WO2010031211A1

WO2010031211A1 - Method for control channel configuration and message transmission in ethernet multiring network

Info

Publication number: WO2010031211A1
Application number: PCT/CN2008/002122
Authority: WO
Inventors: 王斌; 吴少勇
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-09-19
Filing date: 2008-12-29
Publication date: 2010-03-25
Also published as: CN101677281B; CN101677281A

Abstract

A method for the control channel configuration and the message transmission in the Ethernet multiring network is provided, and the method is applied to the Ethernet ring network consisting of the tangent or intersect ring and subring. The method includes the following steps that: the control channel of the ring is configured so that the control channel of the ring contains all the ports over the ring, wherein the protocol messages of the control channel of the ring only propagate in the ring; the control channel of the subring is configured so that the control channel of the subring contains all the ports over the subring and all the ports over the ring, wherein the protocol messages of the control channel of the subring not only propagate in the subring, but also propagate in the ring by passing through the interconnection nodes between the ring and the subring; and the ports of the ring protecting link control nodes of the ring and the subring which connect with the ring protecting link open or block the forwarding function of the data messages and the forwarding function of the protocol messages of the control channel of the subring simultaneously.

Description

Control channel configuration with too many ring networks and message transmission method thereof

Technical field

The present invention relates to the field of data communications, and more particularly to a control channel configuration with too many ring networks and a message transmission method thereof.

Background technique

In the practical application of Ethernet, various protection technologies are widely used to implement redundant backup between the primary path and the standby path. When the primary path and the alternate path are both intact, the protected data forwarding function of the alternate path is blocked, and the protection data between the networks is transmitted on the primary path; when the primary path fails, the protected data forwarding function of the alternate path is opened, and the network The protection data is switched to the alternate path for transmission, to prevent the protection data from being repeatedly received and to form a broadcast storm under the normal state of the network, and to enable the alternate path transmission protection data when the primary path of the network fails, thereby improving the anti-fault of the Ethernet. Capability, and meet the high real-time requirements of convergence time less than 50ms when switching.

For example, Ethernet multi-ring protection technology, as shown in Figure la, nodes S1 to S6 are all Ethernet switches, network B and node S2 are connected, and network A and node S5 are connected. Communication between Network A and Network B. There are four physical paths between network A and network B, namely: network A<-> node 85<一> node S3<-> node S2<-> network B, network A<-> node S5<-> node S3< —> Node S4<—> Node Sl<—> Node 82<—> Network 8, Network A<-> Node S5<-> Node S6<-> Node S4<-> Node S3<-> Node S2<-> Network B, Network A<-> Node S5<-> Node S6<-> Node S4<-> Node Sl<-> Node 82<-> Network 8.

For Ethernet multi-ring protection technology, standards that are being developed internationally (such as ITU G.8032) believe that a ring with too many rings should contain rings and sub-rings, that is, ring is a complete etheric ring. Sub-Ring is an Ethernet ring connected to other rings or networks through an Interconnection Node. An Interconnection Node is a common node that belongs to two or more Ethernet rings at the same time. As shown in FIG. 2a, the figure includes a ring and a subring, Ringl is a ring, and Rin _g 2 is a subring. The nodes included in Ringl are Sl, S2, S3 and S4, and the links included are: <S1, S2>, <S2, S3>, <S3, S4> and <S4, SI>; Ring 2 contains nodes with S3 , S5, S6 and S4, the links included are: <S3, S5>, <S5, S6> And <86, S4>. It is important to emphasize that the <S3, S4> link belongs to Ringl and not to Rin _g 2. In a ring network, when the ring network is fault-free, a link needs to have a link to block the forwarding of data packets to prevent looping. This link is generally called a ring protection link (or Often blocking the link, etc.), through this ring protection link to participate in the switching of the primary and protection paths in the ring. A node that has a ring protection link, referred to herein as a ring protection link control node. As shown in Figure 2a, in Ring 1, node S1 is a ring protection link control node, and the 11-port direct link of node S1 is Ringl's ring protection link. In Rin _g 2, node S6 is a ring protection link control node, and the 62-port direct link with node S6 is a ring protection link of Ring 2. Under normal circumstances, the ring protection link control nodes of Ringl and Ring2 block the forwarding of data packets (the data packets of the protection service) of the ports connected to the ring protection link, preventing the protection data from being repeatedly forwarded and forming a broadcast. When the link in the ring network is too good, the ring protection link control node of the ring and sub-ring blocks the protection data forwarding function of the slave port. As shown in Figure 2a, node S1 blocks the protected data forwarding function of port 11, and node S6 blocks the protected data forwarding function of port 62. The communication paths of network B and A are: network B<-> node S2<->S3 <—>S5<—> Network A.

