CN115604054A - Method and equipment for forwarding message by common link of resilient packet ring - Google Patents

Abstract

The present application provides a method and equipment for forwarding messages on a shared link of a resilient packet ring, the method comprising: setting the RPR MAC address of a neighboring intersecting node as the peer node RPR MAC address of the shared link; setting the RPR MAC address on the shared RPR ring Shared port; set the redundant shared channel between the RPR shared ring and the RPR intersecting ring; set the redirection entry that redirects the packet whose shared port is the outgoing port to the redundant common channel; when the RPR unicast data to be forwarded The outgoing port of the message is a common port, and the RPR unicast data message to be forwarded is transferred from the RPR common ring to the RPR intersecting ring through the redirection table entry; the RPR unicast data message to be forwarded is encapsulated with the specified VLAN and the destination RPR The MAC address is the outer RPR header of the MAC address of the peer node of the shared link; it is sent through the shortest path to the neighbor intersecting node on the RPR intersecting ring.

Description

A method and device for forwarding messages on a shared link of a resilient packet ring

technical field

The present application relates to RPR technology, in particular to a method and device for forwarding messages on a shared link of RPR.

Background technique

RPR (Resilient Packet Ring) is a new MAC (Media Access Control) protocol that can run on SONET (Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy) , DWDM (Dense Wavelength Division Multiplexing, Dense Wavelength Division Multiplexing) and Ethernet, providing flexible and efficient networking solutions for broadband IP MAN operators. RPR adopts RPR MAC layer frame encapsulation to realize transparent transmission of Ethernet Over RPR. The ring structure and topology protection mechanism of RPR are transparent to the forwarding process of carried traffic and access devices.

In a single RPR ring, the direction in which RPR nodes send RPR data packets in the clockwise direction is Ring 0, also called the Outer Ring (outer ring); the direction in which RPR nodes send RPR packets in the counterclockwise direction is Ring 1, also called Called Inner Ring (inner ring). The RPR node sends RPR data packets on ring 0 and receives RPR data packets on ring 1 through the eastbound physical port; receives RPR data packets on ring 0 and sends RPR data packets on ring 1 through the westbound physical port .

The east-west physical ports and west-bound physical ports of each RPR node form the RPR logical port. In the RPR node, each switching unit is interconnected with each RPR processing unit through an internal physical Ethernet port Internal Port A).

At present, different RPR rings are evolved on the basis of a single RPR ring to form an RPR intersecting ring network, and different RPR rings in the RPR intersecting ring network intersect at two RPR nodes.

Contents of the invention

The purpose of this application is to provide a method and device for forwarding messages on a shared link of an RPR, in which a physical link between intersecting nodes in one RPR sub-ring bears traffic of intersecting nodes on other RPR sub-rings.

In order to achieve the above object, the present application provides a method for forwarding messages on a shared link of an RPR, the method comprising: setting the RPR MAC address of the neighbor intersecting node as the peer node RPR MAC address of the shared link; setting the RPR shared The shared port on the ring is used for ports not connected to neighbor intersecting nodes; the RPR shared ring is set as a redundant shared channel between the RPR shared ring and the RPR intersected ring; Shared port redirection entries of other common channels; when the outgoing port of the RPR unicast data message to be forwarded is a shared port, the RPR unicast data message to be forwarded is transmitted from the RPR shared ring through the shared port redirection table entry To the RPR intersecting ring; encapsulate the outer RPR header with the specified VLAN and the destination RPR MAC address as the peer node MAC address of the shared link for the RPR unicast data packet to be forwarded; reach the neighbor intersecting node through the RPR intersecting ring The RPR port on the shortest path sends the RPR unicast data packet with the outer RPR header.

In order to achieve the above purpose, the present application also provides a device for forwarding messages on a shared link of an elastic packet ring, the device includes a processor and a memory; the memory is used to store instructions executable by the processor; wherein, the processor runs the memory The processor in the processor can execute instructions to perform the following operations: set the RPR MAC address of the neighbor intersecting node as the peer node RPR MAC of the shared link; set the shared port on the RPR shared ring for not connecting the neighbor intersecting node The port RPR shared ring; set the redundant shared channel between the RPR shared ring and the RPR intersecting ring; set the shared port redirection table entry that redirects the packets with the shared port as the outgoing port to the redundant shared channel; when waiting The outgoing port of the forwarded RPR unicast data message is a shared port, and the RPR unicast data message to be forwarded is transferred from the RPR shared ring to the RPR intersecting ring through the shared port redirection entry; the RPR unicast data message to be forwarded is The message encapsulates the outer RPR header with the specified VLAN and the destination RPR MAC address is the MAC address of the peer node of the shared link; the outer RPR header is sent through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring. The RPR unicast data packet with the header; the traffic of the intersecting nodes on other RPR subrings is carried by the physical link between the intersecting nodes in one RPR subring.

