JP6408615B2 - Double connection ring network protection method and apparatus - Google Patents

Description

  TECHNICAL FIELD The present invention relates to the technical field of dual connection ring network protection, and more particularly to a method and apparatus for protecting a double connection ring network.

  In packet transport network (PTN) / router equipment, MPLS-TP (MPLS Transport Profile, Transport Multi-Protocol Label Exchange) protection mainly includes linear protection and ring network protection. The advantage of ring network protection technology is section layer protection, which can save a large number of Label Switched Path (LSP) entries and the amount of placement work. In general, there are different ring network protections for service access, aggregation and core assignment, and these rings have connection status. In such a double-connected ring network, the two sharing networks can connect to the dual nodes and connect to the Internet, and adopt a protection mechanism in a single ring against a single ring failure, If a failure exists, for example, if a failure occurs in any of two physical rings in a ring network where the connection point is, traffic is interrupted. To solve this problem, the conventional means adopts the method of superposition linear protection, as shown in FIG. 1, as shown in FIG. 1, two nodes C and D, each consisting of an ABDC node and a CDFE node, respectively. A typical double-connected ring network structure, including ring networks to be connected, indicated by the dotted line is a protection tunnel for tunnel linear protection. As can be seen from FIG. 1, a typical superposition linear protection method is adopted, the means has the following problems, the protection arrangement is complicated, a large amount of linear LSP protection needs to be arranged, and A lot of LSP OAM (Operation Administration and Maintenance) needs to be appointed, a lot of OAM needs to occupy a lot of bandwidth and software and hardware resources, and after performing overlay linear protection, Since protection needs to be protected by a ring network, bandwidth utilization is reduced, and in the case of ring network superposition linear, it is generally necessary to arrange a linear protection delay time, The switching time needs to be 100 to 150 ms.

  The main technical problem to be solved by the embodiments of the present invention is to solve the problem that the setting existing in the related superposition linear protection means is complicated, the resource utilization rate is low, and the conversion process takes a long time. It is to provide a method and apparatus for protecting a multi-connection ring network.

  In order to solve the above technical problem, the following technical means are adopted.

A dual connection ring network protection method, wherein the dual connection ring network includes an enter ring network and an out ring network connected by a master node and a backup node, and the method includes:
Establishing a switching tunnel in the entering network, the switching tunnel having a direction from the master node to the backup node, and at least some of the tunnels being directly connected to the master node and the backup node The main switching tunnel and a spare protection switching tunnel opposite to the direction of the main switching tunnel, and all nodes in the entering network are all in the spare protection switching tunnel;
When both of the two physical links of the master node in the outline network fail, the current service is switched to the switching tunnel and transmitted to the backup node, and the backup node enters the outline network. And the two physical links in the outline network of the master node are physical links in which the interconnection port and the non-interconnect port in the outline network of the master node are respectively located.

  Optionally, the spare protection switching tunnel is a closed loop tunnel.

Optionally, after the step of the current service entering the outlining network by the backup node, the method further comprises:
Switching the service preferentially to the working tunnel of the outbound network, and switching to the protection tunnel of the working tunnel when the working tunnel fails.

Optionally, switching the current service to the switching tunnel comprises:
Preferentially switching the current service to the main switching tunnel, and switching the service to the spare protection switching tunnel if the main switching tunnel fails.

Optionally, both of the two physical links in the outline network of the master node have a failure appearing:
Failure of only two physical links in the outlining network of the master node,
Or, two physical links in the outlining network of the master node include a failure, and at the same time, at least one physical link in the entering network includes a failure.

A dual connection ring network protection device, wherein the dual connection ring network includes an enter ring network and an out ring network connected by a master node and a backup node;
The dual connection ring network protection device includes a path setting module and a path switching module;
The routing module establishes a switching tunnel in the entering network, the switching tunnel having a direction from the master node to the backup node, and at least some of the tunnels are the master node and the backup node A main switching tunnel directly connected to the main switching tunnel, and a spare protection switching tunnel opposite to the direction of the main switching tunnel, and all nodes in the entering network are configured to be in the spare protection switching tunnel,
The path switching module switches the current service to the switching tunnel when a failure occurs in both of the two physical links of the master node in the outline network, and the service is transferred to the backup node by the switching tunnel. Set to communicate,
The two physical links of the master node in the outline network are physical links in which the interconnection port and the non-interconnection port of the master node in the outline network are respectively located.