When a link with too many ring networks fails, if the faulty link is not a ring protection link, the ring protection link control node opens the protection data forwarding function of the adjacent port of the ring protection link, and each node also needs to refresh the address. Forwarding table, communication between networks is transmitted according to the new path. As shown in FIG. 2b, the link between the nodes S2 and S3 on the ring Ring1 is faulty. After detecting the link fault, the node S2 blocks the data forwarding function of the port 22, and notifies other nodes that the link has failed. After receiving the fault notification, S1 opens the protected data forwarding function of port 11. In addition, each node on Ring1 also needs to refresh the address forwarding table. The new communication path of network B and A is: network B<-> node S2<-> node Sl<-> node S4<-> node S3<-> node 85<-> network.

When the link in too many ring networks recovers, the recovery switch is performed, and the network transmission returns to the normal transmission path. Because the path changes, the node also needs to refresh the address forwarding table.

When performing maintenance and protection switching with too many ring networks, a large number of control messages need to be transmitted. These control messages are propagated in the automatic protection control channel. The automatic protection control channel can be implemented by VLAN, but not limited to VLAN (virtual LAN) implementation, for example, can also be implemented with a multicast MAC (Media Access Control) address. In the example below, we use VLAN to implement automatic protection control letter. Road. There are two types of automatic protection control channels, one corresponding to the ring, called the control channel of the ring, and the other type is the control channel corresponding to the sub-ring, called the sub-ring.

In the conventional scheme, since there is no subring concept, the method of preparing the multi-loop control channel does not reflect the idea of the sub-ring. When each Ethernet ring transmits its own control message on its respective control channel, it will cause The generation of a data loop. As shown in Figure 3a, Ringl and Rin _g 2 are two Ethernet rings. Under the traditional scheme, they are all complete rings. The respective control channels are VLAN 3 and VLAN 4. Under this mechanism, when the shared link between Ringl and Ring2 fails, a new loop is formed between the Ringl and Ring2 links. As shown in Figure 3b, when the shared link <S3, S4> between Ringl and Ring2 fails, the fault protocol packets are forwarded independently in their respective rings, and the control nodes S1 and S6 of Ringl and Rin _g 2 are respectively. Both open the data forwarding function of the slave port, Ringl and Ring2 form a new loop: Node Sl<-> Node S4<-> Node S6<-> Node S5<-> Node S3<-> Node S2<-> Node S1, the data will be repeatedly forwarded in this ring, forming a broadcast storm.

As can be seen from the above analysis, since the conventional configuration scheme of too many ring network control channels does not reflect the idea of sub-rings, this may cause the problem that the two loops intersecting form a data loop in the event of a failure of the shared link. Therefore, it is very meaningful to improve the network performance by proposing a control channel configuration method with too many ring networks that reflects the sub-ring idea. Summary of the invention

The technical problem to be solved by the present invention is to provide a control channel configuration with too many ring networks and a message transmission method thereof, which embody the idea of a sub-ring model, avoid data loop generation, and improve network performance.

In order to solve the above problem, a control channel configuration with too many ring networks and a message transmission method thereof are applied to an Ethernet ring network composed of tangent or intersecting rings and sub-rings, and the control channel of the configuration ring includes a ring. All the ports, the protocol packets of the control channel of the ring are only transmitted in the ring;

The control channel of the sub-ring is configured to include all the ports on the sub-ring and all the ports on the ring. The protocol packets of the control channel of the sub-ring are not only propagated in the sub-ring but also through the interconnecting nodes of the ring and the sub-ring. Spread up

Rings of the ring and subrings of the ring protection link control node are simultaneously released or connected to the ring protection link Blocks the forwarding of data packets and the forwarding of sub-ring control channel protocol packets.

Further, when the ring is not faulty, the ring-protected link control node of the ring is connected to the ring protection link to block the forwarding function of the data packet and the protocol packet forwarding function of the sub-ring control channel.

Further, when the ring non-ring protection link is faulty, the port blocking data packet forwarding function and the sub-ring control channel protocol packet forwarding function of the adjacent node of the fault link, the ring ring protection link control node The port connected to the ring protection link enables the forwarding of data packets and sub-ring control channel protocol packets.

Further, when the ring protection link of the ring is faulty, the port of the ring protection link control node that is connected to the ring protection link blocks the forwarding function of the data packet and the forwarding function of the sub-ring control channel protocol packet.

