WO2018040940A1

WO2018040940A1 - Two-layer network, and loopback detection method of two-layer network

Info

Publication number: WO2018040940A1
Application number: PCT/CN2017/097923
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: 2016-09-01
Filing date: 2017-08-17
Publication date: 2018-03-08
Also published as: CN107800581B; CN107800581A

Abstract

The embodiments of the invention provide a two-layer network, and a loopback detection method of a two-layer network. The method comprises: upon a network node in a two-layer network configuring a MIP to detect a BIER forwarding table or a MAC forwarding table, transmitting, to remaining network nodes, an MIP address for detecting the BIER forwarding table or the MAC forwarding table; upon activation of a loopback detection function from an MEP to a target MIP, transmitting, by the MEP, a loopback detection packet carrying a target MIP address; and upon one network node in the two-layer network receiving the loopback packet, when no MIP is configured at the network node, or a configured MIP address is inconsistent with the target MIP address, forwarding, according to the target MIP address, and based on the BIER forwarding table or the MAC forwarding table, the loopback detection packet.

Description

Loopback detection method for layer 2 network and layer 2 network

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to a loopback detection method for a Layer 2 network and a Layer 2 network, which is applicable to a scenario in which a Bit Indexed Explicit Replication (BIER) is applied to a Layer 2 network. The Layer 2 network is a data link layer network.

Background technique

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

The IEEE 802.1ag standard defines an OAM functional logical entity in Ethernet, which includes a Maintenance End Point (MEP) located at both ends of the Ethernet transmission path, and a maintenance intermediate point located in the middle of the Ethernet transmission path (Maintenance Intermediate) Point, referred to as MIP; maintenance endpoints and maintenance intermediate points are collectively referred to as Maintenance Points (MP); maintenance points in Ethernet are created based on ports of network nodes, and port MAC (Media Access Control, media access) The control address is the MAC address based on the maintenance point created by 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, in order to detect the whole or A failure of an Ethernet transmission path in which the failure of the Ethernet transmission path 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. FIG. 1 is a schematic diagram of a loopback detection mechanism based on MAC forwarding in the related art. As shown in FIG. 1, one switch 1 and one switch 4 are created. MEP and 1 MIP, Switch 2 and Switch 3 each have two MIPs. The MEP created by Switch 1 is MEP1, the MIP created by Switch 1 is MIP1, the MEP created by Switch 4 is MEP2, and the MIP created by Switch 4 is MIP. MIP6; the two MIPs created by switch 2 are MIP2 and MIP3 respectively. The two MIPs created by switch 3 are represented as MIP4 and MIP5 respectively. On the basis of Figure 1, an example loopback detection process 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 detects the packet along the loopback. The transmission path (ie, the MAC-based forwarding path) arrives at MIP5.

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

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.

U.S. Patent Application No. US2015078380 (Bit Indexed Explicit Replication For Layer 2 Networking) discloses a method for implementing a BIER Layer 2 network, which defines: a BIER tag located in an Ethernet frame header. (BIER Tag) and Bit Mask. 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 the unicast MAC address, the BIER label is ignored, the MAC forwarding table is searched according to the destination MAC address, and the packet forwarding is performed according to the MAC forwarding mechanism. When the destination MAC address of the Ethernet frame is the multicast MAC address. Ignore the destination MAC address, look up the BIER forwarding table according to the BIER tag, and forward the packet according to the BIER forwarding mechanism.

When the loopback detection function is applied to the BIER Layer 2 network, the loopback detection for the BIER forwarding table on the transmission path to be detected cannot be implemented in the application scenario of loopback detection from the MEP to the MIP.

Summary of the invention

In order to solve the existing technical problems, the embodiments of the present disclosure provide a loopback detection method for a Layer 2 network and a Layer 2 network, which is used to solve the application scenario of loopback detection for the MEP to the MIP. The problem of loopback detection of the BIER forwarding table on the path.

In order to achieve the above object, the technical solution of the embodiment of the present disclosure is implemented as follows:

An embodiment of the present disclosure provides a loopback detection method for a Layer 2 network, where the method includes:

After the MIP of the BIER forwarding table is configured to detect the MIP of the BIER forwarding table or the MIP for detecting the MAC forwarding table, the MIP address for detecting the BIER forwarding table is sent to all the other network nodes in the Layer 2 network. MIP address used to detect the MAC forwarding table;

After the loopback detection function is enabled on the MEP to the target MIP, the MEP sends a loopback detection packet carrying the target MIP address.

