding processing flow according to the value of the OpCode field.

The method according to claim 4, wherein the node that receives the detection message determines whether it is a destination node by: as a destination node.

The method according to claim 5, wherein the method further comprises: determining, by the node receiving the detection message, that the local MAC address is different from the value of the DA field of the detection packet, determining whether it is The source node is in the same maintenance set MA. If yes, it is the destination node. Otherwise, the step of sending the detection packet to the next hop node of the detection link is performed.

The method according to any one of claims 3 to 6, wherein the node that receives the detection message sends the detection message to the next hop node of the detection link, the method Also includes:

Filling the local MAC address into the MAC field of the detection packet;

Add 1 to the value of the num field in the detection message, and decrement the value of the ttl field by 1.

The method according to claim 2, wherein the generating the reply message is: replacing the value of the DA field of the detection message with the value of the SA field;

Replace the value of the SA field with the local MAC address; add 1 to the value of the num field of the detection message to obtain a reply message.

An apparatus for detecting an Ethernet link, wherein the apparatus includes a packet sending and receiving module, a determining module, and a display module, where

The packet sending and receiving module is configured to send and receive a detection message and a reply message; and when the detection message is received and the determining module determines that the node where the node is located is a destination node, generating a reply message and sending the message to the source node; When the determining module determines that the node where the node is located is not the destination node, the detection packet is sent to the next hop node of the detection link;

a determining module, configured to determine, according to the detection packet received by the detecting packet transceiver module, Whether the node in the body is the destination node;

And a display module, configured to display a link detection result according to the reply message received by the detection packet transceiver module.

10. Apparatus according to claim 9 wherein:

The packet sending and receiving module is configured to: before sending the received detection packet to the next hop node of the detection link, filling the local MAC address into the MAC field of the detection packet, and detecting the packet The value of the num field in the message is incremented by 1, and the value of the ttl field is decremented by one; and when the node where the node is located is the destination node, the value of the DA field of the detection packet is replaced with the value of the SA field; The value of the value is replaced with the local MAC address; the value of the OpCode field of the detection packet is replaced with the identifier of the preset reply message; the value of the num field of the detection packet is incremented by one; And determining whether the value of the ttl field of the detection message is 1; determining whether the location is in the same MA as the source node.