The beneficial effect of the present application is that the traffic between intersecting nodes on the RPR shared ring is carried by the intersecting ring, which is beneficial to the application of the networking of the RPR intersecting ring network.

Description of drawings

Fig. 1 is the flowchart of the method embodiment of the shared link forwarding message of RPR provided by the present application;

2A-2B are internal schematic diagrams of intersection nodes provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of a shared link of an RPR intersecting ring network provided by an embodiment of the present application;

FIG. 4 is an internal schematic diagram of the shared link of the intersecting nodes of the RPR intersecting ring network provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of an embodiment of a shared link forwarding device providing a resilient packet ring in the present application.

detailed description

A detailed description will be given with a plurality of examples shown in a plurality of drawings. In the following detailed description, numerous specific details are used to provide a thorough understanding of the application. Well-known methods, procedures, components and circuits have not been described in detail in order not to obscure the examples.

Among the terms used, the term "comprising" means including but not limited to; the term "comprising" means including but not limited to; the terms "above", "within" and "below" include the number; the terms "greater than" and "less than" mean not Include this number. The term "based on" means based on at least a portion thereof.

Fig. 1 is the flow chart of the method embodiment of the shared link forwarding message of RPR that the application provides; This embodiment comprises:

Step 101, setting the RPR MAC address of the neighbor intersecting node as the peer node RPR MAC of the shared link;

Step 102, setting a shared port on the RPR shared ring to be used for an RPR shared ring not connected to a port of a neighboring intersecting node;

Step 103, setting a redundant shared channel between the RPR shared ring and the RPR intersecting ring;

Step 104, setting the common port redirection table item that redirects the message that the shared port is the outgoing port to the redundant common channel;

Step 105, when the outgoing port of the RPR unicast data message to be forwarded is a shared port, the RPR unicast data message to be forwarded is transferred from the RPR shared ring to the RPR intersecting ring through the shared port redirection entry;

Step 106, encapsulating the RPR unicast data message to be forwarded with the outer layer RPR header with the specified VLAN and the destination RPR MAC address being the peer node RPR MAC address of the shared link;

Step 107: Send the RPR unicast data message with the outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring.

2A-2B are internal schematic diagrams of nodes A and B connected by a common link of intersecting rings.

Node A and Node B are configured in the shared physical link mode, and the westbound physical port of node A on the RPR ring 20 is configured as a shared port without connecting to the physical link; the eastbound physical port of node B on the RPR ring 20 is configured as a shared port without Connect the physical link.

Configure node A and node B as the peer node RPR MAC of the shared link to encapsulate the outer RPR bearer tunnel header according to the RPR MAC address of the peer node of the shared link as the destination RPR MAC address.

Configure the westbound physical port of node A on the RPR20 ring as a shared RPR port, and configure the westbound physical port of node B on the RPR20 ring as a shared RPR port.

In node A, configure the RPR forwarding channel and the redundant shared channel; wherein, the RPR forwarding channel includes the Internal Port 30 between the switch chip S1 and the RPR chip P1 and the Internal Port 32 between the switch chip S2 and the RPR chip P2; the redundant shared The channel includes an Internal Port 31 between the switch chip S1 and the RPR chip P1 and an Internal Port 32 between the switch chip S2 and the RPR chip P2.

In node B, configure the RPR forwarding channel and the redundant shared channel; wherein, the RPR forwarding channel includes the Internal Port 34 between the switch chip S3 and the RPR chip P3 and the Internal Port 36 between the switch chip S4 and the RPR chip P4; the redundant shared The channel includes an Internal Port 35 between the switch chip S3 and the RPR chip P3 and an Internal Port 37 between the switch chip S2 and the RPR chip P2.