  Optionally, the spare protection switching tunnel is a closed loop tunnel.

Optionally, the path switching module includes an operating path switching sub-module and a protection path switching sub-module,
The working path switching sub-module switches the current service to the working tunnel of the outlining network preferentially after the current service enters the outlining network by the backup node, and the working tunnel fails. , Configured to notify the protection path switching submodule,
The protection path switching submodule is configured to switch the current service to a protection tunnel of the working tunnel after receiving the notification.

Optionally, the path switching module includes a main path switching sub-module and a spare path switching sub-module,
The main path switching submodule preferentially switches the current service to the main switching tunnel when switching the current service to the switching tunnel, and if the main switching tunnel fails, the spare path switching submodule Is set to notify
The spare path switching submodule is configured to switch the current service to the spare protection switching tunnel after receiving the notification.

Optionally, both of the two physical links in the outlining network of the master node will fail.
Failure of only two physical links in the outlining network of the master node,
Or, two physical links in the outlining network of the master node include a failure, and at the same time, at least one physical link in the entering network includes a failure.

  The method and apparatus for protecting a dual connection ring network provided by an embodiment of the present invention firstly establishes a switching tunnel in the entering network, the switching tunnel being from the master node to the backup node, and Including a main switching tunnel where at least some of the tunnels are directly connected to the master node and the backup node, and a spare protection switching tunnel opposite to the direction of the main switching tunnel, and all nodes in the entering network are all spare protected When two physical links are in the switching tunnel and the master node's outlining network both fail, the current service is directly switched to the previously established switching tunnel. And is transmitted to the backup node through the switching tunnel, and further enters the outline network by the backup node. As can be seen, the embodiment of the present invention can easily and rapidly realize switching between ring networks by directly using a switching tunnel set for enter ring when switching between ring networks is required. Since there is no need to distribute a large amount of linear LSP protection, it is possible to reduce resources that need to be dedicated to distributing a large amount of linear LSPs, improve resource utilization, and at the same time simplify the configuration process. In addition, since it is not necessary to set the linear protection delay time, the conversion time can be further reduced, and the time required for the entire protection conversion of the means of the embodiment of the present invention by verification does not exceed 50 ms, And it corresponds to the route after conversion of the interactive service.

FIG. 1 is a schematic diagram that employs superposition linear protection for a dual connection ring network in the related art. FIG. 2 is a schematic diagram of a double connection ring network structure provided in the first embodiment of the present invention. FIG. 3 is a process schematic diagram of the dual connection ring network protection method provided in the first embodiment of the present invention. FIG. 4 is a schematic view of the structure of the double connection ring network protection device provided in Embodiment 2 of the present invention. FIG. 5 is a schematic diagram of a failure situation of two physical links in the outing network where the master node provided in the third embodiment of the present invention. FIG. 6 is a schematic diagram of failure status 2 of two physical links in the outing network where the master node provided in the third embodiment of the present invention. FIG. 7 is a schematic diagram of the failure situation 3 of two physical links in the outing network where the master node provided in Embodiment 3 of the present invention is provided. FIG. 8 is a schematic diagram of failure status 4 of two physical links in the outing network where the master node provided in the third embodiment of the present invention. FIG. 9 is a schematic diagram of a failure situation of two physical links in the entering network where the master node provided in the third embodiment of the present invention. FIG. 10 is a schematic diagram of failure status 2 of two physical links in the entering network where the master node provided in Embodiment 3 of the present invention. FIG. 11 is a schematic diagram of failure status 3 of two physical links in the entering network where the master node provided in Embodiment 3 of the present invention is provided.

