WO2018024189A1

WO2018024189A1 - Loopback detection method and apparatus

Info

Publication number: WO2018024189A1
Application number: PCT/CN2017/095399
Authority: WO
Inventors: 肖敏; 张征; 王翠; 魏月华
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-08-01
Filing date: 2017-08-01
Publication date: 2018-02-08
Also published as: CN107682214A; CN107682214B

Abstract

A loopback detection method and apparatus. The method comprises: receiving a loopback detection packet, the loopback detection packet carrying a target media access control (MAC) address, the target MAC address being a multicast MAC address (S202); determining, according to the target MAC address, whether to terminate the loopback detection packet (S204); and if the determining result is yes, terminating the loopback detection packet (S206).

Description

Loopback detection method and device

Technical field

This document relates to, but is not limited to, the field of communications, and in particular to a loopback detection method and apparatus.

Background technique

In the current Ethernet network, the Institute of Electrical and Electronics Engineers (IEEE) has developed a set of operations for Ethernet operation, management and maintenance (OAM). The mechanism was officially released as the 802.1ag standard in 2007.

The IEEE 802.1ag standard defines the OAM function logical entity in Ethernet, including the Maintenance End Point (MEP) located at both ends of the Ethernet transmission path, and the Maintenance Intermediate Point located in the middle of the Ethernet transmission path (Maintenance Intermediate Point). , referred to as MIP). The maintenance endpoint and the maintenance intermediate point are collectively referred to as the Maintenance Point (MP). The maintenance point in the Ethernet is based on the port of the network node. The Media Access Control (MAC) address of the port is the MAC address of the maintenance point created based on the port. Loopback detection is one of the Ethernet OAM functions defined by the IEEE 802.1ag standard. This function runs from MEP to MEP or MEP to MIP. The purpose is to detect the failure of the entire or a period of Ethernet transmission path, where the Ethernet transmission path is faulty. It includes both the failure of the link between the network nodes and the forwarding failure of the network node.

The IEEE 802.1ag standard provides a loopback detection mechanism based on MAC forwarding. Figure 1 is a schematic diagram of a loopback detection mechanism based on MAC forwarding. As shown in Figure 1, switch 1 and switch 4 create one MEP and one. MIP, Switch 2 and Switch 3 are created with two MIPs. The loopback detection process from MEP1 to MIP5 includes the following steps:

Step 1: After the network operator enters the address of the MIP5 and starts the loopback detection function of the MEP1 to the MIP5, the MEP1 sends a loopback detection packet with the MIP5 address as the destination MAC address to the MIP5, and the packet is transmitted along the MAC forwarding-based transmission. The path arrives at MIP5.

Step 2: After receiving the loopback detection packet and detecting the error, the MIP5 replies to the loopback response packet to the MEP1 that sends the packet.

Step 3: After receiving the loopback response message replied by the MIP5 and detecting the error, the MEP1 returns a report of the loopback detection success to the network operator.

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 loopback detection method and device, which can implement a loopback detection packet in a multicast mode by a MIP.

According to an embodiment of the present invention, a loopback detection method is provided, including: receiving a loopback detection message, where the loopback detection message carries a destination media access control MAC address, the destination MAC address The address is a multicast MAC address. The loopback detection packet is terminated according to the destination MAC address. If the judgment result is yes, the loopback detection packet is terminated.

Optionally, determining whether to terminate the loopback detection message according to the destination MAC address includes: inverting a bit used to indicate unicast or multicast in the destination MAC address, to obtain a unicast MAC address; If the unicast MAC address is consistent with the stored maintenance intermediate MIP address, the loopback detection packet is determined to be terminated.

Optionally, the terminating the loopback detection packet includes: forwarding the loopback detection packet to a MIP corresponding to the MIP address that is consistent with the obtained unicast MAC address; and ending the loopback detection report by the MIP Text.

Optionally, after determining, according to the destination MAC address, whether to terminate the loopback detection packet, the method further includes: if the determination result is negative, detecting the group carried in the packet according to the loopback The broadcast information forwards the loopback detection message.

Optionally, the multicast information includes: a bit index display copy BIER tag and a bit mask.

Optionally, the destination MAC address is a multicast MAC address obtained by inverting a unicast or multicast bit in the MIP address of the destination maintenance intermediate point of the loopback detection.

According to another embodiment of the present invention, there is provided a loopback detecting apparatus comprising: a receiving mode The block is configured to receive a loopback detection message, where the loopback detection message carries a destination media access control MAC address, the destination MAC address is a multicast MAC address, and the determining module is configured to be configured according to the The destination MAC address is used to determine whether to terminate the loopback detection packet. The termination module is configured to terminate the loopback detection packet if the determination result is yes.

Optionally, the determining module includes: a reversing unit, configured to invert a bit used to indicate unicast or multicast in the destination MAC address, to obtain a unicast MAC address, and a determining unit, configured to If the unicast MAC address is consistent with the stored maintenance intermediate MIP address, it is determined that the loopback detection packet is terminated.

Optionally, the terminating module includes: a forwarding unit, configured to forward the loopback detection message to a MIP corresponding to a MIP address that is consistent with the obtained unicast MAC address; and the terminating unit is configured to be terminated by the MIP The loopback detection packet.

