WO2011026319A1

WO2011026319A1 - Ring network protection method based on local fault detection and system thereof

Info

Publication number: WO2011026319A1
Application number: PCT/CN2010/070773
Authority: WO
Inventors: 刘国满
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-09-04
Filing date: 2010-02-26
Publication date: 2011-03-10
Also published as: CN102014011A

Abstract

In order to implement protection relatively simply, recover and protect services rapidly, and implement the recovery and protection of peer-to-peer (P2P) and point-to-multipoint (P2MP) services on a ring network, a ring network protection method based on local fault detection is provided, which includes the following steps: when having detected a local fault, a node generates a fault message and sends the fault message to the other nodes on the ring network; a source node sends services via a working path and a protection path which are in opposite directions; and a destination node receives services via the working path or the protection path. Furthermore, a ring network protection system based on local fault detection is also provided.

Description

TECHNICAL FIELD The present invention relates to the field of ring network protection, and more particularly to a ring network protection method and system based on local fault detection. BACKGROUND When a link between a node on a ring network and/or a neighboring node fails, part of the traffic transmitted on the ring network may not reach the destination node, resulting in packet loss. To solve this problem, the related art provides a method for protecting the service on the ring network, that is, the Steering protection method on the G.8132 T-MPLS ring network protection standard, and the method mainly includes the following steps:

1. First, establish a working path and a protection path with opposite directions for each service on the ring network. Under normal circumstances, the transmitting end node of each service only sends traffic from the working path, and the service receiving node also chooses to receive services from the working path direction;

2. When the local link or the state of the node is detected by the local fault packet, a faulty packet is generated by the node that detects the fault and sent to other nodes on the ring network.

3. After receiving the fault packet, the ring network node determines whether the service sent by the node is affected by the fault. If yes, the node switches the service to the protection path for transmission. Otherwise, it still sends the service path. The business;