Hereinafter, the present invention will be described in more detail with reference to the drawings by specific embodiments.
Example 1:

  In this embodiment, first, some concepts will be described with reference to FIG. In FIG. 2, a ring network 1 is constituted by the node ABCD, a ring network 2 is constituted by the node CDFE, the ring network 1 and the ring network 2 are Interneted by the node C and the node D, and the node C and the node D are inter-ring nodes. become. The node through which the service tunnel has passed is called a master node, the other nodes are called backup nodes, and service tunnel settings are backed up and stored in the backup node. When viewed from one direction of the service transmission direction with respect to the ring network 1 and the ring network 2, they are correspondingly called an enter network and an out network. For example, in FIG. 2, when establishing a two-way service tunnel from A node to E node and looking from the direction from A node to E node, at A node, the service tunnel enters the shared ring network and C network element Then, the service tunnel exits the shared ring network and enters the shared ring network on the right side, and the E node exits from the shared ring network and returns to obtain the service tunnel. Since the C node is the node through which the service tunnel has passed, it is called the master node, correspondingly the D node is the backup node, the ring network 1 is called the enter ring network, and the ring network 2 is called the out ring network . When the service is viewed from the direction from the E node to the A node, the ring network 2 is called an enter network and the ring network 1 is called an out network. The connection port between the master node and the backup node is called an interconnection port. Link detection devices can be set in the master node and the backup node, and the physical link states of the four ports (two interconnect ports and two non-interconnect ports) in the master node and the backup node, respectively, are detected. In FIG. 2, the two ports connected to master node C and backup node D are interconnect ports, the ports connected to node A and node E are non-interconnect ports, backup node D and master node, respectively. The two ports connected to C are interconnect ports, and the ports connected to node B and node F are non-interconnect ports, respectively. Master node C is the two physical links in the enter network, CA and CD in the enter network, and the two links in the out network are CE and CD in the out network These are two physical links.

  Still, each ring network has an operational tunnel and a corresponding protection tunnel. In a shared ring network, all the working tunnels are generally set as the longest path so that all nodes are in the working tunnel, and the corresponding protection tunnel is opposite the direction of the working tunnel and is closed loop . In Fig. 2, the working tunnel of ring network 1 is D-> B-> A-> C and the corresponding protection tunnel is D-> C-> A-> B-> D, and the working of ring network 2 The tunnel is F-> D-> C-> E and the corresponding protection tunnel is F-> E-> C-> D-> F.

  Based on the exemplary description of the above concept, the dual connection ring network protection method provided by the present embodiment will be described below with reference to FIG. 3, and as shown in FIG. including.

  Step 301, Establishing a switching tunnel in an enter ring network of a dual connection ring network.

  The switching tunnel established here has a direction from the master node to the backup node, and at least a part of the tunnel is directly connected to the master node and the backup node, and the direction of the main switching tunnel All nodes in the entering network are in the spare protection switching tunnel.

  Step 302, the master node determines whether both of the two physical links in the outing network will fail, and if so, moves to step 303, otherwise returns and continues to determine .

  Step 303, switch the current service to a previously established switching tunnel and communicate to the backup node via the switching tunnel.

  Step 304, the service enters the outline network by the backup node.

  As can be seen, by means such as shown in Fig. 3, when both of the two physical link directions in one ring of the master node fail, service is restored by the inter-ring node protection mechanism. Realize that the service between the rings of the master node goes to another backup node and spans the ring, and the time required for overall protection conversion does not exceed 50 ms, and at the same time, the path after bidirectional service conversion is Match.

  In this embodiment, when setting the main switching tunnel, theoretically, any other node than the backup node in the entering network is set as the start node, the backup node is set as the end node, and at least a part of the main switching tunnel is set. There is a direct tunnel from the master node to the backup node, and you only need to connect the two directly. Correspondingly, when setting the corresponding spare protection switching tunnel of the main switching tunnel, all the nodes in the entering network need only be in the spare protection switching tunnel. The spare protection switching tunnel may be set up as a closed loop tunnel or may be set up as a non-closed loop tunnel according to actual needs. Hereinafter, an exemplary description of the switching tunnel setting process will be given with reference to the dual connection ring network shown in FIG.