When the switching chips S1-S4 of node A and node B receive the Ethernet message that needs to be connected to the ring, they send it to the connected RPR chip through the Internal Port30, 32, 34, and 36 of the RPR forwarding channel for RPR encapsulation and forwarding; A. When the RPR chip P1-P4 of node B receives the RPR data message that needs to be dropped, it sends it to the connected switching chip S1-S4 through the InternalPort30, 32, 34, and 36 of the RPR forwarding channel for RPR decapsulation and Ethernet forwarding.

When the RPR chips P1-P4 of node A and node B receive the RPR data message/RPR protocol message forwarded across intersecting rings, one of the RPR rings (such as RPR chip P1 , P3) The data accessed or the forwarded protocol message is sent across the ring to another intersecting ring (for example, RPR chips P2, P4).

The improvement point of the present application is that the RPR protocol message/data message between the node A and the node B on the RPR20 ring is transmitted through the link of the shared RPR10 ring through the redundant shared channel inside the node A and the node B, Realize cross-ring shared link forwarding.

In node A, the common port redirection entry is configured; the matching item is the westbound physical port whose outbound port is RPR ring 20, and the action item is sending to Internal Port31.

In node B, the common port redirection entry is configured; wherein, the matching item is the eastbound physical port whose egress port is the RPR ring 20, and the action item is sending to Internal Port34.

Figure 3 is a schematic diagram of the shared link of the RPR intersecting ring network provided by the present application; in the RPR intersecting ring network, the RPR ring 10 includes: node A-node B-node C-node D; the RPR ring 20 includes node A-node B-node E-Node F-Node G-Node H.

FIG. 4 is an internal schematic diagram of the common link of the intersecting nodes of the RPR intersecting ring network provided by the embodiment of the present application; there is no physical link connected on the RPR ring 20 between node A and node B. The traffic between node A and node B on the RPR ring 20 is carried by node A and node B through the RPR ring 10 .

Node A and Node B are intersection nodes of RPR rings 10 and 20 . RPR ring 10 is an RPR shared ring, and RPR logical ports of node A on RPR rings 10 and 20 are A10 and A20 respectively. On the RPR rings 10 and 20, the RPR logical ports of Node B are B10 and B20 respectively.

Configure multi-ring cross group 1 on node A, and configure RPR logical ports A10 and A20 to belong to multi-ring cross group 1; associate RPR logical port A10 with RPR ring 10 with ring priority 0; 20 is associated with RPR ring 20 with ring priority 1. Configure the RPR MAC address of the neighbor node of node A to be the RPR MAC address of node B, RPR MAC B; configure the intersecting group role of node A to be the primary node (Primary).

Configure multi-ring cross group 1 on node B, and configure RPR logical ports B10 and B20 to belong to multi-ring cross group 1; associate RPR logical port B10 with RPR ring 10 with ring priority 0; B20 is associated with RPR ring 20 with ring priority 1. Configure the RPR MAC address of Node B's neighbor node as RPR MAC A of Node A; configure the intersecting group role of Node B as Secondary.

In this embodiment, ring priority 0 represents the highest priority, and the priority of ring priority 1 decreases step by step.

Node A sends a topology collection protocol message whose source RPR MAC is RPR MAC A on the two RPR rings, which carry the multi-ring cross group identifier multi-ring cross group 1 and the ring priority.

Node A sends a topology collection protocol packet through the westbound physical port or eastbound physical port of the RPR10 ring. After receiving the topology collection protocol packet sent by node A on RPR ring 10, node B can learn the RPR ring 10 configured on node A. priority. Similarly, node B sends a topology collection protocol packet through the westbound physical port or eastbound physical port of the RPR10 ring. After receiving the topology collection protocol message sent by node B on RPR ring 10, node A can learn the RPR configured on node B. The priority of ring 10.

When node A sends a topology collection protocol packet through the westbound physical port of the RPR20 ring, node A sends the topology collection protocol packet to the switch chip S1 through Internal Port 31 based on the shared port redirection entry, and the switch chip S1 is based on the configured redundancy The remaining shared channel Internal Port33 sets the inter-chip output port of the topology protocol message to Internal Port 33, and sends the topology collection protocol message of the chip output port Internal Port33 with the redundant shared channel to the switch chip S2 through the switch chip.

Because between the communication devices of the multi-service board, the switching chips synchronize their respective chip port information; when the Internal Port 31 and 33 of the redundant shared channel are configured, the switching chips S1 and S2 can realize redundancy based on the synchronized chip port information. The rest of the transfers within the shared channel.