Optionally, the device further includes: a forwarding module, configured to forward the loopback detection packet according to the multicast information carried in the loopback detection packet if the determination result is negative.

Optionally, the multicast information includes: a BIER tag and a bit mask.

According to another embodiment of the present invention, there is provided a loopback detecting apparatus comprising: a first port and a processing chip, wherein the first port is connected to the processing chip; and the first port is configured as a receiving ring a back detection packet, wherein the loopback detection packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address; and the processing chip is configured to determine whether the destination MAC address is used according to the destination MAC address. The loopback detection packet is terminated; if the judgment result is yes, the loopback detection packet is terminated.

Optionally, the apparatus further comprises: a memory, wherein the memory is connected to the processing chip, and the memory is configured to store a MIP address of the configured MIP.

Optionally, the processing chip is configured to: invert the bit used to indicate unicast or multicast in the destination MAC address, to obtain a unicast MAC address, and determine the obtained unicast MAC address and the memory storage. Whether the MIP address is consistent; if it is determined that the obtained unicast MAC address is consistent with the stored MIP address, it is determined to terminate the loopback detection message.

Optionally, the device further includes: one or more MIPs, wherein the one or more MIPs are connected to the processing chip; and the processing chip is configured to forward the loopback detection message to and Obtaining a MIP corresponding to the MIP address with the same unicast MAC address; indicating that the corresponding MIP terminates the loopback detection packet; and the corresponding MIP is configured to terminate the loopback detection report according to the indication of the processing chip Text.

Optionally, the device further includes: a second port, wherein the second port is connected to the processing chip; and the processing chip is further configured to: when it is determined that the loopback detection message is not terminated And the second port is configured to forward the loopback detection packet according to the destination MAC address, and the second port is configured to send the loopback detection packet according to the indication of the processing chip.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is configured to store a program code for performing the following steps: receiving a loopback detection message, wherein the loopback detection message carries a destination media access control MAC address, and the destination MAC address is multicast The MAC address is determined according to the destination MAC address, and the loopback detection packet is terminated. If the determination result is yes, the loopback detection packet is terminated.

Optionally, the storage medium is further configured to store program code for performing the following steps: inverting a bit in the destination MAC address for indicating unicast or multicast, to obtain a unicast MAC address; in the unicast If the MAC address is consistent with the stored maintenance intermediate MIP address, the loopback detection packet is determined to be terminated.

In the embodiment of the present invention, when the destination MAC address carried in the received loopback detection packet is a multicast MAC address, it is determined whether the loopback detection packet is terminated according to the multicast MAC address, and the determination result is yes. In this case, the loopback detection packet is terminated. Therefore, the loopback detection packet of the multicast mode terminated by the MIP can be implemented.

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

BRIEF abstract

1 is a schematic diagram of a loopback detection mechanism based on MAC forwarding;

2 is a flow chart of a loopback detection method according to an embodiment of the present invention;

3 is a structural block diagram 1 of a loopback detecting apparatus according to an embodiment of the present invention;

4 is a structural block diagram 2 of a loopback detecting apparatus according to an embodiment of the present invention;

FIG. 5 is a structural block diagram 3 of a loopback detecting apparatus according to an embodiment of the present invention; FIG.

6 is a structural block diagram 4 of a loopback detecting apparatus according to an embodiment of the present invention;

FIG. 7 is a structural block diagram 1 of another loopback detecting apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a structural block diagram 2 of another loopback detecting apparatus according to an embodiment of the present invention; FIG.

9 is a structural block diagram 3 of another loopback detecting apparatus according to an embodiment of the present invention;

FIG. 10 is a structural block diagram 4 of another loopback detecting apparatus according to an embodiment of the present invention; FIG.

11 is a schematic diagram of a MAC address format in accordance with an alternative embodiment of the present invention;

12 is a schematic diagram of a BIER-based loopback detection method in accordance with an alternative embodiment of the present invention.

Embodiments of the invention

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

US Patent Application US2015078380 (Bit Indexed Explicit Replication For Layer 2 Networking) discloses an Ethernet frame multicast method based on Bit Indexed Explicit Replication (BIER). The method is: defining a BIER tag and a bit mask in the frame header of the Ethernet frame. First, the network edge node encapsulates the BIER tag and the bit mask into the frame header of the Ethernet frame entering the network. Then, the network node forwards the multicast Ethernet frame based on the BIER tag carrying the bit mask. Specifically, the network node stores two independent forwarding tables of a MAC forwarding table and a BIER forwarding table, which are respectively used for unicast Ethernet frame forwarding and multicast Ethernet frame forwarding, wherein the MAC forwarding table is used for unicasting. The forwarding of the Ethernet frame, the BIER forwarding table is used for forwarding the multicast Ethernet frame. For the Ethernet frame that needs to be forwarded, the network node extracts the destination MAC address of the Ethernet frame and the BIER tag. When the destination MAC address of the Ethernet frame is a unicast MAC address, the BIER tag is ignored, and the MAC forwarding table is searched according to the destination MAC address and forwarded according to the MAC address. The mechanism forwards the packet. When the destination MAC address of the Ethernet frame is the multicast MAC address, the destination MAC address is ignored. The BIER forwarding table is searched according to the BIER label and the packet is forwarded according to the forwarding mechanism of the BIER.