  In FIG. 2, the ring network 1 will be described as an entering network and the ring network 2 will be described as an outlining network. The method for establishing a switching tunnel in the entering network may include any one of the following methods.

  Method 1: The main switching tunnel is set as C-> D, and the corresponding spare protection switching tunnel is C-> A-> B-> D-> C.

  Method 2: The main switching tunnel is set as A-> C-> D, and the corresponding spare protection switching tunnel is A-> B-> D-> C-> A.

  Method 3: The main switching tunnel is set as B-> A-> C-> D, and the corresponding spare protection switching tunnel is B-> D-> C-> A-> B.

  In the shared ring network, the set route is preferably the longest. For this reason, the third type is preferable to the above-described several setting methods. It should be understood that the specific configuration scheme is not limited to the above-described several exemplary schemes according to the specific compositional structure variation of the shared ring network, for example, the increase or decrease of the nodes. More suitable transformations can be made according to the structure and application scenario.

  In the present embodiment, the service further includes the following processes after entering the outline network by the backup node.

  In the outbound network, the service is switched to the working tunnel of the outlining network with priority, and when the working tunnel fails, the service is switched to the protection tunnel of the working tunnel. The working tunnel failure here can specifically refer to the occurrence of a failure in the path from the node where the service is currently located to the out node (ie that node leaving the service sharing ring network). Of course, when a failure also occurs in the path that switches to the protection tunnel and reaches the out-node part of the protection tunnel, it further switches to the working tunnel, thus the service reaches the out-node and exits the shared ring network (ie out-ring). Switch repeatedly until leaving the network.

In this embodiment, when a failure occurs in both of the two physical links in the outlining network, the process of switching the current service to the switching tunnel in the entering network is as follows:
The service is preferentially switched to the main switching tunnel, and when the main switching tunnel fails, the service is switched to the corresponding spare protection switching tunnel. Here, the main switching tunnel failure specifically means that a failure occurs in the path from the current node of the service to the spare node in the main switching tunnel.

In this embodiment, when a failure occurs in both physical links of the master node in the entering network, the service is directly transferred to the backup node through the working tunnel and the protection tunnel in the entering network, and the master node enters the enter. The failure of both physical links in a ring network
That only two physical links in the master node's Entering Network will fail,
Or, the master node may include two physical links in the entering network failing and at least one physical link in the outing network simultaneously failing.

The failure of both physical links in the outlining network when the master node is
Failure of only two physical links in the master node's outing network,
Or, two physical links in the master node's out network include a failure and at the same time at least one physical link in the enter network includes a failure.
Example 2

This embodiment provides a dual connection ring network protection device, and includes a path setting module 41 and a path switching module 42, as shown in FIG.
The routing module 41 establishes a switching tunnel in the entering network, the switching tunnel is from the master node to the backup node, and at least some of the tunnels are directly connected to the master node and the backup node. Main switching tunnel, and a spare protection switching tunnel opposite to the direction of the main switching tunnel, and all nodes in the entering network are configured to be in the spare protection switching tunnel,
The path switching module 42 is configured to switch the current service to the switching tunnel and to transfer the service to the backup node through the switching tunnel when both physical links in the master node's outline network fail Is done. Services further enter the outing network with the backup node.

  In this embodiment, the spare protection switching tunnel set by the path setting module 41 is a closed loop tunnel. Of course, it may be a non-closed loop tunnel depending on the actual situation. It can be used for the shared ring network at the time of concrete setting, and is preferably set according to the principle that the set route is the longest.

  In this embodiment, the path switching module 42 includes an operating path switching sub-module 421 and a protection path switching sub-module 422, and the operating path switching sub-module 421 takes out the service after the service enters the out-ring network by the backup node. It is set to switch to the working tunnel of the ring network with priority and notify the protection path switching submodule 422 when the working tunnel fails. The protection path switching submodule 422 is configured to switch the service to the protection tunnel of the working tunnel after receiving the notification.