The switch chip S2 of node A receives the redundant topology protocol, strips off the chip output port Internal Port33 of the redundant shared channel, and sends the topology collection protocol to the RPR chip P2 through Internal Port33.

Node A redirects the RPR protocol packet that needs to be sent through the westbound physical port of the RPR20 ring to the redundant shared channel through the shared port redirection entry, and transfers the protocol message originally forwarded through the RPR20 ring across the ring through the redundant shared channel to the RPR10 ring.

The RPR chip P2 of node A receives the topology collection protocol through Internal Port33 of the redundant shared channel, and adds an RPR tunnel header with a specified VLAN; the source RPR MAC is the RPR MAC of node A, and the destination RPR MAC is the RPRMAC of node B; , share the peer node RPR MAC of the link.

Node A sends the topology collection protocol packet with the outer RPR tunnel header through the westbound physical port on the RPR ring 10 .

Node B receives the topology collection protocol packet with the outer RPR tunnel header through the eastbound physical port of RPR ring 10, strips the outer tunnel header according to the specified VLAN and destination RPR MAC address, and passes through InternalPort36 of the redundant common channel send.

The switching chip S4 of the node B sets the inter-chip output port of the topology protocol message to Internal Port 36 based on the Internal Port36 of the redundant shared channel configured, and the internal port of the chip with the redundant shared channel is set to Internal Port36 through the switching chip S4. The topology collection protocol message is sent to the switch chip S3.

The switch chip S3 of node B receives the redundant topology protocol, strips off the chip output port Internal Port36 of the redundant shared channel, and sends the topology collection protocol to the RPR chip P3 through Internal Port35.

The node B transmits the redundancy protocol message of the RPR20 ring forwarded by the RPR10 ring to the RPR20 ring across rings through the redundant shared channel. After node B receives the topology collection protocol sent by node A on the RPR ring 10, it can learn the priority of the RPR ring 10 configured on node A.

In the example shown in Figure 2 and Figure 3, when node A and node B send the topology collection protocol message through the east and west physical ports of the RPR20 ring respectively, node A does not need to send the topology collection protocol message of the RPR20 ring through RPR ring 10 to Node B, and the RPR chip 3 of the RPR20 ring of the node B transmits the topology collection protocol message to the RPR chip 4 through the shared port redirection entry through the redundant shared channel. Node B receives the topology collection protocol message through the redundant shared channel, adds the outer layer RPR header with the specified VLAN, and passes the shortest path from node B to node A on the RPR ring (the east direction of the RPR10 ring of node B in Figure 2 The physical port is connected to the westbound physical port of the RPR10 ring of node A) to send to node A. RPR chip 2 of node A receives the RPR packet with the specified VLAN, removes the outer RPR header, and sends it to RPR chip 1 through the redundant common channel.

Node A and Node B elect the RPR ring 10 with the highest priority as the main ring, and determine the RPR ring 20 with the lower priority as the sub-ring. Node A and node B respectively set the RPR logical port A0 and the RPR logical port B0 on the main ring to the forwarding (Forward) state. The master node A of multi-ring cross group 1 sets the RPR logical port A1 of the sub-ring of the local device to the forwarding state. The slave node B of multi-ring cross group 1 sets the RPR logical port B1 of the sub-ring of the local device as blocking.

When data packets passing through the RPR nodes on the RPR10 ring and RPR20 ring need to be forwarded across rings, the RPR data packets are sent to the master node A on the respective RPR rings according to the existing method, and the master node A performs cross-ring forwarding. The ring forwarding is not repeated in this application.

The improvement point of this application is that when the RPR data message on the RPR20 ring needs to be forwarded between nodes A and B, when node A receives the RPR data message through the eastbound physical port of the RPR ring 20 or receives the local In the case of an RPR data message, when the destination MAC address is the RPR MAC address of node E, it is sent from the westbound physical port of the RPR20 ring according to the collected topology of the RPR20 ring.

Node A sends the RPR data packet of the RPR20 ring to the redundant shared channel according to the shared port redirection table entry, sends it to the RPR10 ring through the redundant shared channel, and adds the RPR data packet with the specified VLAN and the destination RPR MAC address as the address of RPR B. The outer RPR header is sent by the shortest path on the RPR20 ring through the shared link of node A, that is, the westbound physical port of node A on the RPR10 ring in Figure 3 .