When the loopback detection function is applied to the transmission path based on the BIER forwarding, the application scenario of the loopback detection of the MEP to the MEP can be implemented. However, for the application scenario of the loopback detection of the MEP to the MIP, the intermediate node of the transmission path is configured. The MIP cannot terminate the loopback detection message based on the BIER forwarding.

In this embodiment, a loopback detection method is provided. FIG. 2 is a flowchart of a loopback detection method according to an embodiment of the present invention. As shown in FIG. 2, the flow includes the following steps:

Step S202: Receive a loopback detection packet, where the loopback detection packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address.

Step S204: Determine, according to the destination MAC address, whether to terminate the loopback detection packet;

In step S206, if the determination result is yes, the loopback detection message is terminated.

The loopback detection packet is received by the loopback detection packet, where the loopback detection packet carries the destination medium access control MAC address, and the destination MAC address is a multicast MAC address; and the destination MAC address is used to determine whether to terminate the loopback detection packet. When the judgment result is yes, the loopback detection message is terminated. When the destination MAC address carried in the received loopback detection packet is a multicast MAC address, it is determined whether the loopback detection packet is terminated according to the multicast MAC address, and if the judgment result is yes, the loopback is terminated. Detect the message. Therefore, the loopback detection packet of the multicast mode terminated by the MIP can be implemented.

Optionally, the execution entity of the foregoing step may be a network node, including: a switch.

Optionally, in the foregoing step S204, the unicast MAC address is obtained, and the unicast MAC address is compared with the stored MIP address to determine whether to terminate the loopback detection packet. For example, the unicast MAC address is used to indicate the unicast or multicast bit in the destination MAC address. When the unicast MAC address is consistent with the stored maintenance intermediate MIP address, the final loopback detection report is determined. Text.

Optionally, in the foregoing step S206, the MIP termination loopback detection packet of the MIP address and the unicast MAC address in the switch configured with the MIP may be used. For example: turn the loopback detection message The MIP corresponding to the MIP address that matches the obtained unicast MAC address is detected by the MIP termination loopback packet.

Optionally, after the step S204, if the loopback detection packet is not terminated, the loopback detection packet is further forwarded. For example, if the judgment result is negative, the loopback detection packet is forwarded according to the multicast information carried in the loopback detection packet.

Optionally, the multicast information may include: a bit index display copy BIER tag and a bit mask.

Optionally, the destination MAC address may include a multicast MAC address used to indicate unicast or multicast bit inversion in the destination maintenance intermediate point MIP address of the loopback detection.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

In this embodiment, a loopback detection device is further provided, which is used to implement the above-mentioned embodiments and optional embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 3 is a structural block diagram 1 of a loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes:

The receiving module 32 is configured to receive a loopback detection packet, where the loopback detection packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address.

The determining module 34 is coupled to the receiving module 32, and configured to determine, according to the destination MAC address, whether to terminate the loopback detection message;

The termination module 36 is coupled to the determination module 34 and configured to terminate the loopback detection message if the determination result is yes.

The receiving module receives the loopback detection packet, where the loopback detection packet carries the destination medium access control MAC address, and the destination MAC address is a multicast MAC address; the determining module determines whether to terminate the ring according to the destination MAC address. The detection packet is returned. The termination module terminates the loopback detection packet if the judgment result is yes. When the destination MAC address carried in the received loopback detection packet is a multicast MAC address, it is determined whether the loopback detection packet is terminated according to the multicast MAC address, and if the judgment result is yes, the loopback is terminated. Detect the message. Therefore, the loopback detection packet of the multicast mode terminated by the MIP can be implemented.

4 is a block diagram 2 of a loopback detection apparatus according to an embodiment of the present invention. As shown in FIG. 4, optionally, the apparatus includes, in addition to all the modules shown in FIG.

The inverting unit 42 is configured to invert the bit used to indicate unicast or multicast in the destination MAC address to obtain a unicast MAC address.

The determining unit 44 is coupled to the inverting unit 42 and is configured to determine to terminate the loopback detection message if the unicast MAC address is consistent with the stored maintenance intermediate point MIP address.

FIG. 5 is a structural block diagram 3 of a loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 5, optionally, the apparatus includes, in addition to all the modules shown in FIG.

The forwarding unit 52 is configured to forward the loopback detection packet to the MIP corresponding to the MIP address that is consistent with the obtained unicast MAC address.

The terminating unit 54, coupled to the forwarding unit 52, is configured to detect the message by the MIP termination loopback.

FIG. 6 is a structural block diagram of a loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 6, optionally, the apparatus includes, in addition to all the modules shown in FIG.

The forwarding module 62 is coupled to the determining module 34, and configured to forward the loopback detection packet according to the multicast information carried in the loopback detection packet if the determination result is negative.

Optionally, the multicast information may include: a BIER tag and a bit mask.