In this embodiment, the path switching module 42 further includes a main path switching submodule 423 and a spare path switching submodule 424.
When switching a service to a switching tunnel in the entering network, the main path switching submodule 423 gives priority to switching the service to the main switching tunnel and notifies the spare path switching submodule 424 when the main switching tunnel fails. Set to The spare path switching submodule 424 is configured to switch the service to the spare protection switching tunnel after receiving the notification.

In this embodiment, when a failure occurs in both physical links of the master node in the entering network, the service is directly transferred to the backup node through the working tunnel and the protection tunnel in the entering network, and the master node enters the enter. The failure of both physical links in a ring network
That only two physical links in the master node's Entering Network will fail,
Or, two physical links in the master node's enter network include a failure and at the same time at least one physical link in the out network includes a failure.

The failure of both physical links in the outlining network when the master node is
Two physical links in the outlining network with the master node appearing to fail,
Alternatively, the master node includes the occurrence of a failure in two physical links in the outing network and the occurrence of a failure in at least one physical link in the entering network at the same time.
Example 3:

  In order to better understand the present invention, exemplary descriptions of several types of failure situations of the master node will be given below with reference to the drawings.

  Further, the double connection ring network shown in FIG. 2 will be described as an example. Establishing a bidirectional service tunnel from node A to node E and looking from the direction from node A to node E, the service tunnel enters the shared ring network at node A, and the service tunnel at node C is the left shared ring network Exit the shared ring network on the right side, exit the shared ring network at E node, and return to get the service tunnel. Since the C node is a network element through which the service tunnel has passed, it is called a master node. Ring network 1 is called the enter ring network, and ring network 2 is called the out ring network. When viewed from the direction from the E node to the A node, the ring network 2 is called an enter ring network, and the ring network 1 is called an out ring network. The following description of the present embodiment will be described by taking as an example all viewing from the direction from A to E, and processing that is symmetric when viewed from the direction from the E node to the A node will not be repeated here.

  Since node C is the master node, it is necessary to copy and configure the service tunnel configuration at node C to backup node D, and the out interface is still an operational tunnel in the outbound F-> D-> C-> E. Yes, the enter interface may be a port between D and B, or one port may be set arbitrarily. Set the main switching tunnel as B-> A-> C-> D and the corresponding spare protection switching tunnel as B-> D-> C-> A-> B in the enter network (ie ring network 1) Set. The working tunnel of the entering network is D-> B-> A-> C, the corresponding protection tunnel is D-> C-> A-> B-> D, and the out-ring network (ie ring network 2) The working tunnel is F-> D-> C-> E and the corresponding protection tunnel is F-> E-> C-> D-> F.

  When a single point of failure appears in the Entering Network or Outing Network, or when a single point of failure appears in the Entering Network and Outing Network at the same time, a single ring protection transformation (ie, Entering) Can be solved by the conversion of the working tunnel of the network and the out-ring network and the corresponding protection tunnel), and there is no inter-ring conversion operation. For example, the link between the node A and the node C in the entering network may be broken, and a simple single ring conversion operation may be performed. The two physical links with the master node in the entering network are both involved in the inter-ring conversion operation only when a failure appears. Hereinafter, specific examples of several types of failure of the master node will be described.

  In addition to the above settings, as shown in FIG. 5, the master node C only has two physical links (ie C-> E link and C-> D link) in the outbound network. The conversion process at this time is as follows.