Node B receives the RPR packet with the specified VLAN, strips off the outer RPR header, and sends it to the RPR20 ring through the redundant shared channel. Node B receives the data message of the RPR20 ring through the redundant shared channel, and learns the RPR MAC address according to the shared port, that is, the eastbound physical port of the RPR20 ring, and the source RPR MAC address.

Then, Node B looks up the RPR MAC address entry according to the destination RPR MAC address. When the destination RPR MAC address is RPR MACB, the RPR encapsulation is stripped off, and forwarded according to the destination MAC address of the inner layer Ethernet message (transmitting the switch chip through InternalPort34 of RPR3 S3, after the switching chip S3 peels off the RPR encapsulation, it forwards according to the outgoing port corresponding to the destination MAC address of the inner layer Ethernet message); when the destination RPR MAC address is the RPR MAC address of other nodes of the RPR20 ring (such as node E) , it is sent through the path to other nodes on the RPR20 ring.

When the RPR data packet received by node B needs to be sent to node A, the RPR data packet whose egress port is the eastbound physical port on the RPR20 ring is redirected to the redundant shared channel through the same mechanism. The RPR data message forwards the data message of the RPR20 ring to the RPR10 ring, adds the outer RPR header with the specified VLAN and the destination RPR MAC address as the RPR A address, and sends it on the shortest path on the RPR20 ring through the shared link of Node B , that is, the eastbound physical port of node A on the RPR10 ring in Figure 3.

If the link between node A and node B on the RPR10 ring is broken in Figure 3, the shortest path from node B to node A on the RPR10 ring is the westbound physical port.

Node A receives the RPR packet with the specified VLAN from the westbound physical port or eastbound physical port of the RPR10 ring, strips off the outer RPR header, and sends it to the RPR20 ring through the redundant shared channel. Node B receives the data message of the RPR20 ring through the redundant shared channel, and learns the RPR MAC address according to the shared port, that is, the eastbound physical port of the RPR20 ring, and the source RPR MAC address.

Then, node A looks up the RPR MAC address entry according to the destination RPR MAC address. When the destination RPR MAC address is RPR MACA, it strips off the RPR encapsulation, and forwards the packet according to the destination MAC address of the inner layer Ethernet packet (transmitting the switch chip through InternalPort30 of RPR1 S1, after the switching chip S1 peels off the RPR encapsulation, it forwards according to the outgoing port corresponding to the destination MAC address of the inner layer Ethernet message); when the destination RPR MAC address is the RPR MAC address of other nodes of the RPR20 ring (such as node H) , it is sent through the westbound RPR port of the path to other nodes on the RPR20 ring.

When node A sends an RPR non-unicast data message (multicast/broadcast) on the RPR20 ring, it sends it through the eastbound physical port and the westbound physical port of the RPR ring 20, and transmits the RPR non-unicast message of the RPR20 ring through the shared port Redirect to the redundant shared channel, pass it to the RPR10 ring through the redundant shared channel, add the outer RPR header of the specified VLAN and RPR MACB (the peer node RPR MAC address of the shared link), and send it to the RPR10 ring through the shortest path Node B.

Node B receives the RPR non-unicast data message with the specified VLAN, strips the outer RPR header, and transmits it to the RPR20 ring through the redundant common channel. Node B receives the RPR non-unicast message through the redundant common channel, and confirms that the incoming interface of the RPR non-unicast message is a common port, and then sends it through the westbound physical port of the RPR20 ring.

2A-2B , FIG. 3 , and FIG. 4 described above, the RPR protocol packets and RPR data packets sharing the RPR20 ring can be carried and forwarded through the links of the intersecting RPR10 rings.

In the existing RPR intersecting rings, each RPR ring is independently networked. Between the two intersection points, each node of each ring needs an independent interconnection physical link, usually an optical fiber; the laying of optical fiber resources is generally relatively nervous. If only a section of optical fiber is laid between the intersecting nodes of the intersecting ring network, on a certain RPR ring in the intersecting ring network (such as the RPR20 ring in Figure 3 and Figure 4), there is no directly connected optical fiber between the intersecting nodes, resulting in the Data packets and protocol packets on the RPR ring can only be forwarded in one direction. Once one of the nodes fails, the forwarding of traffic and protocol packets on the RPR ring will be interrupted.

In this application, the traffic between intersecting nodes on the RPR shared ring is carried by the intersecting ring, which is more conducive to the application of the networking of the RPR intersecting ring network.