Further, when the non-ring protection link of the sub-ring fails, the forwarding function of the blocked data packet of the adjacent node of the faulty link and the forwarding function of the sub-ring control channel protocol packet, the ring protection link of the sub-ring The port connected to the ring protection link is enabled to forward data packets and sub-ring control channel protocol packets.

Further, when the ring receives the fault notification packet sent by the sub-ring, the ring does not process the fault notification packet.

Further, when the ring protection link of the sub-ring is faulty, the ring protection link control node of the sub-ring and the port connected to the ring protection link block the forwarding function of the data packet and the protocol packet forwarding function of the sub-ring control channel.

Further, when the sub-ring is loop-switched, the sub-ring sends a protocol with address refresh information to the ring through the sub-ring control channel, and the node on the ring receives the protocol with the address refresh information>3⁄4 , refresh the address forwarding table of the node according to the address refresh information.

Further, when the ring link between the ring and the sub-ring interconnect node fails, the interconnect node sends a fault notification message only to the control channel of the ring, and the ring performs path switching, so that the control channel of the sub-ring is unblocked.

Further, the specific process of the path switching by the ring is:

After receiving the fault notification packet, the ring protection link control node of the ring opens the data packet forwarding function of the port connected to the ring protection link and the protocol packet forwarding function of the sub-ring control channel. Compared with the conventional technology, the control channel with too many ring networks of the present invention can avoid the problem that the ring and the sub-ring form a broadcast loop, and improve network performance.

BRIEF abstract

Figure la is a top view of too many ring networks;

Figure 2a is a topology diagram of a communication path when the link in too many rings is intact;

Figure 2b is a topology diagram of a communication path when there is a link failure in too many ring networks;

Figure 3a is a schematic diagram of control VLANs of respective rings in a conventional scheme;

Figure 3b is a schematic diagram of data loop formation when a shared link fails;

4a is a specific flowchart of an embodiment of the present invention;

4b, 4c, 4d, 4e and 4f are schematic views of the first embodiment in various scenarios;

FIG. 5a is a schematic diagram of a practical application of applying the present invention to protect with too much ring network; FIG.

FIG. 5b is a schematic diagram of a practical application 2 for applying too much ring network protection by applying the present invention.

Preferred embodiment of the invention

In order to solve the disadvantages of the conventional technical solutions, the present invention further clarifies a control channel configuration with a too many ring networks and a transmission method thereof according to the following specific embodiments. The following describes the specific implementation manner in detail, but does not The invention is defined. Embodiment 1 The working process of the control channel with too many ring network sub-rings:

4a is a working flow chart of a control channel of a too many ring network sub-rings. The control channel of the sub-rings in the figure is implemented by a VLAN, but is not limited to being implemented by using a VLAN. The specific steps are as follows (the process of describing different situations is described) The steps are not in a fixed order):

Step 501: Configure a control VLAN of the ring and the sub-ring in the ring network to ensure that the control packet of the sub-ring passes through the ring, and the control packet of the ring cannot enter the sub-ring.

For example, in Figure 4b, the control channel of Ring Ring1 is VLAN 3. The control channel of the subring Ring2 is VLAN 4. The nodes included in VLAN 3 are SI node, S2 node, S3 node, S4 node, S5 node, and S6 node. The nodes included in VLAN 4 are S1 node, S2 node, S3 node, and S4. Node, S5 node, S6 node, S7 node, and S8 node. The SI node is the ring protection link control node of Ring1, and the link directly connected to the 12 port of the S1 node is the ring protection link of Ringl. The S7 node is the ring protection link control node of Ring2, and the link directly connected to port 72 of the S7 node is the ring protection link of Rin _g 2. The 12 ports of the S1 node (ring protection link control node) of Ringl implement synchronous release and blocking of the data VLAN and the control VLAN of Ring2. The specific steps are as follows:

Step 502: The transmission of the control message of the sub-ring in the ring is divided into three cases. The first case is that the link on the ring has a single point of failure, as shown in step 503; the second case is that the link on the ring and the sub-ring does not fail, as shown in step 506; the third case is a sub-ring. There is a single point of failure on the link, as shown in step 507;

Step 503: When a single point of failure occurs on the link of the ring, the two cases are processed. In one case, the link is a non-ring protection link on the ring, as shown in step 504. In another case, the link is a ring protection link on the ring, as shown in step 505.