Optionally, the destination MAC address is a multicast MAC address obtained by using the MIP address of the destination maintenance intermediate point of the loopback detection to indicate unicast or multicast bit reversal.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Another loopback detecting device is also provided in this embodiment. FIG. 7 is a structural block diagram of another loopback detecting device according to an embodiment of the present invention. As shown in FIG. 7, the device includes:

The first port 72 and the processing chip 74, wherein the first port 72 is connected to the processing chip 74; the first port 72 is configured to receive the loopback detection message, wherein the loopback detection message carries the destination media access control MAC The address and destination MAC address are multicast MAC addresses. The processing chip 74 is configured to determine whether to terminate the loopback detection packet according to the destination MAC address. If the judgment result is yes, the loopback detection packet is terminated.

The first port receives the loopback detection packet, where the loopback detection packet carries the destination media access control MAC address, and the destination MAC address is a multicast MAC address; The destination MAC address determines whether the loopback detection packet is terminated. If the judgment result is yes, the loopback detection packet is terminated. When the destination MAC address carried in the received loopback detection packet is a multicast MAC address, it is determined whether the loopback detection packet is terminated according to the multicast MAC address, and if the judgment result is yes, the termination is performed. Loopback detection packet. Therefore, the loopback detection packet of the multicast mode terminated by the MIP can be implemented.

FIG. 8 is a block diagram showing the structure of another loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus further includes: a memory 82, wherein the memory 82 is connected to the processing chip 74, and the memory is connected to the processing chip 74. 82 is set to store the MIP address of the configured MIP.

Optionally, the processing chip 74 is configured to: invert the bit used to indicate unicast or multicast in the destination MAC address to obtain a unicast MAC address; determine whether the obtained unicast MAC address is consistent with the MIP address stored in the memory; When it is determined that the obtained unicast MAC address is consistent with the stored MIP address, the loopback detection packet is determined to be terminated.

FIG. 9 is a structural block diagram 3 of another loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 9, the apparatus further includes: one or more MIPs 92, wherein

One or more MIPs 92 are connected to the processing chip 74; the processing chip 74 is configured to forward the loopback detection message to the MIP 92 corresponding to the MIP address that is consistent with the obtained unicast MAC address; and indicate the corresponding MIP 92 termination loopback detection. The packet is configured to terminate the loopback detection packet according to the indication of the processing chip.

FIG. 10 is a structural block diagram of another loopback detecting apparatus according to an embodiment of the present invention. As shown in FIG. 10, the apparatus further includes: a second port 102, where

The second port 102 is connected to the processing chip 74. The processing chip 74 is configured to instruct the second port 102 to forward the loopback detection packet according to the destination MAC address when it is determined that the loopback detection packet is not terminated; the second port 102 is configured. A loopback detection message is sent according to the indication of the processing chip 74.

The following is a detailed description in conjunction with an alternative embodiment of the invention.

An alternative embodiment of the present invention provides a loopback detection method based on BIER forwarding, so that the MIP termination configured on the intermediate node of the transmission path terminates the loopback detection packet based on the BIER forwarding.

In the loopback detection method based on the BIER forwarding method, the MEP sends a loopback detection packet, and the destination MAC address of the packet is the bit of the MIP address indicating "unicast or multicast". The multicast MAC address formed after the transfer; after receiving the loopback detection packet, the network node configured with the MIP unicasts the MAC address and network formed by inverting the unicast or multicast bit in the destination MAC address. The addresses of the MIPs configured on the node are compared to determine whether to terminate the message.

For a traditional Ethernet that does not support BIER forwarding, only one MAC forwarding table is stored on the network node. When the loopback detection runs on the MEP to the MIP, the loopback detection packet sent by the MEP uses the MAC address of the MIP as the destination MAC address. The MAC address is a unicast MAC address. After receiving the loopback detection packet sent by the MEP, the MIP can terminate the forwarding of the frame by determining the destination MAC address of the loopback detection packet as the MAC address of the MIP. The Ethertype of the loopback detection packet is 0x8902 to enter the standard OAM packet processing flow. For Ethernet supporting BIER forwarding, two independent MAC forwarding tables and BIER forwarding tables are stored on the network node. When loopback detection runs from MEP to MIP, the above method can only implement MAC forwarding table based on MAC forwarding. The detection of the BIER forwarding table based on BIER forwarding cannot be achieved, and the loopback detection function cannot be achieved.

A loopback detection method based on BIER forwarding provided by an optional embodiment of the present invention includes the following steps:

In step A, the network operator inputs the MIP address and starts the loopback detection function based on the BIER forwarding of the MEP to the MIP.

Both the MEP and the MIP are maintenance points configured by the network operator on the network. The maintenance point is based on the port configuration. The MEP address is the MAC address of the port where the MEP is located. The MIP address is the MAC address of the port where the MIP is located, and all ports in the network are The MAC addresses are all unicast addresses. The MIP address entered by the network operator in this step is the unicast MAC address of the port where the MIP is located.

In the BIER-enabled Ethernet, there are two ways to forward the loopback detection packets sent by the MEP to the MIP. One is MAC-based forwarding and the other is BIER-based forwarding. If the network operator needs to use the loopback detection message to detect the MAC forwarding table of each network node on the transmission path, perform a MAC forwarding-based loopback detection function; if the network operator needs to use the loopback detection packet to detect the transmission path The BIER forwarding table of each network node performs loopback detection based on BIER forwarding. In this step, the network operator performs the loopback detection function based on BIER forwarding.