  The service reaches the master node C through the working tunnel of the entering network, and an inter-ring conversion operation appears on the master node C, and the service leaves the working tunnel of the entering network at the master node C and is directly switched to the main Entering the tunnel, the service is now at node C of the main switching tunnel, and there is no failure in the path from node C to node D, so the service directly goes from node C to node D (which is the backup node And end at node D. Leaving node D to get service, the service enters the outlining network at backup node D. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. Since the path from node D to node C fails, the service cannot be transmitted directly to the out-node E via the working tunnel, so the corresponding protection tunnel F-> E-> C-> D-> F Switching to A failure occurs in the path from node E to node C, and the service needs to be out of the ring at node E (ie, leaving the shared ring network), so node E can perform a single ring conversion operation. After doing and switching to the working tunnel and switching to the working tunnel, the service is now at node E, so it goes out of the ring directly to node E. The path related to the switching process refers to the portion indicated by the dotted line in FIG.

  As shown in Fig. 6, the figure shows that master node C has two physical links in the outbound network (ie C-> E link and C-> D link) that have failed and are entertained at the same time One link (C-> A link) in the network is the occurrence of a failure, and the conversion process at this time is as follows.

  When the service is transmitted to the entering network through the working tunnel, it is discovered that a failure occurs in the path between node A and node C in the working tunnel, and switches to the protective tunnel of the working tunnel. To reach the C network element via B, D, switch the C network element to the working tunnel, and exit the shared ring network and prepare to enter the out ring, It is discovered that all faults appear, and an inter-ring conversion operation appears on the master node C, the service leaves the working tunnel of the entering network at the master node C, directly enters the main switching tunnel, and the service is now the main switching tunnel To node C And there is no failure in the path from node C to node D, so the service can be transferred directly from node C to node D (which is a backup node) and terminates at node D To do. Leaving node D to get service, the service enters the outlining network at backup node D. The next operation and the subsequent processing in FIG. 5 are the same.

  As shown in Fig. 7, the figure shows that master node C has two physical links in the outbound network (ie C-> E link and C-> D link) that have failed and are entered at the same time The other link (C-> D link) in the network is the appearance of a failure, and the conversion process at this time is as follows.

  Since the service reaches Master Node C via the Entering Network's working tunnel and the Outing Network's working and protection links are all broken, Inter-Ring Conversion Operation appears on Master Node C, and Service goes to Master Node C. Because it exits the working tunnel of the entering network and directly enters the main switching tunnel, the service is currently at node C of the main switching tunnel and a failure occurs in the path from node C to node D Switch to a new spare protection switching tunnel, transfer to node D via nodes C, A, and B in the spare protection switching tunnel, leave node D to obtain service, and service is the backup node D in the outing network to go into. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. Since a failure occurs in the path from node D to node C, and the service cannot be transmitted directly to the out-node E via the working tunnel, the corresponding protection tunnel F-> E-> C-> D-> Switch to F. Since the service is currently at node D, it will transfer the service directly to node F and then to node E, the path from node E to node C will fail, and the service will go to node E Since it needs to leave the ring (i.e. exit the shared ring network), it performs a single ring conversion operation on node E and also switches to the working tunnel, and after switching to the working tunnel, the service is now node E Because it is, it goes out from the ring directly to the node E. Refer to the portion indicated by the dotted line in FIG. 7 for the path related to the switching process.

  As shown in FIG. 8, the diagram shows that master node C has two physical links (ie, C-> E link and C-> D link) in the outbound network, and a failure occurs at the same time. The two physical links (C-> D link and C-> A) in the ring network both have a failure, and the conversion process at this time is as follows.

  When the service is transferred to the entering network through the working tunnel, it is discovered that a failure occurs in the path from node A to node C in the working tunnel and switches to the corresponding protection tunnel in the working tunnel. When the protection tunnel reaches point D via node B, the optical fiber between C and D is cut, so a conversion operation between the rings occurs at the backup node, and the service tunnel placed in the protection tunnel exits. , The service enters the outlining network at backup node D. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. Switching to the corresponding protection tunnel F-> E-> C-> D-> F because the service cannot be transferred directly to the out-node E via the working tunnel due to a path failure from node D to node C However, since the service is currently at node D, the service can be transmitted directly to node F and then to node E. Since the path from node E to node C fails and the service needs to be out of the ring to node E (ie, leaving the shared ring network) And after switching to the working tunnel and switching to the working tunnel, the service is now at node E, so it leaves node E directly out of the ring. For a path related to the switching process, reference is made to a portion indicated by a dotted line in FIG.