After receiving the loopback detection message, the network node does not configure the MIP on the network node, or the configured MIP address is inconsistent with the target MIP address, according to the target. The MIP address performs forwarding based on the BIER forwarding table or forwarding based on the MAC forwarding table on the loopback detection message.

In the above solution, the method further includes: after receiving the loopback detection message, when the address of the MIP configured by the network node is consistent with the target MIP address, the network node of the Layer 2 network Ending the loopback detection message.

In the above solution, the method further includes:

When receiving the MIP address for detecting the BIER forwarding table, any one of the Layer 2 networks adds the received MIP address to the address filtering table, and configures the received MIP address to be based on the BIER forwarding table. Forwarding MIP address; when receiving the MIP address for detecting the MAC forwarding table, any one of the Layer 2 networks adds the received MIP address to the address filtering table, and configures the received MIP address. MIP address forwarded based on the MAC forwarding table;

Correspondingly, the loopback detection packet is forwarded according to the BIER forwarding table according to the target MIP address. Or forwarding based on the MAC forwarding table, including:

The network node selects the BIER forwarding table based forwarding or the MAC forwarding table based forwarding by comparing the target MIP address with the MIP address in the address filtering table.

In the above solution, the method further includes: configuring the MIP located on the same loopback detection packet transmission path as the MIP for detecting the BIER forwarding table or the MIP for detecting the MAC forwarding table.

In the above solution, the address of the target MIP is a unicast MAC address of a port where the target MIP is located.

The embodiment of the present disclosure further provides a Layer 2 network, where any one of the Layer 2 networks is used to configure a MIP for detecting a BIER forwarding table or a MIP for detecting a MAC forwarding table. All other network nodes in the layer network send a MIP address for detecting the BIER forwarding table or a MIP address for detecting the MAC forwarding table;

The MEP in the Layer 2 network is configured to send a loopback detection packet carrying the target MIP address after the loopback detection function of the MEP to the target MIP is started.

The network node of the Layer 2 network is configured to: after receiving the loopback detection message, if the MIP address is not configured on the network node, or the configured MIP address is inconsistent with the target MIP address, The target MIP address performs forwarding based on the BIER forwarding table or forwarding based on the MAC forwarding table on the loopback detection packet.

In the foregoing solution, any one of the network nodes of the Layer 2 network is further configured to: after receiving the loopback detection packet, when the address of the MIP configured by the network node is consistent with the target MIP address, The loopback detection packet.

In the above solution, any one of the network nodes in the Layer 2 network is further configured to: when receiving the MIP address for detecting the BIER forwarding table, add the received MIP address to the address filtering table, and receive the received The MIP address is configured to be based on the MIP address forwarded by the BIER forwarding table; when receiving the MIP address for detecting the MAC forwarding table, the received MIP address is added to the address filtering table, and the received MIP address is configured to be based on the MAC address. The MIP address forwarded by the forwarding table;

Correspondingly, any one of the network nodes of the Layer 2 network is configured to perform the BIER-based selection of the loopback detection message by comparing the target MIP address with the MIP address in the address filtering table of the local network node. Published forwarding or forwarding based on MAC forwarding table.

In the above solution, the MIP located on the same loopback detection packet transmission path is configured as the MIP for detecting the BIER forwarding table or the MIP for detecting the MAC forwarding table.

In the loopback detection method and the Layer 2 network of the Layer 2 network provided by the embodiment of the present disclosure, any one of the network nodes in the Layer 2 network is configured to detect a bit index to explicitly copy the maintenance intermediate point MIP of the BIER forwarding table or use After detecting the MIP of the medium access control MAC forwarding table, sending a MIP address for detecting the BIER forwarding table or a MIP address for detecting the MAC forwarding table to all the remaining network nodes in the Layer 2 network; starting the maintenance endpoint MEP to After the loopback detection function of the target MIP, the MEP sends a loopback detection packet carrying the target MIP address; after receiving the loopback detection packet, any one of the network nodes in the Layer 2 network is in the network node. If the MIP is not configured, or the configured MIP address is inconsistent with the target MIP address, the loopback detection packet is forwarded based on the BIER forwarding table or forwarded based on the MAC forwarding table according to the target MIP address; The application scenario of the loopback detection of the MEP to the MIP can implement loopback detection for the MAC forwarding table on the transmission path to be detected, and implement the detection for the transmission path to be detected. Loopback detection of the BIER forwarding table on the trail.