In step B, the MEP sends a loopback detection packet, where the destination MAC address of the packet is a multicast MAC address formed by the bit unicast or multicast in the MIP address input by the network operator.

11 is a schematic diagram of a MAC address format according to an alternative embodiment of the present invention. As shown in FIG. 11, the MAC address has 48 bits, that is, 6 bytes, wherein the lowest bit of the first byte is used to indicate " Unicast or multicast", optionally, the lowest bit of the first byte of the MAC address is 1 indicating that the MAC address is a multicast address, and the lowest bit of the first byte of the MAC address is 0, indicating that the MAC address is A unicast address.

The network node configured with the MEP reverses the bit indicating "unicast or multicast" in the MIP address input by the network operator, that is, the bit indicating "unicast or multicast" is from the unicast indicating 0. The IP address of the loopback detection packet sent by the MEP is used as the destination MAC address of the loopback detection packet sent by the MEP.

Step C: After receiving the loopback detection packet, the network node configured with the MIP sets the unicast MAC address formed by inverting the unicast or multicast bit in the destination MAC address and the MIP configured on the network node. The addresses are compared to determine if the message is terminated.

After receiving the loopback detection packet sent by the MEP, the network node that has not configured the MIP determines that the destination MAC address of the packet is a multicast MAC address, and then selects the BIER forwarding table for BIER-based forwarding. Forwarding, and will not select the MAC forwarding table for MAC-based forwarding, thus achieving the purpose of detecting the BIER forwarding table of the network node on the transmission path.

After receiving the loopback detection packet sent by the MEP, the network node configured with the MIP determines that the destination MAC address of the packet is a multicast MAC address, and then inverts the bit indicating "unicast or multicast" in the destination MAC address. A unicast MAC address is then formed, and the resulting unicast MAC address is compared to the address of the MIP configured on the network node. If the two addresses are the same, the message is terminated and further loopback detection is processed. If the two addresses are not consistent, the message is not terminated, but the BIER forwarding table is selected for BIER-based. Forwarding, thus achieving the purpose of detecting the BIER forwarding table of the network node on the transmission path.

FIG. 12 is a schematic diagram of a BIER-based loopback detection method according to an alternative embodiment of the present invention. As shown in FIG. 12, the network includes a BIER switch 1, a BIER switch 2, a BIER switch 3, and a BIER switch 16, a total of 16 The switch that supports BIER forwarding, the BIER forwarding-based transmission path from the BIER switch 1 through the BIER switches 2, 4, 7, and 11 to the BIER switch 15 is the transmission path to be detected. The network operator configures two MEPs and four MIPs on the transmission path to be detected. MEP1 is configured on port 1 of BIER switch 1, and MEP2 is configured on port 1 of BIER switch 15, on BIER switch 4 MIP1 and MIP2 are configured on port 1 and port 2, respectively, and MIP3 and MIP4 are respectively configured on port 1 of BIER switch 7 and port 1 of BIER switch 11. The MAC address of port 1 of BIER switch 4 is 00-11-22-00-00-41, which is the address of MIP1; the MAC address of port 2 of BIER switch 4 is 00-11-22-00-00-42. That is, the address of MIP2; the MAC address of port 1 of BIER switch 7 is 00-11-22-00-00-71, that is, the address of MIP3; the MAC address of port 1 of BIER switch 11 is 00-11-22- 00-00-B1, which is the address of MIP4.

The following examples are given to illustrate and describe the loopback detection method provided by the alternative embodiment based on FIG.

Example one

In this example, the network operator performs BIER forwarding-based loopback detection from MEP1 to MIP1, which mainly includes the following steps:

In step 11, the network operator inputs the address 00-11-22-00-00-41 of MIP1, and starts the loopback detection function based on BIER forwarding of MEP1 to MIP1.

In step 12, the MEP1 sends a loopback detection packet, and the destination MAC address of the packet is 01-11-22-00-00-41.

The destination MAC address 01-11-22-00-00-41 of the loopback detection packet is the bit indicating "unicast or multicast" in the MIP1 address 00-11-22-00-00-41 input by the network operator. The multicast MAC address formed after the reverse.

Because the network operator initiates the loopback detection function based on the BIER forwarding, the loopback detection packet sent by MEP1 should carry the multicast MAC address as the destination MAC address, and should also carry the BIER label and bit mask for BIER forwarding. The code, where the value of the bit mask should indicate that the BIER switch forwards the loopback detection message along the to-be-detected transmission path.

Step 13: After receiving the loopback detection packet sent by the MEP1, the BIER switch 2 determines that the destination MAC address of the packet is 01-11-22-00-00-41, which is based on the BIER label carried in the packet. And the bit mask forwards the BIER packet to its next hop BIER switch 4.

Since the BIER switch 2 is not configured with any maintenance point, the BIER switch 2 receives the loopback detection packet sent by the MEP1 and determines that the destination MAC address of the packet is 01-11-22-00-00-41. , does not reverse the destination MAC address of the message.