Step 504: When the ring protection link on the ring is faulty, the ring protection link control node on the ring opens the packet forwarding function of the protection data VLAN of the slave port and the control VLAN of the sub-ring. As shown in Figure 4c, the ring The link <S5, S4> on the Ringl fails. The port 52 of the S5 node and the port 42 of the S4 node both block the packet forwarding of the protected data VLAN and the sub-ring Ring2 control VLAN. The ring protection link control node on Ringl S1 opens the data VLAN of the slave port and the message forwarding function of the Ring2 control VLAN.

Step 505: When the ring protection link on the ring is faulty, the slave port of the ring protection link control node on the ring continues to block the packet forwarding function of the protection data VLAN and the sub-ring control VLAN; as shown in Figure 4d, when the ring When Ringl's ring protection link <S1, S2> fails, the 12 ports of the S1 node (ring protection link control node) and the 21 port of the S2 node both block the protection data VLAN and the sub-ring Ring2 control VLAN.

Step 506: When the links on the ring and the sub-ring are not faulty, the slave port of the ring protection link control node on the ring continues to block the forwarding function of the control VLAN of the protection data VLAN and the sub-ring; Step 507, when the sub-ring chain When the path is faulty, it is handled in two cases. In one case, the link is a non-ring protection link on the sub-ring, as shown in step 508. In the other case, the link is a ring protection on the sub-ring. Link, as shown in step 509; Step 508: When the non-ring protection link of the sub-ring fails, the ring protection link control node of the sub-ring opens the packet forwarding function of the protection data VLAN of the slave port and the control VLAN of the sub-ring, and the node on the ring receives the sub-interface. When the address sent by the ring refreshes the packet, the address forwarding table is refreshed.

Note: The fault notification packet sent by the sub-ring is transparently transmitted to the ring. However, the protocol packets (failure notification packets) of the ring-to-sub-ring are generally processed as data. The ring is equivalent to one channel of the sub-ring protocol packet. However, the address refresh packet sent by the sub-ring is processed.

As shown in FIG. 4e, the link <S2, S8> of the sub-ring Rin _g 2 fails, and the port 23 of the S2 node and the port 81 of the S8 node both block the packet forwarding of the protection data VLAN and the control VLAN of the Ring 2. The S7 node of Rin _g 2 (ring protection link control node) opens the data VLAN of the slave port and the forwarding function of the sub-ring control VLAN. When the ringl node receives the address refresh packet sent by Ring2, it will refresh the address forwarding table.

Step 509: When the ring protection link on the sub-ring fails, the slave port of the ring protection link control node on the sub-ring continues to block the packet forwarding function of the protection data VLAN and the sub-ring control VLAN.

As shown in FIG. 4f, when the ring protection link <S3, S7> of the sub-ring Rin _g 2 fails, the 72 port of the S7 node (ring protection link control node) and the 33 port of the S3 node both block the protection data. VLAN and Ring2 control packet forwarding of VLANs.

Practical application examples:

Practical application example 1

In a protection switching with too many ring network protection protocols, the control channel of the sub-ring of the present invention is applied to avoid the problem that the links of the ring and the sub-ring jointly form a loop.

As shown in Figure 5a, the S1 node is the ring protection link control node of ring Ring1, and the link connected to port 12 of S1 node is the ring protection link of Ringl. The S7 node is the ring protection link control node of the sub-ring Rin _g 2, and the link connected to the 72 port of the S7 node is the ring protection link of the Ring 2. VLAN 4 is the control channel of Ring2, and the control packet of Ring2 is transmitted in VLAN 4. VLAN 3 is the control channel of Ringl, and the control packet of Ringl is transmitted in VLAN 3. When the shared link between the node S3 and the node S2 fails, the node S3 and the node S2 respectively block the data forwarding function of the data VLAN of the port 31 and the port 22 and the control VLAN of the ring 2, and A failure notification frame is sent from the 32 port of the node S3 and the 21 port of the node S2 on the control VLAN of the Ring1, and the failure notification frame is not sent on the control VLAN of the Ring2. After receiving the fault notification frame, the S1 node (ring protection link control node) of Ringl opens the data forwarding function of the 12-port slave port and the Ring2 control VLAN. The path of Ring2's control message traversing Ring1 is: Node S2<-> Node S3 is switched to path: Node S2<-> Node Sl<_> Node S6<_> Node S5<_> Node S4<_> Node S3. The link health protocol frame sent by the S7 node (ring protection link control node) of Ring2 on its control VLAN can reach the other ring port of the S7 node through the new path on Ring1. After receiving the link health protocol frame sent by the S7 node, the S7 node considers that Rin _g 2 has not failed, and does not open the data packet forwarding function of the 72 slave port. Therefore, the control channel of the sub-ring configured by the present invention can avoid the loop problem caused by the failure of the shared link.