4. In the case where the result of the determination in step 3 is YES, the receiving node of each service receives the service correspondingly on the protection path; in the case where the result of the determination in step 3 is no, the receiving node of each service is correspondingly Receive business on the work path. The method has the following advantages: the protection path is relatively short, and the overhead and delay are small. However, the following disadvantages exist: After receiving the fault packet, the node needs to judge the impact of the fault on the service transmission, and increases the processing time of the node. In the process of determining that there is a service affected by the fault in the service to be sent, all the services to be sent are switched to the protection path, so that the service transmission that is not affected by the failure fails (because the receiving node is always at this time) The path is received on the protection path. Therefore, this method is not applicable to P2MP services. SUMMARY OF THE INVENTION In order to reduce the processing time of a node on the one hand and the protection and recovery of P2P and P2MP services on a ring network on the other hand, the present invention proposes a ring network protection method based on local fault detection, which includes the following steps: When a local fault occurs, a fault packet is generated, and the fault packet is sent to other nodes on the ring network. After receiving the fault packet, the source node sends the service through the working path and the protection path, where the working path and the protection path are The forwarding direction is reversed along the ring; the sink node receives the service via the working path or the protection path. Before the step of generating a fault packet and sending the fault packet to other nodes on the ring network, the method further includes: configuring a working path and a protection path for each service on the ring network; Local neighbors on the ring network perform local fault detection. After the step of receiving, by the sink node, one of the working path and the protection path, the method further includes: when the received direction changes, the sink node feeds back the received path information message to the source node. When the receiving path information packet sent by all the sink nodes indicates that the service is received from the working path, the source node only selects the working path to send the service; when all the receiving path information packets sent by the sink node indicate that the service is received from the protection path The source node only selects the protection path to send the service. The source node selects the working path and the protection path to send the service when the receiving path information message sent by the sink node indicates that the service is received on the working path and the service is received on the protection path. After receiving the fault packet, the source node determines whether the fault indicated by the fault packet affects the transmission of the service. If the judgment result is yes, the source node sends the service through the working path and the protection path. Wherein, if the determination result is no, the source node sends the service via the working path. When the node on the ring network receives the information that the fault disappears, the source node selects the working path to transmit, and the sink node selects the working path to receive. The fault packet and the receiving path information packet are sent through the control channel or the data channel. The service is at least one of a P2P service or a P2MP service. In addition, the present invention also proposes a ring network protection system based on local fault detection, including a ring. The network, the multiple nodes on the ring network, and the link between each two nodes further include: a fault packet generation module, which is set in each node of the ring network, and is used to generate a fault when detecting a local failure. The fault message is sent to the node other than the node where the current fault packet generation module is located on the ring network; the two-way sending module is configured to enable the source node to send the service via the working path and the protection path, where The working path and the protection path are opposite to each other in a ring forwarding direction; and a one-way receiving module is configured to enable the sink node to receive the service via the working path or the protection path. The service is at least one of a P2P service or a P2MP service. Compared with the existing ring network protection method, the processing time of the node is shorter, the protection implementation is relatively simple, and the P2P and P2MP services on the ring network can be protected and restored. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, illustrate, In the drawings: FIG. 1 is a schematic diagram of service forwarding in a normal state; FIG. 2 is a schematic diagram of dual service transmission in a fault state; FIG. 3 is a schematic diagram of service selective dual-issue in a fault state; FIG. 4 is a data loop based on local fault detection. Schematic diagram of the network service protection process. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The ring network protection method based on the local fault detection of the present invention mainly includes the following steps: Step 1: When a node detects a local fault, generates a fault packet, and sends the fault message to the ring network to generate the fault. 4 other nodes than the node of the text; Step 2, after receiving the fault message, the source node sends the industry via the working path and the protection path The working path and the protection path are opposite to each other in the direction of the ring forwarding. Step 3: The sink node receives the service via the working path or the protection path. Through this method, on one hand, the process of judging the impact of the fault on the service is avoided, thereby reducing the processing time of the node and realizing rapid protection; on the other hand, the use of the dual-issue mechanism increases the support for P2MP service protection. . Specifically, the locally occurring failure in step 1 may be a failure of a local link or node. Preferably, after step 3, the method further includes: Step 4: When the direction received by the sink node changes, the sink node feeds back the path information packet to the source node. Specifically, when the receiving path information packet sent by all the sink nodes indicates that the service is received from the working path, the source node only selects the working path to send the service; when the receiving path information packet sent by all the neighboring nodes indicates that the service is received from the protection path When the source node selects only the protection path to send the service. When the receiving path information message sent by the sink node indicates that the service is received on the working path and the service is received on the protection path, the source node selects the working path and the protection path to send the service. Preferably, when the node on the ring network receives the information that the failure disappears, the source node selects the working path to transmit, and the sink node selects the working path to receive. In the above manner, it is ensured that when the working path returns to normal, the original single-issue mode is returned, thereby keeping the bandwidth overhead within a small range. Preferably, in step 2, after receiving the fault message, the source node determines whether the fault indicated by the fault message affects the transmission of the service. If the determination result is yes, the source node sends the service via the working path and the protection path. If the judgment result is no, the source node transmits the service via the working path. With this method, in the case that the service transmission is not affected by the failure, the single-issue mode originally transmitted on the working path is maintained, and the system bandwidth consumption caused by the dual-issue can be reduced. FIG. 4 is a schematic diagram of a data ring network service protection process based on local fault detection. As shown in FIG. 4, for the ring network structure shown in FIG. 1, the main process for implementing protection is as follows:

1. For the ring network, firstly, the opposite working path and protection path are established for each service on the ring network. And under normal circumstances, the sending end node of each service only sends traffic from the working path, and the service receiving node also selects to select the service from the working path direction, and passes local fault detection on each adjacent node on the ring network. Packets are constantly detected for link and node failures; 2. When the local link or node status is detected by the local fault packet, as shown in Figure 2, a faulty node is generated, and a fault message is generated and sent to the control channel or data channel. Other nodes on the ring network;

3. After receiving the faulty packet, each node on the ring network performs packet analysis. If the node has a service to be sent on the ring, the service is first sent from the working path and the protection path. For each receiving node on the ring, one of the paths is selected to receive the service. Specifically, before the dual transmission, the packet may be determined to be a fault switching request. If yes, the service is from the working path and the protection path. On the dual-issue, each receiving node on the ring selects one of the paths to receive the service. Otherwise, the working path is selected to send the service, and each receiving node on the ring selects the working path to receive the service;

4. The receiving node of each service detects a change in the receiving path, generates a receiving path information message, feeds back the receiving state change, and sends it to the sending node of the service; and the sending node selects a path according to the receiving status of each receiving node. Send or keep two paths sent at the same time, as shown in Figure 3;