  As shown in Figure 9, the figure shows that the master node C has two physical links (ie C-> A link and C-> D link) in the entering network, and this The time conversion process is as follows.

  When the service communicates to the entering network through the working tunnel, it discovers that a failure occurs in the path from node A to node C in the working tunnel and switches to the corresponding protection tunnel in the working tunnel When the protection tunnel reaches point D via node B, the optical fiber between C and D is cut, so the inter-ring conversion operation occurs at the backup node, and the service tunnel placed in the protection tunnel exits. The service enters the outlining network at backup node D. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. All routes from node D to node C and from node C to node E do not fail and service reaches node E via the D-> C-> E route directly in the working tunnel, E out directly from the ring. Refer to the portion indicated by the dotted line in FIG. 9 for the path related to the switching process.

  As shown in FIG. 10, the diagram shows that master node C has two physical links in the entering network (ie, C-> A link and C-> D link) that have failed at the same time. One physical link in the network (ie, C-> E link) is the occurrence of a failure, and the conversion process at this time is as follows.

  When the service is transferred to the entering network through the working tunnel, a failure occurs in the path from node A to node C in the working tunnel, switching to the corresponding protection tunnel of the working tunnel, and the protection tunnel When the node reaches point D via node B, the optical fiber between C and D was cut, so the inter-ring conversion operation occurred on the backup node, and the service tunnel placed in the protection tunnel exited. Enter the outlining network at backup node D. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. A failure occurs in the path from node C to node E, and the service performs a single ring conversion on node C in the working tunnel and the corresponding protection tunnel F-> E-> C-> D-> F To the node E via the C-> D-> F-> E path in the protection tunnel, and then perform a single ring conversion operation on the node E, further switch to the working tunnel, After switching, the service is now at node E, so it leaves the ring directly at node E. The path related to the switching process refers to the portion indicated by the dotted line in FIG.

  As shown in FIG. 11, the figure shows that the master node C has two physical links (ie, C-> A link and C-> D link) in the entering network, and at the same time the outlining network The other physical link in (i.e., C-> D link) is the occurrence of a failure, and the conversion process at this time is as follows.

  When the service is transferred to the entering network through the working tunnel, a failure occurs in the path from node A to node C in the working tunnel, switching to the corresponding protection tunnel of the working tunnel, and the protection tunnel When node B reaches point D, the optical fiber between C and D is cut, so a ring-to-ring conversion operation occurs at the backup node, exits the service tunnel placed in the protection tunnel, and the service is backed up by the backup node. Enter the outing network with D. After entering the outbound network, the service first enters the outbound network working tunnel F-> D-> C-> E. Since a failure occurs in the path from node D to node C, the service performs a single ring conversion to node D in the working tunnel and the corresponding protection tunnel F-> E-> C-> D-> F To node E via the D-> F-> E path in the protection tunnel, and then perform a single-ring conversion operation on node E, then switch to the working tunnel and switch to the working tunnel , Because the service is currently at node E, it goes out of the ring directly to node E. For a path related to the switching process, reference is made to a portion indicated by a dotted line in FIG.

  The above contents are further detailed explanations made to the present invention with reference to specific embodiments, and it cannot be recognized that the specific implementations of the present invention are limited to these descriptions. For those skilled in the art, a number of simple reasoning or switching can be made without departing from the concept of the present invention, all of which should be regarded as belonging to the protection scope of the present invention.

  In the embodiment of the present invention, when switching between ring networks needs to be performed, switching between ring networks can be realized easily and rapidly by using a switching tunnel set for direct enter, and Since there is no need to distribute a large amount of linear LSP protection, it is possible to reduce the resources that need to be dedicated to distributing a large amount of linear LSP, improve the resource utilization, and at the same time simplify the configuration process. In addition, since it is not necessary to set the linear protection delay time, the conversion time can be further reduced, and the time required for the entire protection conversion by using the means of the embodiment of the present invention by verification should not exceed 50 ms. And the converted route matches the interactive service. For this reason, the present invention has strong industrial applicability.