Practical application example 2

When a protection ringover occurs in a sub-ring with too many ring networks due to a link failure, the control channel of the sub-ring of the present invention can be used to transmit the node refresh address forwarding table of the protocol packet notification ring.

As shown in Figure 5b, the control channel of the sub-ring Rin _g 2 is implemented by the control VLAN of Rin _g 2, which contains all the ports on the ring. When the link <S2, S8> of Rin _g 2 fails, the port 23 of the S2 node and the port 81 of the S8 node block the forwarding of the data. At the same time, the S8 node sends a fault along the control port of Ring 2 along port 82. The notification frame. After receiving the protocol frame, the S7 (ring protection link control node) of Ring2 refreshes the address forwarding table, turns on the data forwarding function of the slave port 72, and periodically transmits the address refresh frame on the control VLAN of Ring2. After receiving the address refresh frame, the other nodes of Ring2 refresh the address forwarding table. After receiving the protocol frame on the control VLAN of Rin _g 2, the node of Ringl also refreshes the address forwarding table.

In summary, the present invention proposes a new method for controlling a channel with too many ring sub-rings. The core idea is that the control channel packets of the ring can only be propagated in the ring, and the packets of the sub-ring control channel are not only Can be transmitted in the ring and can pass through the ring. The method avoids the problem that the ring and the sub-ring form a broadcast loop, and at the same time facilitates the address refresh of the ring node caused by the sub-ring link switching. The method of the invention can It is used in a variety of protection technologies with too many ring networks. It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

Claims

Claim

1. A control channel configuration with too many ring networks and a message transmission method thereof, applied to an Ethernet ring network consisting of tangent or intersecting rings and sub-rings, characterized in that

The control channel of the ring is configured to include all the ports on the ring, and the protocol packets of the control channel of the ring are only transmitted in the ring;

The control channel of the sub-ring is configured to include all the ports on the sub-ring and all the ports on the ring, and the protocol packet of the control channel of the sub-ring not only propagates in the sub-ring but also passes through the An interconnecting node of the ring and the subring propagates on the ring;

The ring-protected link control node of the ring and the sub-ring of the link control node simultaneously releases or blocks the forwarding function of the data packet and the forwarding function of the sub-ring control channel protocol packet.

2. The method of claim 1 wherein:

When the ring is not faulty, the ring protection link control node of the ring is connected to the ring protection link to block the forwarding function of the data packet and the protocol packet forwarding function of the sub-ring control channel.

3. The method of claim 2, wherein

When the ring protection link of the ring is faulty, the port blocking function of the neighboring node of the faulty link blocks the forwarding function of the data packet and the forwarding function of the sub-ring control channel protocol packet, and the ring ring protection link control node The port connected to the ring protection link enables the forwarding of data packets and sub-ring control channel protocol packets.

4. The method of claim 3, wherein

When the ring protection link of the ring is faulty, the port connected to the ring protection link of the ring protection link of the ring block the forwarding function of the data packet and the forwarding function of the sub-ring control channel protocol packet.

5. The method of claim 1 or 2 or 3 or 4, wherein

When the non-ring protection link of the sub-ring fails, the forwarding function of the blocked data packet of the adjacent node of the faulty link and the forwarding function of the sub-ring control channel protocol packet, the ring protection chain of the sub-ring The port connected to the ring protection link opens the function of forwarding data packets and sub-ring control channel protocol packets.

6. The method of claim 5, wherein

When the ring receives the fault notification >3⁄4 text sent by the sub-ring, the ring does not process the fault notification.

7. The method of claim 5, wherein

When the ring protection link of the sub-ring is faulty, the ring protection link control node of the sub-ring and the ring-protection link are blocked by the data packet forwarding function and the protocol packet forwarding function of the sub-ring control channel. .

8. The method of claim 5, wherein

When the sub-ring is loop-switched, the sub-ring sends a protocol packet with address refresh information to the ring through the sub-ring control channel, and the node on the ring receives the protocol with address refresh information. After the packet is received, the address forwarding table of the local node is refreshed according to the address refresh information.

9. The method of claim 1 or 2 or 3 or 4, wherein

When the ring link between the ring and the interconnecting node of the sub-ring fails, the interconnecting node sends a fault notification message only to the control channel of the ring, and the ring performs path switching, so that the sub-ring The control channel of the ring is unblocked.

10. The method according to claim 9, wherein the specific process of the path switching by the ring is:

After receiving the fault notification message, the ring protection link control node of the ring opens the data packet forwarding function of the port connected to the ring protection link and the protocol packet forwarding function of the sub-ring control channel.