DRAWINGS

1 is a schematic diagram of a loopback detection mechanism based on MAC forwarding in the related art;

2 is a schematic flowchart of a loopback detection method of a Layer 2 network according to an embodiment of the present disclosure;

3 is a schematic diagram of an implementation manner of loopback detection in a BIER Layer 2 network according to Embodiment 1 of the present disclosure;

4 is a schematic diagram of an implementation manner of loopback detection in a BIER Layer 2 network according to Embodiment 2 of the present disclosure;

5 is a schematic diagram of an implementation manner of loopback detection in a BIER Layer 2 network according to Embodiment 3 of the present disclosure;

6 is a schematic diagram of an implementation manner of loopback detection in a BIER Layer 2 network according to Embodiment 4 of the present disclosure.

detailed description

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

The embodiment of the present disclosure describes a loopback detection method for a Layer 2 network. FIG. 2 is a schematic flowchart of a loopback detection method for a Layer 2 network according to an embodiment of the present disclosure. As shown in FIG. 2, the process includes:

Step 201: Any one of the network nodes in the Layer 2 network is configured to detect the MIP of the BIER forwarding table or the MIP used to detect the MAC forwarding table, and then send the BIER forwarding table to all the remaining network nodes in the Layer 2 network. MIP address or MIP address used to detect the MAC forwarding table.

That is, if any one of the network nodes in the Layer 2 network is configured with the MIP for detecting the BIER forwarding table, the MIP address for detecting the BIER forwarding table is advertised to all the other network nodes in the Layer 2 network; Any one of the network nodes in the network is configured with a MIP for detecting the MAC forwarding table, and then advertises the MIP address for detecting the MAC forwarding table to all other network nodes in the Layer 2 network.

It should be noted that a MIP cannot be configured as the MIP for detecting the BIER forwarding table and the MIP for detecting the MAC forwarding table, and the MIPs located on the same loopback detection packet can be configured at the same time. The MIP for detecting the BIER forwarding table or the MIP for detecting the MAC forwarding table.

Further, when receiving the MIP address for detecting the BIER forwarding table, any one of the network nodes in the Layer 2 network adds the received MIP address to the address filtering table, and configures the received MIP address as based on The MIER address forwarded by the BIER forwarding table; when receiving the MIP address for detecting the MAC forwarding table, any one of the network nodes in the Layer 2 network adds the received MIP address to the address filtering table, and receives the received The MIP address is configured to be based on the MIP address forwarded by the MAC forwarding table.

Here, the address filtering table is used to select BIER forwarding or MAC forwarding for a specific packet destination MAC address. Specifically, the packet carrying the specific packet destination MAC address is classified into BIER forwarding based on the BIER label in the packet. A MAC forwarding table that is forwarded based on the destination MAC address of the packet; in the related art, the packet carrying the destination MAC address of the unicast packet is classified into a MAC forwarding table, and the packet carrying the destination MAC address of the multicast packet is Assigned to the BIER forwarding table.

The network node receives the MIP if it receives the MIP address advertised by other network nodes for detecting the BIER forwarding table. The address is added to the address filtering table, and the MIP address is configured as a MIP address forwarded based on the BIER forwarding table; if the network node receives the MIP address advertised by the other network node for detecting the MAC forwarding table, the MIP address is added to the MIP address. An address filtering table and configuring the MIP address as a MIP address forwarded based on the MAC forwarding table.

Step 202: After the loopback detection function of the maintenance terminal MEP to the target MIP is started, the MEP sends a loopback detection packet carrying the target MIP address.

In an implementation of this step, after the network operator inputs the address of the target MIP and starts the loopback detection function of the MEP to the target MIP, the MEP sends a loopback detection packet whose destination MAC address is the target MIP address input by the network operator. .

Here, the MEP and the target MIP in this step are the maintenance points configured by the network operator in 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 address of the target MIP is the port where the MIP is located. MAC address, and the MAC address of all ports in the network is a unicast address. In this step, the address of the target MIP input by the network operator is the unicast MAC address of the port where the MIP is located; that is, the address of the target MIP is the unicast MAC address of the port where the target 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 based on BIER forwarding and the other is MAC-based forwarding.

Step 203: After receiving the loopback detection message, the network node does not configure the MIP, or the configured MIP address is inconsistent with the target MIP address. The target MIP address performs forwarding based on the BIER forwarding table or forwarding based on the MAC forwarding table on the loopback detection packet.

In an implementation manner of this step, when the network node is not configured with the MIP, or the configured MIP address is inconsistent with the target MIP address, the network node compares the MIP in the target MIP address and address filtering table. The address is selected to perform forwarding based on the BIER forwarding table or forwarding based on the MAC forwarding table.

Further, after receiving the loopback detection message, the network node terminates the loopback detection when the address of the MIP configured by the network node is consistent with the target MIP address after receiving the loopback detection packet. Message.