Step 14: After receiving the loopback detection packet, the BIER switch 4 determines that the destination MAC address of the packet is 01-11-22-00-00-41, and then sets the destination MAC address 01-11-22- 00-00-41 is reversed to 00-11-22-00-00-41 and compared with the addresses of MIP1 and MIP2 configured on the BIER switch 4 to determine that the loopback detection message is terminated by MIP1.

The BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2 and determines that the destination MAC address of the packet is 01-11-22-00-00-41 as the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-41 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-41 and The addresses of the MIPs configured on the BIER switch 4 are compared one by one. The result of the comparison is that the unicast MAC address 00-11-22-00-00-41 formed after the reverse is the same as the address of the MIP1, so the BIER switch 4 The loopback detection packet will not be forwarded again. The loopback detection packet will be terminated by MIP1 and further processed.

Example two

In this example, the network operator performs BIER forwarding-based loopback detection from MEP1 to MIP2, which mainly includes the following steps:

In step 21, the network operator inputs the address 00-11-22-00-00-42 of the MIP2, and starts the loopback detection function based on the BIER forwarding of the MEP1 to the MIP2.

In step 22, the MEP1 sends a loopback detection packet, and the destination MAC address of the packet is 01-11-22-00-00-42.

The destination MAC address of the loopback detection packet 01-11-22-00-00-42 is the bit indicating "unicast or multicast" in the MIP2 address 00-11-22-00-00-42 entered by the network operator. The multicast MAC address formed after the reverse.

Step 23: After receiving the loopback detection packet sent by the MEP1, the BIER switch 2 determines that the destination MAC address of the packet is 01-11-22-00-00-42, and is based on the BIER label carried in the packet. And the bit mask forwards the BIER packet to its next hop BIER switch 4.

Since the BIER switch 2 is not configured with any maintenance point, the BIER switch 2 receives the loopback detection packet sent by the MEP1 and determines that the destination MAC address of the packet is 01-11-22-00-00-42. , does not reverse the destination MAC address of the message.

Step 24: After receiving the loopback detection packet, the BIER switch 4 determines that the destination MAC address of the packet is 01-11-22-00-00-42, and then sets the destination MAC address 01-11-22- 00-00-42 is reversed to 00-11-22-00-00-42 and compared with the addresses of MIP1 and MIP2 configured on the BIER switch 4 to determine that the loopback detection message is terminated by MIP2 and loopback is performed. The detection packet is forwarded to MIP2.

The BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2 and determines that the destination MAC address of the packet is 01-11-22-00-00-42 as the multicast MAC address. After that, the destination MAC address will be 01-11-22-00-00-42 indicates the unicast MAC address 00-11-22-00-00-42 formed by the unicast or multicast bit reversed and configured on the BIER switch 4. The MIP addresses are compared one by one. The result of the comparison is that the unicast MAC address 00-11-22-00-00-42 formed after the above reversal is consistent with the address of the MIP2, so the BIER switch 4 continues the loopback detection message. Forwarded to MIP2, the loopback detection message will be terminated by MIP2 and further processed.

Example three

In this example, the network operator performs BIER-based forwarding-based loopback detection from MEP1 to MIP3, which mainly includes the following steps:

In step 31, the network operator inputs the address 00-11-22-00-00-71 of the MIP3, and starts the loopback detection function based on the BIER forwarding of the MEP1 to the MIP3.

In step 32, the MEP1 sends a loopback detection packet, and the destination MAC address of the packet is 01-11-22-00-00-71.

The destination MAC address 01-11-22-00-00-71 of the loopback detection packet is the bit indicating "unicast or multicast" in the MIP3 address 00-11-22-00-00-71 input by the network operator. The multicast MAC address formed after the reverse.

Step 33: After receiving the loopback detection packet sent by the MEP1, the BIER switch 2 determines that the destination MAC address of the packet is 01-11-22-00-00-71, and is based on the BIER label carried in the packet. And the bit mask forwards the BIER packet to its next hop BIER switch 4.

Since the BIER switch 2 is not configured with any maintenance point, the BIER switch 2 receives the loopback detection packet sent by the MEP1 and determines that the destination MAC address of the packet is 01-11-22-00-00-71. , does not reverse the destination MAC address of the message.

Step 34: After receiving the loopback detection packet, the BIER switch 4 determines that the destination MAC address of the packet is 01-11-22-00-00-71, and then sets the destination MAC address 01-11-22- 00-00-71 After the inversion is 00-11-22-00-00-71, the MIP1 and MIP2 addresses configured on the BIER switch 4 are compared. It is determined that no MIP can terminate the loopback detection packet, so the BIER is carried based on the packet. The tag and the bit mask forward the packet to the BIER switch 7 for its next hop.

The BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2 and determines that the destination MAC address of the packet is 01-11-22-00-00-71 as the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-71 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-71 and The addresses of the MIPs configured on the BIER switch 4 are compared one by one. The result of the comparison is that the unicast MAC address 00-11-22-00-00-71 formed after the reverse is inconsistent with the addresses of MIP1 and MIP2, so The BIER switch 4 will continue to forward the loopback detection message to the BIER switch 7.