Fig. 5 is a schematic diagram of an embodiment of a shared link forwarding device providing a resilient packet ring in the present application. The device 50 includes a processor and a memory; the memory is used to store processor-executable instructions; wherein, the processor executes the processor-executable instructions in the memory to perform the following operations: set the RPR MAC address of the neighbor intersection node as a shared link RPR MAC of the peer node of the road; set the port connected to the neighbor intersecting node on the RPR shared ring as the shared port; set the redundant shared channel between the RPR shared ring and the RPR intersecting ring; set the shared port as the outgoing port Redirect to the shared port redirection entry of the redundant common channel; when the outgoing port of the RPR unicast data packet to be forwarded is a shared port, the RPR unicast data packet to be forwarded is redirected from the The RPR shared ring is passed to the RPR intersecting ring; the RPR unicast data packet to be forwarded is encapsulated with the first outer RPR header with the specified VLAN and the destination RPR MAC address is the MAC address of the peer node of the shared link; through RPR intersecting The RPR port on the shortest path to the neighbor intersecting node on the ring sends the RPR unicast data packet with the first outer RPR header.

The processor also performs the following operations by running the processor-executable instructions in the memory: receiving the RPR unicast data message with the second outer RPR header through the RPR port on the shortest path to the neighboring intersecting node on the RPR intersecting ring; Among them, the second outer layer RPR header has the specified VLAN and the destination RPR MAC address is the RPR MAC address of the device; the second outer layer RPR header is stripped to obtain the inner layer RPR unicast data packet; the inner layer RPR unicast data packets are sent from the RPR intersecting ring to the RPR shared ring; learn the RPR MAC address entry according to the shared port and the source RPR MAC address of the inner RPR unicast data packet; The PRRM MAC address entry matching the destination RPR MAC address is forwarded.

The processor also performs the following operations by running the processor-executable instructions in the memory: when the outgoing port of the RPR non-unicast data message to be forwarded is a shared port, the RPR non-unicast data message to be forwarded is redirected to the The data message is transferred from the RPR shared ring to the RPR intersecting ring; for the RPR non-unicast data message to be forwarded, the third outer RPR with the specified VLAN and the destination RPR MAC address is the MAC address of the peer node of the shared link header; the RPR non-unicast data message with the third outer RPR header is sent through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring.

The processor also performs the following operations by running the processor-executable instructions in the memory: receiving the RPR non-unicast data message with the fourth outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring ; Among them, the fourth outer layer RPR header has the specified VLAN and the destination RPR MAC address is the RPR MAC address of the device; the fourth outer layer RPR header is stripped to obtain the inner layer RPR non-unicast data message; The inner non-RPR unicast data message is sent from the RPR intersecting ring to the RPR shared ring; the inbound interface of the inner RPR unicast data message in the RPR shared ring is determined as a shared port; through another RPR port on the RPR shared ring Send inner layer RPR non-unicast data packets.

The above are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims (8)