That is, after receiving the loopback detection packet, any network node in the Layer 2 network selects the BIER forwarding or MAC forwarding according to the address filtering table until the configured MIP address is consistent with the destination address of the loopback detection packet. The network node terminates the message.

If the MIP is not configured on the network node, after receiving the loopback detection packet sent by the MEP, look up the address filtering table based on the destination MAC address of the packet, and select the BIER forwarding table or MAC forwarding table to forward the packet according to the address filtering table.

If the MIP is configured on the network node, after receiving the loopback detection packet sent by the MEP, compare the destination MAC address of the loopback detection packet with the address of the MIP configured on the network node. If the two addresses are the same, the packet is terminated and further loopback detection is processed. If the two addresses are not consistent, the packet is not terminated but is based on the destination MAC address of the packet. Find the address filtering table and select to forward based on the BIER forwarding table or MAC forwarding table according to the address filtering table.

The loopback detection method of the Layer 2 network in the embodiment of the present disclosure can implement loopback detection on the MAC forwarding table of the to-be-detected transmission path, and implement detection for the loopback detection of the MEP to the MIP. Loopback detection of the BIER forwarding table on the transmission path.

Embodiment 1

3 is a schematic diagram of an implementation of loopback detection in a BIER Layer 2 network according to Embodiment 1 of the present disclosure. As shown in FIG. 3, the BIER Layer 2 network includes 16 BIER switches, and the 16 BIER switches are respectively BIER switches. BIER switch 2, BIER switch 3, BIER switch 4, BIER switch 5, BIER switch 6, BIER switch 7, BIER switch 8, BIER switch 9, BIER switch 10, BIER switch 11, BIER switch 12, BIER switch 13, BIER switch 14. BIER switch 15 and BIER switch 16; the above 16 BIER switches are switches that support both BIER forwarding and MAC forwarding, and arrive at BIER from BIER switch 1 through BIER switch 2, BIER switch 4, BIER switch 7, BIER switch 11 The BIER-based forwarding transmission path of the switch 15 is the transmission path to be detected.

The network operator configures two MEPs 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; in addition, the network operator is on BIER switch 7 MIP1 for detecting the BIER forwarding table is configured on port 1.

In an implementation manner, the BIER forwarding-based loopback detection from MEP1 to MIP1 mainly includes the following steps:

Step 11: After the network operator configures MIP1 for detecting the BIER forwarding table on port 1 of the BIER switch 7, the BIER switch 7 advertises the address of the MIP1 to all other network nodes of the BIER layer 2 network, and the MIP1 is used to detect the BIER switch. Instructions issued.

Exemplarily, the address of the MIP1 is the MAC address of the port 1 of the BIER switch 7 00-11-22-00-00-71, and the BIER switch 7 can pass the Open Shortest Path First (OSPF). The protocol, or the Intermediate System to Intermediate System (IS-IS) protocol, or other advertising protocol advertises the address of the MIP1 and the indication of the MIP1 used to detect the BIER forwarding table to other BIER switches in the network. The address of MIP1 occupies six bytes, and the indication used by MIP1 to detect the BIER forwarding table occupies one bit.

Step 12: After receiving the MIP1 address advertised by the BIER switch 7 and the MIP1 indication for detecting the BIER forwarding table, the BIER switch other than the BIER switch 7 in the BIER Layer 2 network adds the MIP1 address to the address filtering table to make the MIP1 address. Corresponds to the BIER forwarding table.

Step 13: After the network operator initiates the loopback detection function of MEP1 to MIP1, MEP1 sends a loopback detection packet whose destination MAC address is MIP1 address 00-11-22-00-00-71.

The loopback detection packet sent by the MEP1 carries the BIER label and the bit mask for the BIER forwarding. The value of the bit mask should indicate that the BIER switch forwards the loopback detection packet along the to-be-detected transmission path.

Step 14: After receiving the loopback detection packet, each BIER switch selects the BIER forwarding table according to the address filtering table to forward the packet until the BIER switch 7 terminates the packet according to the destination MAC address of the loopback detection packet.

Specifically, after receiving the loopback detection packet sent by the MEP1, the BIER switch 2 searches the address filtering table based on the destination MAC address of the packet 00-11-22-00-00-71, and selects the BIER forwarding according to the address filtering table. The BIER switch 2 then forwards the packet to the next hop BIER switch 4 based on the BIER tag and the bit mask carried in the packet.