Step 35: After receiving the loopback detection message, the BIER switch 7 determines that the destination MAC address of the packet is 01-11-22-00-00-71, and then sets the destination MAC address 01-11-22- After the 00-00-71 is reversed to 00-11-22-00-00-71, it is compared with the address of the MIP3 configured on the BIER switch 7, and it is determined that the loopback detection message is terminated by the MIP3.

The BIER switch 7 receives the loopback detection packet forwarded by the BIER switch 4 and determines that the destination MAC address of the packet is 01-11-22-00-00-71 as the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-71 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-71 and The address of the MIP configured on the BIER switch 7 is compared. The result of the comparison is that the unicast MAC address 00-11-22-00-00-71 formed after the reverse is the same as the address of the MIP3, so the BIER switch 7 is no longer The loopback detection packet is forwarded, and the loopback detection packet is terminated by MIP3 and further processed.

Example four

In this example, the network operator performs BIER forwarding-based loopback detection from MEP1 to MIP4, which mainly includes the following steps:

In step 41, the network operator inputs the address 00-11-22-00-00-B1 of the MIP4, and starts the loopback detection function based on the BIER forwarding of the MEP1 to the MIP4.

Step 42: The MEP1 sends a loopback detection packet, and the destination MAC address of the packet is 01-11-22-00-00-B1.

The destination MAC address 01-11-22-00-00-B1 of the loopback detection packet is the bit indicating "unicast or multicast" in the MIP4 address 00-11-22-00-00-B1 input by the network operator. The multicast MAC address formed after the reverse.

Step 43: After receiving the loopback detection packet sent by the MEP1, the BIER switch 2 determines that the destination MAC address of the packet is 01-11-22-00-00-B1, and is based on the BIER label carried in the packet. And the bit mask forwards the BIER packet to its next hop BIER switch 4.

Since the BIER switch 2 is not configured with any maintenance point, the BIER switch 2 receives the loopback detection packet sent by the MEP1 and determines that the destination MAC address of the packet is 01-11-22-00-00-B1. , does not reverse the destination MAC address of the message.

Step 44: After receiving the loopback detection packet, the BIER switch 4 determines that the destination MAC address of the packet is 01-11-22-00-00-B1, and then sets the destination MAC address 01-11-22- 00-00-B1 is reversed to 00-11-22-00-00-B1 and compared with the addresses of MIP1 and MIP2 configured on the BIER switch 4. It is determined that no MIP can terminate the loopback detection message, so it is based on The BIER tag and the bit mask carried in the packet forward the BIER and send it to its next hop BIER switch 7.

The BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2 and determines that the destination MAC address of the packet is 01-11-22-00-00-B1 is the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-B1 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-B1 is The addresses of the MIPs configured on the BIER switch 4 are compared one by one. The result of the comparison is that the unicast MAC address 00-11-22-00-00-B1 formed after the reverse is inconsistent with the addresses of MIP1 and MIP2, so BIER switch 4 will continue to forward loopback detection packets. Go to the BIER switch 7.

Step 45: After receiving the loopback detection packet, the BIER switch 7 determines that the destination MAC address of the packet is 01-11-22-00-00-B1, and then sets the destination MAC address 01-11-22- After 00-00-B1 is reversed to 00-11-22-00-00-B1, it is compared with the address of MIP3 configured on the BIER switch 7. It is determined that no MIP can terminate the loopback detection packet, so it is based on the packet. The carried BIER tag and the bit mask forward the BIER packet and send it to its next hop BIER switch 11.

The BIER switch 7 receives the loopback detection packet forwarded by the BIER switch 4 and determines that the destination MAC address of the packet is 01-11-22-00-00-B1 is the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-B1 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-B1 is The address of the MIP configured on the BIER switch 7 is compared. The result of the comparison is that the unicast MAC address 00-11-22-00-00-B1 formed after the reverse is inconsistent with the address of the MIP3, so the BIER switch 7 will continue. The loopback detection packet is forwarded to the BIER switch 11.

Step 46: After receiving the loopback detection packet, the BIER switch 11 determines that the destination MAC address of the packet is 01-11-22-00-00-B1, and then sets the destination MAC address 01-11-22- 00-00-B1 is inverted to 00-11-22-00-00-B1 and compared with the address of MIP4 configured on the BIER switch 11, and it is determined that the loopback detection message is terminated by MIP4.

The BIER switch 11 receives the loopback detection packet forwarded by the BIER switch 7 and determines that the destination MAC address of the packet is 01-11-22-00-00-B1 is the multicast MAC address. After that, the unicast MAC address 00-11-22-00-00-B1 formed by inverting the bit indicating "unicast or multicast" in the destination MAC address 01-11-22-00-00-B1 is The address of the MIP configured on the BIER switch 11 is compared. The result of the comparison is that the unicast MAC address 00-11-22-00-00-B1 formed after the reverse is the same as the address of the MIP4, so the BIER switch 11 is no longer The loopback detection packet is forwarded, and the loopback detection packet is terminated by MIP4 and further processed.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1: Receive a loopback detection packet, where the loopback detection packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address.

S2, determining, according to the destination MAC address, whether to terminate the loopback detection packet;

S3. If the judgment result is yes, the loopback detection message is terminated.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S1, the bit in the destination MAC address used to indicate unicast or multicast is reversed to obtain a unicast MAC address.