5. When the fault on the ring network disappears or returns to the normal state, when the nodes on the ring receive the information that the fault disappears, the sending nodes on the ring re-select only the original working path to send the service; and the receiving node of the service re-selects. The service is received from the working path direction; and the fault message and the receive path state change message (ie, the above-mentioned receive path information message) indicating the link fault are sent by the control channel or the data channel. The following is a description of the two state diagrams shown in FIG. 1 and FIG. 2 as an example to describe the specific implementation process of the data ring network protection. Example 1

1. Under normal circumstances, as shown in Figure 1, there are two services on the ring: one is P2P service from 102 nodes to 108 nodes; the other is P2MP from 103 nodes to 105 and 107 nodes. business. If the service path direction configured by these services is transmitted in a clockwise direction, then for the service sending nodes 102 and 103, each node selects the right port in the working path direction to send the service, and each adjacent node on the ring Continuous detection of local link failures or node failures through local link packets; 2. When a fault or an abnormality is detected through the local fault detection message, as shown in FIG. 2, when the link between the 105 and 106 nodes fails, the faulty or abnormal node 105 or 106 is detected locally, Generating a fault switching request message, which is sent to other nodes on the ring through the control channel or the data channel;

3. After the other nodes on the ring receive the fault request sent by the 105 or 106 nodes from the control channel or the data channel, they send the service on the ring from the working path and the protection path. Send it. For example: P2P services from 102 nodes to 108 nodes are respectively

102-101-108 and 102-103-104-105-106-107-108 transmit on two paths; and for the receiving node 108, select one path for reception, as shown in Figure 2 , then choose to receive traffic from the direction of 102-101-108; and for the P2MP service from 103 nodes to 105 and 107 nodes, separate 'J from 103-104-105-106-107 and

103-102-101-108-107-106-105 send the traffic in two path directions, and select a path direction for receiving nodes 105 and 107 to receive the service;

4. The receiving node of each service, such as: the receiving node 108 of the P2P service initiated by the 102 node, the receiving node 105 and 107 of the P2MP service initiated by the node 103; since the transmission and reception paths of the 108 and 107 nodes change, it is necessary to The transmitting end nodes 102 and 103 of the service send the receiving path information, and the service sending node determines whether to select one path to send or two according to whether all receiving nodes are in the same path (all nodes are received from the working path or from the protection path). The path (working path and protection path) simultaneously sends service packets;

5. When the fault on the ring network disappears, the 105 or 106 node detects the fault ^! If the large-scale change occurs, a switch-recovery request message is regenerated, and then sent to other nodes on the ring through the control channel or data channel. When the other nodes on the ring receive the packet for the switchover recovery request, the original message will be The service sent from the two path directions or sent only on the protection path is re-selected to be sent from one direction of the working path; for example, the P2P service from 102 nodes to 108 nodes is reselected from 102-103-104-105- 106-107-108 path to send traffic; and for the receiving node 108, re-select the working path direction receiving service; and for the P2MP service sent by the 103 node to the 105 and 107 nodes, the two directions are also stopped. For the transmission of the service, only the service is sent in the direction of the working path of 103-104-105-106-107, and the receiving nodes 105 and 107 are restored to the original working path direction to receive the service; status. Example 2

1. Under normal circumstances, as shown in Figure 1, there are two services on the ring: P2P services from 102 nodes to 108 nodes; the other is P2MP services from 103 nodes to 105 and 107 nodes. If the service path direction configured by these services is transmitted in a clockwise direction, then for the service sending nodes 102 and 103, each node selects the right port in the working path direction to send the service, and each adjacent node on the ring Continuous detection of local link failures or node failures through local link packets;

2. When a fault or an abnormality is detected through the local fault detection message, as shown in FIG. 2, when the link between the 105 and 106 nodes fails, the faulty or abnormal node 105 or 106 is detected locally, Generating a fault switching request message, which is sent to other nodes on the ring through the control channel or the data channel;

3. After receiving the fault request message sent by the 105 or 106 node from the control channel or the data channel, the other nodes on the ring determine whether the current service transmission is affected by the fault. If the judgment result is yes, then The service sent by the ring itself is sent from the working path and the protection path. If the result of the determination is no, the service is kept on the working path. For the P2P service of the 102-node to the 108-node in this example, since the working path 102-103-104-105-106-107-108 passes the link where the roadblock occurs, the service is affected by the fault, respectively The transmission is performed on two paths from 102-101-108 and 102-103-104-105-106-107-108; and for the receiving node 108, one path is selected for reception, as shown in Figure 2 In the case, the service is selected from the direction of 102-101-108; for the P2MP service of the 103-node to the 105-node in this example, since the working path 103-104-105 does not pass the failed link, it does not constitute The impact on the traffic transmission, thus keeping the traffic on the working path 103-104-105, the receiving node 105 receiving the service from the working path; for the P2MP service of the 103 node to the 107 node in this example, due to The working path 103-104-105-106-107 passes through the failed link, which has an impact on the transmission of the service. Therefore, it is from 103-104-105-106-107 and 103-102-101-108-107-106 respectively. -105 two path directions to send the industry And for selecting a receiving node 107 receives traffic path direction;