After receiving the loopback detection packet forwarded by the BIER switch 2, the BIER switch 4 is based on the destination MAC address of the packet. The address 00-11-22-00-00-71 looks up the address filtering table, and selects the BIER forwarding according to the address filtering table. Then, the BIER switch 4 forwards the packet based on the BIER tag and the bit mask carried in the packet, and sends it to the BIER. Next hop BIER switch 7.

Since the BIER switch 7 is configured with the MIP, the BIER switch 7 receives the loopback detection packet forwarded by the BIER switch 4, and then the destination MAC address of the packet is 00-11-22-00-00-71 and the BIER switch 7 The MIP1 address is compared. The result is that the destination MAC address of the packet is the same as the MIP1 address. Therefore, the BIER switch 7 does not forward the loopback detection packet. The loopback detection packet is terminated by MIP1 and further Ground treatment.

Embodiment 2

4 is a schematic diagram of an implementation of loopback detection in a BIER Layer 2 network according to Embodiment 2 of the present disclosure. As shown in FIG. 4, the BIER Layer 2 network includes 16 BIER switches, and the 16 BIER switches are respectively BIER switches. BIER switch 2, BIER switch 3, BIER switch 4, BIER switch 5, BIER switch 6, BIER switch 7, BIER switch 8, BIER switch 9, BIER switch 10, BIER switch 11, BIER switch 12, BIER switch 13, BIER switch 14. BIER switch 15 and BIER switch 16; the above 16 BIER switches are switches that support both BIER forwarding and MAC forwarding, and arrive at BIER from BIER switch 1 through BIER switch 2, BIER switch 4, BIER switch 7, BIER switch 11 The BIER-based forwarding transmission path of the switch 15 is the transmission path to be detected.

The network operator configures two MEPs on the transmission path to be detected. MEP1 is configured on port 1 of BIER switch 1, MEP2 is configured on port 1 of BIER switch 15, and network operator is on BIER switch 4 MIP1 for detecting the BIER forwarding table is configured on port 1, and MIP2 for detecting the BIER forwarding table is configured on port 1 of the BIER switch 7.

In an implementation manner, the BIER forwarding-based loopback detection from MEP1 to MIP2 mainly includes the following steps:

Step 21: After the network operator configures the MIP2 for detecting the BIER forwarding table on the port 1 of the BIER switch 7, the BIER switch 7 advertises the address of the MIP2 to all other network nodes of the BIER layer 2 network, and the MIP2 is used to detect the BIER switch. The instructions issued; similarly, the BIER switch 4 also advertises the address of the MIP1 to all other network nodes of the BIER Layer 2 network and the indication that the MIP1 is used to detect the BIER forwarding table.

Here, the address of the MIP2 is the MAC address 00-11-22-00-00-71 of the port 1 of the BIER switch 7, and the BIER switch 7 can set the address of the MIP2 through the OSPF protocol, or the IS-IS protocol, or other notification protocol. And the indication that the MIP2 is used to detect the BIER forwarding table is advertised to other BIER switches in the network, where the address of the MIP2 occupies six bytes, and the indication that the MIP2 uses to detect the BIER forwarding table occupies one bit. The BIER switch 4 also uses the same method to advertise the address of MIP1 and the indication that MIP1 is used to detect the BIER forwarding table.

Step 22: After receiving the MIP2 address advertised by the BIER switch 7 and the MIP2 indication for detecting the BIER forwarding table, the BIER switch other than the BIER switch 7 in the BIER Layer 2 network adds the MIP2 address to the address filtering table to make the MIP2 address. Corresponds to the BIER forwarding table. Similarly, after the BIER switch other than the BIER switch 4 in the BIER Layer 2 network receives the MIP1 address advertised by the BIER switch 4 and the MIP1 indicates the BIER forwarding table, the MIP1 address is added to the address filter table to make the MIP1 address. Corresponds to the BIER forwarding table.

Step 23: After the network operator initiates the loopback detection function of MEP1 to MIP2, MEP1 issues the destination MAC address. The loopback detection packet is the MIP2 address 00-11-22-00-00-71.

Step 24: After receiving the loopback detection packet, each BIER switch selects the BIER forwarding table according to the address filtering table to forward the packet until the BIER switch 7 terminates the packet according to the destination MAC address of the loopback detection packet.

Since the BIER switch 4 is configured with the MIP, the BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2, and then the destination MAC address of the packet is 00-11-22-00-00-71 and the BIER switch 4 The IP address of the MIP1 is compared. The result of the comparison is that the destination MAC address of the packet is inconsistent with the address of the MIP1. Therefore, the BIER switch 4 will continue to forward the loopback detection packet, that is, based on the destination MAC address of the packet. 11-22-00-00-71 finds the address filtering table and selects the BIER forwarding according to the address filtering table. Then, the BIER switch 4 forwards the packet based on the BIER tag and the bit mask carried in the packet, and sends it to the next BIER. Jump BIER switch 7.