1. A method for forwarding messages of a shared link of an RPR, characterized in that the method comprises: Set the RPR MAC address of the neighbor intersecting node as the RPR MAC of the peer node of the shared link; setting the shared ports on the RPR shared ring to be used for ports not connected to the neighbor intersection nodes; A redundant shared channel is set between the RPR shared ring and the RPR intersecting ring; Setting the shared port redirection table entry that redirects the packet that uses the shared port as the outgoing port to the shared port of the redundant common channel; When the outgoing port of the RPR unicast data message to be forwarded is the shared port, transfer the RPR unicast data message to be forwarded from the RPR shared ring to the shared port through the shared port redirection entry RPR intersection ring; Encapsulating the RPR unicast data message to be forwarded with a first outer layer RPR header with a designated VLAN and a destination RPR MAC address being the RPR MAC address of the peer node of the shared link; sending the RPR unicast data packet with the first outer RPR header through the RPR port on the shortest path to the neighboring intersecting node on the RPR intersecting ring. 2. The method of claim 1, further comprising, Receive the RPR unicast data message with the second outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring; wherein, the second outer RPR header contains the specified VLAN and the destination RPR MAC address is the RPR MAC address of the device; Stripping off the second outer layer RPR header to obtain an inner layer RPR unicast data message; sending the inner layer RPR unicast data message from the RPR intersecting ring to the RPR shared ring through the redundant common channel; Learning an RPR MAC address entry according to the shared port and the source RPR MAC address of the inner layer RPR unicast data message; Find the PRRM MAC address table entry matching the destination RPR MAC address of the inner layer RPR unicast data message and perform forwarding. 3. The method of claim 1, further comprising, When the outgoing port of the RPR non-unicast data message to be forwarded is the shared port, transfer the RPR non-unicast data message to be forwarded from the RPR shared ring to said RPR intersects rings; Encapsulating the RPR non-unicast data message to be forwarded with a third outer layer RPR header with a specified VLAN and the destination RPR MAC address being the peer node MAC address of the shared link; sending the RPR non-unicast data packet with the third outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring. 4. The method according to claim 1, wherein the method further comprises: Receive the RPR non-unicast data packet with the fourth outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring; wherein, the fourth outer RPR header contains the Specify the VLAN and the destination RPR MAC address is the RPR MAC address of the device; Stripping off the fourth outer layer RPR header to obtain the inner layer RPR non-unicast data message; sending the inner non-RPR unicast data message from the RPR intersecting ring to the RPR shared ring through the redundant common channel; Determining that the inbound interface of the inner layer RPR unicast data message on the RPR shared ring is the shared port; sending the inner RPR non-unicast data packet through another RPR port of the RPR shared ring. 5. A device for forwarding messages on a shared link of an RPR, characterized in that the device includes a processor and a memory; the memory is used to store processor-executable instructions; wherein the processor runs The processor executable instructions in the memory are used to perform the following operations: Set the RPR MAC address of the neighbor intersecting node as the RPR MAC of the peer node of the shared link; Setting the shared port on the RPR shared ring for the RPR shared ring not connected to the port of the neighbor intersecting node; A redundant shared channel is set between the RPR shared ring and the RPR intersecting ring; Setting the common port redirection table entry that redirects the packet whose shared port is the outgoing port to the redundant common channel; When the outgoing port of the RPR unicast data message to be forwarded is the shared port, transfer the RPR unicast data message to be forwarded from the RPR shared ring to the shared port through the shared port redirection entry RPR intersection ring; Encapsulating the RPR unicast data message to be forwarded with a first outer layer RPR header with a designated VLAN and a destination RPR MAC address being the peer node RPR MAC address of the shared link; sending the RPR unicast data packet with the first outer RPR header through the RPR port on the shortest path to the neighboring intersecting node on the RPR intersecting ring. 6. The device of claim 5, wherein the processor further performs the following operations by executing the processor-executable instructions in the memory: Receive the RPR unicast data message with the second outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring; wherein, the second outer RPR header contains the specified VLAN and the destination RPR MAC address is the RPR MAC address of the device; Stripping off the second outer layer RPR header to obtain an inner layer RPR unicast data message; sending the inner layer RPR unicast data message from the RPR intersecting ring to the RPR shared ring through the redundant common channel; Learning an RPR MAC address entry according to the shared port and the source RPR MAC address of the inner layer RPR unicast data message; Find the PRRM MAC address table entry matching the destination RPR MAC address of the inner layer RPR unicast data message and perform forwarding. 7. The device of claim 5, wherein the processor further performs the following operations by executing the processor-executable instructions in the memory: When the outgoing port of the RPR non-unicast data message to be forwarded is the shared port, transfer the RPR non-unicast data message to be forwarded from the RPR shared ring to said RPR intersects rings; Encapsulating the RPR non-unicast data message to be forwarded with a third outer layer RPR header with a specified VLAN and the destination RPR MAC address being the peer node MAC address of the shared link; sending the RPR non-unicast data packet with the third outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring. 8. The device of claim 5, wherein the processor further performs the following operations by executing processor-executable instructions in the memory: Receive the RPR non-unicast data packet with the fourth outer RPR header through the RPR port on the shortest path to the neighbor intersecting node on the RPR intersecting ring; wherein, the fourth outer RPR header contains the Specify the VLAN and the destination RPR MAC address is the RPR MAC address of the device; Stripping off the fourth outer layer RPR header to obtain the inner layer RPR non-unicast data message; sending the inner layer non-RPR unicast data message from the RPR intersecting ring to the RPR shared ring through the redundant common channel; Determining that the inbound interface of the inner layer RPR unicast data message on the RPR shared ring is the shared port; Sending the inner layer RPR non-unicast data message through another RPR port on the RPR shared ring.

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