4. The receiving node of each service, such as: the receiving node 108 of the P2P service initiated by the 102 node, the receiving node 105 and 107 of the P2MP service initiated by the node 103; since the transmission and reception paths of the 108 and 107 nodes change, it is necessary to The transmitting end nodes 102 and 103 of the service send the receiving path information, and the service sending node determines whether to select one path to send or two according to whether all receiving nodes are in the same path (all nodes are received from the working path or from the protection path). The path (working path and protection path) simultaneously sends service packets; 5. When the fault on the ring network disappears, that is, if the 105 or 106 node detects that the fault has changed, the switch generates a switchover request message and sends it to the other nodes on the ring through the control channel or data channel. For the packets received by the other nodes on the ring to receive the switchover recovery request, the services that are sent from the two path directions or sent only on the protection path are reselected and sent from the working path in one direction; for example: The 102-to-108-node service re-selects the path from 102-103-104-105-106-107-108 to transmit the service; and for the receiving node 108, the working path direction re-selects the service; and for the 103 node In the case of the 节点2ΜΡ service sent to the 107 nodes, the transmission of the service in both directions is also stopped, and only the service is sent in the direction of the 103-104-105-106-107 working path, and the receiving node 107 is restored to the original Some working paths come in to receive the service; they return to the state shown in Figure 1. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A ring network protection method based on local fault detection, comprising the following steps: a node generates a fault message when a local fault is detected, and sends the fault message to the ring network. Other nodes;

After receiving the fault, the source node sends the service via the working path and the protection path, where the working path is opposite to the protection path;

The sink node receives the service via the working path or the protection path.

The method according to claim 1, wherein a node generates a fault message when detecting a local fault, and sends the fault message to other nodes on the ring network, and further includes:

Configuring the working path and the protection path for each service on the ring network; each adjacent node on the ring network performs local fault detection.

The method according to claim 1, wherein after the step of receiving, by the sink node, the one of the working path and the protection path, the method further comprises: a direction received by the sink node When the change occurs, the sink node feeds back the received path information message to the source node.

The method according to claim 3, wherein when the receiving path information message sent by all the sink nodes indicates that the service is received from the working path, the source node only selects the working path to send. When the receiving path information packet sent by all the sink nodes indicates that the service is received from the protection path, the source node only selects the protection path to send the service.

The method according to claim 3, wherein when the receiving path information sent by the sink node indicates that both the working path is received and the service is received by the protection path And the source node selects the working path and the protection path to send a service.

The method according to any one of claims 1 to 5, wherein the method further comprises: After receiving the fault message, the source node determines whether the fault indicated by the fault message affects the transmission of the service, and if the determination result is yes, the source node sends the path through the working path and the protection path. Send the service.

7. The method of claim 6, wherein if the determination result is no, the source node transmits the service via the working path.

The method according to any one of claims 1 to 5, wherein when the node on the ring network receives the information that the failure disappears, the source node selects the working path to transmit, and the method The sink node selects the working path for reception.

The method according to any one of claims 3 to 5, wherein the fault message and the receive path information message are both sent via a control channel or a data channel.

The method according to any one of claims 1 to 5, wherein the service is at least one of a P2P service or a P2MP service.

A ring network protection system based on local fault detection, comprising a ring network, a plurality of nodes on the ring network, and a link between each two nodes, wherein the method further includes:

A fault message generating module is disposed in each node of the ring network, and is configured to generate a fault message when a local fault is detected, and send the fault message to the ring network. Other nodes other than the node where the current fault packet generation module is located;

a bidirectional transmitting module, configured to enable a source node to send a service via a working path and a protection path, where the working path is opposite to the protection path in a ring forwarding direction;

And a one-way receiving module, configured to enable the sink node to receive the service via the working path or the protection path.

The system according to claim 11, wherein the service is at least one of a P2P service or a P2MP service.