Embodiment 3

5 is a schematic diagram of an implementation of loopback detection in a BIER Layer 2 network according to Embodiment 3 of the present disclosure. As shown in FIG. 5, the BIER Layer 2 network includes 16 BIER switches, and the 16 BIER switches are respectively BIER switches. BIER switch 2, BIER switch 3, BIER switch 4, BIER switch 5, BIER switch 6, BIER switch 7, BIER switch 8, BIER switch 9, BIER switch 10, BIER switch 11, BIER switch 12, BIER switch 13, BIER switch 14. BIER switch 15 and BIER switch 16; the above 16 BIER switches are switches that support both BIER forwarding and MAC forwarding, and arrive at BIER from BIER switch 1 through BIER switch 2, BIER switch 4, BIER switch 7, BIER switch 11 The BIER-based forwarding transmission path of the switch 15 is the transmission path to be detected.

The network operator configures two MEPs 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; in addition, the network operator is on BIER switch 7 MIP1 for detecting the MAC forwarding table is configured on port 1.

In an implementation manner, the MAC forwarding-based loopback detection from MEP1 to MIP1 mainly includes the following steps:

Step 31: After the network operator configures the MIP1 for detecting the MAC forwarding table on the port 1 of the BIER switch 7, the BIER switch 7 notifies all other network nodes of the address of the MIP1 and the indication that the MIP1 is used to detect the MAC forwarding table.

Exemplarily, the address of MIP1 is the MAC address of port 1 of BIER switch 7 00-11-22-00-00-71, The BIER switch 7 can advertise the address of the MIP1 and the indication of the MIP1 for detecting the MAC forwarding table to other BIER switches in the BIER Layer 2 network through the OSPF protocol, or the IS-IS protocol, or other advertising protocols, where the address of the MIP1 is occupied. Six bytes, the indication that MIP1 uses to detect the MAC forwarding table occupies one bit.

Step 32: After receiving the MIP1 address advertised by the BIER switch 7 and the MIP1 indicating the MAC forwarding table, the BIER switch in the BIER Layer 2 network adds the MIP1 address to the address filtering table to make the MIP1 address. Corresponds to the MAC forwarding table.

Step 33: After the network operator initiates the loopback detection function of MEP1 to MIP1, MEP1 sends a loopback detection packet whose destination MAC address is MIP1 address 00-11-22-00-00-71.

Step 34: After receiving the loopback detection packet, each BIER switch selects a MAC forwarding table according to the address filtering table to forward the packet until the BIER switch 7 terminates the packet according to the destination MAC address of the loopback detection packet.

Specifically, after receiving the loopback detection packet sent by the MEP1, the BIER switch 2 searches the address filtering table based on the destination MAC address of the packet 00-11-22-00-00-71, and selects the MAC forwarding according to the address filtering table. The BIER switch 2 then forwards the packet based on the destination MAC address of the packet and sends it to its next hop BIER switch 4.

After receiving the loopback detection packet forwarded by the BIER switch 2, the BIER switch 4 searches the address filtering table based on the destination MAC address of the packet 00-11-22-00-00-71, and selects the MAC forwarding according to the address filtering table. The BIER switch 4 forwards the packet based on the destination MAC address of the packet and sends it to its next hop BIER switch 7.

Embodiment 4

6 is a schematic diagram of an embodiment of loopback detection in a BIER Layer 2 network according to Embodiment 4 of the present disclosure. As shown in FIG. 6, the BIER Layer 2 network includes 16 BIER switches, and the 16 BIER switches are respectively BIER switches. BIER switch 2, BIER switch 3, BIER switch 4, BIER switch 5, BIER switch 6, BIER switch 7, BIER switch 8, BIER switch 9, BIER switch 10, BIER switch 11, BIER switch 12, BIER switch 13, BIER switch 14. BIER switch 15 and BIER switch 16; the above 16 BIER switches are switches that support both BIER forwarding and MAC forwarding, and arrive at BIER from BIER switch 1 through BIER switch 2, BIER switch 4, BIER switch 7, BIER switch 11 The BIER-based forwarding transmission path of the switch 15 is the transmission path to be detected.

The network operator configures two MEPs on the transmission path to be detected. MEP1 is configured on port 1 of BIER switch 1, MEP2 is configured on port 1 of BIER switch 15, and network operator is on BIER switch 4 MIP1 for detecting the MAC forwarding table is configured on port 1, and MIP2 for detecting the MAC forwarding table is configured on port 1 of the BIER switch 7.