Claims (8)

A dual connection ring network protection method, wherein the double connection ring network includes an enter ring network and an out ring network connected by a master node and a backup node, and the method includes:
Establishing a switching tunnel in the entering network, the switching tunnel including a main switching tunnel and a spare protection switching tunnel , the main switching tunnel having a direction from the master node to the backup node, and at least a part of the A tunnel is a point-to-point path that is directly connected to the master node and the backup node, the spare protection switching tunnel being opposite to the direction of the main switching tunnel and being a closed network consisting of all nodes in the entering network A loop path ,
When both of the two physical links of the master node in the outbound network fail, the current service is switched to the switching tunnel, and the current service is transferred to the backup node by the switching tunnel, to enter the said out-ring network by a backup node, the current service and switched to the main switching tunnel to the priority, when the main switching tunnel fails, switching to Rukoto the service to the spare protection switching tunnel, the Including
The two physical links of the master node in the outline network are a dual connection ring network protection method in which an interconnect port and a non-interconnect port of the master node are respectively located in the outline network .   The method of claim 1, wherein the spare protection switching tunnel is a closed loop tunnel. After the step of the current service entering the outlining network by the backup node, the method further comprises:
The method for protecting a dual-connection ring network according to claim 1, comprising switching the current service preferentially to a working tunnel of the out-ring network, and switching to a protection tunnel of the working tunnel when the working tunnel fails. . The step in which a failure appears in both of the two physical links in the outlining network of the master node,
Failure of only two physical links in the outlining network of the master node,
Or a failure of two physical links in the outlining network of the master node and a failure of at least one physical link in the entering network at the same time. The double connection ring network protection method according to any one of the above. A dual connection ring network protection device, wherein the dual connection ring network includes an enter ring network and an out ring network connected by a master node and a backup node;
The dual connection ring network protection device includes a path setting module and a path switching module;
The routing module establishes a switching tunnel in the entering network, the switching tunnel includes a main switching tunnel and a spare protection switching tunnel, and the main switching tunnel has a direction from the master node to the backup node. And a point-to-point path in which at least some of the tunnels are directly connected to the master node and the backup node , and the spare protection switching tunnel is opposite to the direction of the main switching tunnel, and in the entering network Set to be a closed loop path consisting of all nodes,
The path switching module switches the current service to the switching tunnel when both of the two physical links in the outline network of the master node fail, and the current service is transferred to the switching tunnel by the switching tunnel. Configured to communicate to a backup node, the path switching module includes a main path switching submodule and a spare path switching submodule;
The main path switching submodule preferentially switches the current service to the main switching tunnel when switching the current service to the switching tunnel, and if the main switching tunnel fails, the spare path switching submodule Is set to notify
The spare path switching submodule is configured to switch the current service to the spare protection switching tunnel after receiving the notification;
The two physical links in the outline network of the master node are a dual connection ring network protection device which is a physical link in which an interconnection port and a non-interconnection port in the outline network of the master node are respectively located . The double connection ring network protection device according to claim 5 , wherein the spare protection switching tunnel is a closed loop tunnel. The path switching module includes an operating path switching submodule and a protection path switching submodule;
The working path switching sub-module switches the current service to the working tunnel of the outlining network preferentially after the current service enters the outlining network by the backup node, and the working tunnel fails. , Configured to notify the protection path switching submodule,
6. The dual connection ring network protection device according to claim 5 , wherein the protection path switching submodule is configured to switch the current service to a protection tunnel of the working tunnel after receiving the notification. The failure of both of the two physical links in the outlining network of the master node
Failure of only two physical links in the outlining network of the master node,
Or two physical links in the out-ring network of the master node failure appears, any of claims 5 to 7 and at the same time at least one physical link in the enter ring network comprising fault appears A double connection ring network protection device according to claim 1.

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