S2. If the unicast MAC address is consistent with the stored maintenance intermediate MIP address, determine to terminate the loopback detection packet.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and functional blocks/units of the methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical units; for example, one physical component may have multiple functions, or one function or step may be composed of several physical The components work together. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer readable medium, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules, or other data. , removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridge, magnetic tape, magnetic disk storage or other magnetic storage device, or may Any other medium used to store the desired information and that can be accessed by the computer. Moreover, it is well known to those skilled in the art that Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The above embodiment implements a loopback detection packet in which the MIP terminates the multicast mode.

Claims

A loopback detection method includes:

Receiving a loopback detection message, where the loopback detection message carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address (S202);

Determining whether to terminate the loopback detection message according to the destination MAC address (S204);

If the result of the determination is YES, the loopback detection message is terminated (S206).
The method of claim 1, wherein determining whether to terminate the loopback detection message according to the destination MAC address (S204) comprises:

Decoding the unicast or multicast bit in the destination MAC address to obtain a unicast MAC address;

When the unicast MAC address is consistent with the stored maintenance intermediate MIP address, it is determined that the loopback detection message is terminated.
The method of claim 2, wherein terminating the loopback detection message (S206) comprises:

Forwarding the loopback detection packet to a MIP corresponding to the MIP address that is consistent with the obtained unicast MAC address;

The loopback detection packet is terminated by the MIP.
The method of claim 1 further comprising:

After the loopback detection packet is terminated according to the destination MAC address, if the loopback detection packet is terminated, the loopback detection packet is forwarded according to the multicast information carried in the loopback detection packet. .
The method of claim 4 wherein said multicast information comprises: a bit index display copy BIER tag and a bit mask.
The method according to any one of claims 1 to 5, wherein the destination MAC address is used to indicate a unicast or multicast bit inversion in a destination maintenance intermediate point MIP address of the loopback detection. Multicast MAC address.
A loopback detecting device comprising:

The receiving module (32) is configured to receive a loopback detection packet, where the loopback detection packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address;

The determining module (34) is configured to determine, according to the destination MAC address, whether to terminate the loopback detection message;

The termination module (36) is configured to terminate the loopback detection message if the determination result is yes.
The apparatus of claim 7 wherein said determining module (34) comprises:

The inverting unit (42) is configured to invert the bit used to indicate unicast or multicast in the destination MAC address to obtain a unicast MAC address.

The determining unit (44) is configured to determine to terminate the loopback detection message if the unicast MAC address is consistent with the stored maintenance intermediate point MIP address.
The apparatus of claim 8 wherein said terminating module (36) comprises:

The forwarding unit (52) is configured to forward the loopback detection packet to a MIP corresponding to the MIP address that is consistent with the obtained unicast MAC address;

The terminating unit (54) is configured to terminate the loopback detection message by the MIP.
The apparatus of claim 7 further comprising:

The forwarding module (62) is configured to forward the loopback detection packet according to the multicast information carried in the loopback detection packet if the determination result is negative.
The apparatus of claim 10, wherein the multicast information comprises: a bit index display copy BIER tag and a bit mask.
The apparatus according to any one of claims 7 to 11, wherein the destination MAC address is used to indicate a unicast or multicast bit inversion in a destination maintenance intermediate point MIP address of the loopback detection. Multicast MAC address.
A loopback detecting device includes: a first port (72) and a processing chip (74), wherein

The first port (72) is connected to the processing chip (74);

The first port (72) is configured to receive a loopback detection message, where the loopback detection report The packet carries a destination media access control MAC address, and the destination MAC address is a multicast MAC address;

The processing chip (74) is configured to determine, according to the destination MAC address, whether to terminate the loopback detection packet; if the determination result is yes, terminate the loopback detection packet.
The apparatus of claim 13 further comprising:

A memory (82), wherein the memory (82) is coupled to the processing chip (74), the memory (82) being configured to store a MIP address of a configured maintenance intermediate point MIP.
The device according to claim 14, wherein

The processing chip (74) is configured to: invert the bit used to indicate unicast or multicast in the destination MAC address, to obtain a unicast MAC address; and determine the obtained unicast MAC address and the memory storage. Whether the MIP address is consistent; if the obtained unicast MAC address is consistent with the stored MIP address, it is determined that the loopback detection message is terminated.
The apparatus of claim 15 further comprising: one or more MIPs (92), wherein

The one or more MIPs (92) are connected to the processing chip (74);

The processing chip (74) is configured to forward the loopback detection message to a MIP corresponding to a MIP address that is consistent with the obtained unicast MAC address (92); and instruct the corresponding MIP (92) to terminate the Loopback detection message;

The corresponding MIP (92) is configured to terminate the loopback detection message according to the indication of the processing chip (74).
Apparatus according to any one of claims 13 to 16, further comprising: a second port (102), wherein

The second port (102) is connected to the processing chip (74);

The processing chip (74) is further configured to: when it is determined that the loopback detection packet is not to be terminated, instruct the second port (102) to forward the loopback detection packet according to the destination MAC address;

The second port (102) is configured to send the loopback detection message according to an indication of the processing chip.