In an implementation manner, the MAC forwarding-based loopback detection from MEP1 to MIP2 mainly includes the following steps:

Step 41: After the network operator configures the MIP2 for detecting the MAC forwarding table on the port 1 of the BIER switch 7, the BIER switch 7 advertises the address of the MIP2 to all other network nodes of the BIER Layer 2 network and the MIP2 is used for The indication of the MAC forwarding table is detected; likewise, the BIER switch 4 also advertises the address of the MIP1 to all other network nodes of the BIER Layer 2 network and the indication that the MIP1 is used to detect the MAC forwarding table.

Here, the address of the MIP2 is the MAC address 00-11-22-00-00-71 of the port 1 of the BIER switch 7, and the BIER switch 7 can set the address of the MIP2 through the OSPF protocol, or the IS-IS protocol, or other notification protocol. And the indication that the MIP2 is used to detect the MAC forwarding table is advertised to other BIER switches in the network, where the address of the MIP2 occupies six bytes, and the indication that the MIP2 uses to detect the BIER forwarding table occupies one bit. The BIER switch 4 also uses the same method to advertise the address of MIP1 and the indication that MIP1 is used to detect the MAC forwarding table.

Step 42: After the BIER switch other than the BIER switch 7 in the BIER Layer 2 network receives the MIP2 address advertised by the BIER switch 7, and the MIP2 indicates the MAC forwarding table, the MIP2 address is added to the address filtering table to make the MIP2 address. Corresponds to the MAC forwarding table. Similarly, after the BIER switch other than the BIER switch 4 in the BIER Layer 2 network receives the MIP1 address advertised by the BIER switch 4 and the MIP1 is used to detect the MAC forwarding table, the MIP1 address is added to the address filtering table to make the MIP1 address. Corresponds to the MAC forwarding table.

Step 43: After the network operator initiates the loopback detection function of MEP1 to MIP2, MEP1 sends a loopback detection packet whose destination MAC address is MIP2 address 00-11-22-00-00-71.

Step 44: After receiving the loopback detection packet, each BIER switch selects a MAC forwarding table according to the address filtering table to forward the packet until the BIER switch 7 terminates the packet according to the destination MAC address of the loopback detection packet.

Since the BIER switch 4 is configured with the MIP, the BIER switch 4 receives the loopback detection packet forwarded by the BIER switch 2, and then the destination MAC address of the packet is 00-11-22-00-00-71 and the BIER switch 4 The IP address of the MIP1 is compared. The result is that the destination MAC address of the packet is inconsistent with the address of the MIP1. Therefore, the BIER switch 4 will continue to forward the loopback detection packet, that is, based on the destination MAC address of the packet. -22-00-00-71 searches the address filtering table and selects MAC forwarding according to the address filtering table. Then, the BIER switch 4 forwards the packet based on the destination MAC address of the packet and sends it to its next hop BIER switch 7.

Embodiment 5

For the loopback detection device of the Layer 2 network of the foregoing embodiment of the present disclosure, the embodiment of the present disclosure further proposes a Layer 2 network.

Any one of the network nodes of the Layer 2 network is configured to go to the second layer after configuring the maintenance intermediate point MIP for detecting the bit index explicitly copying the BIER forwarding table or the MIP for detecting the medium access control MAC forwarding table. All other network nodes in the network send a MIP address for detecting the BIER forwarding table or a MIP address for detecting the MAC forwarding table;

The maintenance endpoint MEP in the Layer 2 network is used to initiate the loopback detection function of the MEP to the target MIP. The loopback detection packet carrying the target MIP address is sent out;

Further, any one of the network nodes of the Layer 2 network is further configured to: after receiving the loopback detection message, when the address of the MIP configured by the network node is consistent with the target MIP address, The loopback detection message is described.

Further, any one of the network nodes in the Layer 2 network is further configured to: when receiving the MIP address for detecting the BIER forwarding table, add the received MIP address to the address filtering table, and receive the received MIP. The address is configured as a MIP address forwarded based on the BIER forwarding table; when receiving the MIP address for detecting the MAC forwarding table, the received MIP address is added to the address filtering table, and the received MIP address is configured to be based on the MAC address. Publish the forwarded MIP address;

Here, the MIP located on the same loopback detection message transmission path is configured as a MIP for detecting the BIER forwarding table or a MIP for detecting the MAC forwarding table.

Here, the address of the target MIP is the unicast MAC address of the port where the target MIP is located.

In practical applications, any one of the network nodes in the Layer 2 network may be a device that supports both BIER forwarding and MAC forwarding.

Those skilled in the art will appreciate that embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions are provided for implementing one or more blocks in a flow or a flow and/or block diagram of the flowchart The steps of the function specified in the box.

The above description is only for the preferred embodiments of the present disclosure, and is not intended to limit the scope of the disclosure.

Claims

A loopback detection method for a layer 2 network, where the method includes:

Any one of the network nodes in the Layer 2 network is configured to detect the bit intermediate to explicitly copy the maintenance intermediate point MIP of the BIER forwarding table or the MIP for detecting the medium access control MAC forwarding table, and then to all the remaining networks in the Layer 2 network. The node sends a MIP address for detecting a BIER forwarding table or a MIP address for detecting a MAC forwarding table;

After the loopback detection function of the maintenance MIP to the target MIP is started, the MEP sends a loopback detection packet carrying the target MIP address.

After receiving the loopback detection message, the network node does not configure the MIP on the network node, or the configured MIP address is inconsistent with the target MIP address, according to the target. The MIP address performs forwarding based on the BIER forwarding table or forwarding based on the MAC forwarding table on the loopback detection message.
The method according to claim 1, wherein the method further comprises: after receiving the loopback detection message, any one of the network nodes in the layer 2 network has an address of a MIP configured on the network node. When the target MIP addresses are the same, the loopback detection packet is terminated.
The method of claim 1 wherein the method further comprises:

When receiving the MIP address for detecting the BIER forwarding table, any one of the Layer 2 networks adds the received MIP address to the address filtering table, and configures the received MIP address to be based on the BIER forwarding table. Forwarding MIP address; when receiving the MIP address for detecting the MAC forwarding table, any one of the Layer 2 networks adds the received MIP address to the address filtering table, and configures the received MIP address. MIP address forwarded based on the MAC forwarding table;

Correspondingly, the loopback detection packet is forwarded based on the BIER forwarding table or forwarded based on the MAC forwarding table according to the target MIP address, and includes:

The network node selects the BIER forwarding table based forwarding or the MAC forwarding table based forwarding by comparing the target MIP address with the MIP address in the address filtering table.
The method according to claim 1, wherein the method further comprises: simultaneously configuring the MIP located on the same loopback detection message transmission path as a MIP for detecting a BIER forwarding table or for detecting a MAC forwarding table. MIP.
The method of claim 1, wherein the address of the target MIP is a unicast MAC address of a port where the target MIP is located.
A Layer 2 network, wherein any one of the Layer 2 networks is configured to maintain a maintenance intermediate point MIP for detecting a bit index explicit copy BIER forwarding table or for detecting a medium access control MAC switch After the published MIP, the MIP address for detecting the BIER forwarding table or the MIP address for detecting the MAC forwarding table is sent to all the remaining network nodes in the Layer 2 network;

The maintenance endpoint MEP in the Layer 2 network is configured to send a loopback detection packet carrying the target MIP address after the loopback detection function of the MEP to the target MIP is started.

Any one of the network nodes in the Layer 2 network is configured to be in the network after receiving the loopback detection packet. When the node is not configured with the MIP, or the configured MIP address is inconsistent with the target MIP address, the loopback detection packet is forwarded based on the BIER forwarding table or forwarded based on the MAC forwarding table according to the target MIP address.
The apparatus according to claim 6, wherein any one of the network nodes of the Layer 2 network is further configured to: after receiving the loopback detection message, an address of the MIP configured at the local network node and the When the destination MIP addresses are the same, the loopback detection packet is terminated.
The apparatus according to claim 6, wherein any one of the layer 2 networks is further configured to add the received MIP address to the address filtering when receiving the MIP address for detecting the BIER forwarding table. The table, and the received MIP address is configured as a MIP address forwarded based on the BIER forwarding table; when receiving the MIP address for detecting the MAC forwarding table, the received MIP address is added to the address filtering table, and will be received The MIP address is configured to be based on the MIP address forwarded by the MAC forwarding table;

Correspondingly, any one of the network nodes in the layer 2 network is configured to perform the BIER-based selection of the loopback detection message by comparing the target MIP address with the MIP address in the address filtering table of the local network node. Published forwarding or forwarding based on MAC forwarding table.
The apparatus according to claim 6, wherein the MIP located on the same loopback detection message transmission path is simultaneously configured as a MIP for detecting a BIER forwarding table or a MIP for detecting a MAC forwarding table.
The apparatus of claim 6, wherein the address of the target MIP is a unicast MAC address of a port where the target MIP is located. .
A computer storage medium storing execution instructions for performing the method of any one of claims 1 to 5.