WO2010048772A1

WO2010048772A1 - Method for connection restoring in the automatic switched optical network and routing domain

Info

Publication number: WO2010048772A1
Application number: PCT/CN2009/000856
Authority: WO
Inventors: 高鹏; 付锡华; 孙德胜
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-10-30
Filing date: 2009-07-30
Publication date: 2010-05-06
Also published as: CN101729936A; CN101729936B

Abstract

A method for connection restoring in the automatic switched optical network and a routing domain of automatic switched optical network in the optical network field are provided in the invention, the routing domain of the automatic switched optical network is a protection domain or restoration domain, there is a containment relationship between the routing domains, when a routing domain occurs connection trouble and the connection can not be restored, the routing domain informs the greater routing domain which contains the routing domain, the greater routing domain will restore the connection. The method and the routing domain in the invention can improve the efficiency of accomplishing the connection trouble restoration by the combination of the protection and the restoration.

Description

Automatic switched optical network connection repair method and routing domain

Technical field

The present invention relates to the field of optical networks, and in particular, to an automatic switched optical network connection repair method and a routing domain.

Background technique

An optical network, such as OTN (Optical transmission network, optical transmission network), WDM (Wavelength-division multiplexing , wavelength division multiplexing), SDH (Synchronous digital hierarchy, SDH-based bad ¹ J) or SONET (Synchronous optical network, Synchronous Optical The network) transmission network has been widely used in the field of telecommunications.

Automatic switched optical network (ASON) is a research hotspot in the field of optical networks in recent years. The ITU-T G.8080 recommendation proposes the concept of ASON, which is implemented by setting up a special Control Plane (CP). Protection and recovery are technologies that guarantee connection availability and are key technologies in ASON, as defined in ITU-T G.8080.

ITU-T G.8080 has a detailed description of the inter-domain (Intra Domain) recovery method, including Hard Rerouting and Soft Rerouting, which provide recovery mechanisms for multiple domains. The implementation framework.

However, neither the ITU-T G.8080 nor the ITU-T G.7715 enacted now mentions the inclusion relationship between the recovery routing domain and the protection routing domain, nor does it complete through the combination of protection and recovery. A description of the connection fix. Summary of the invention

The technical problem to be solved by the present invention is to provide a connection repairing method for an automatic switched optical network and an automatic switched optical network routing domain, so as to improve the efficiency of completing connection fault repair through a combination of protection and recovery.

In order to solve the above problems, the present invention provides a connection repair method for an automatic switched optical network. The routing domain of the automatic switching optical network is a protection domain or a recovery domain, and the routing domain has an inclusion relationship. When a routing domain has a connection failure and the connection cannot be repaired, the routing domain notifies a larger routing domain that includes the routing domain. Connection repair by the larger routing domain;

The method includes the following steps:

( a) A routing domain detects a connection failure;

(b) the routing domain performs connection repair. If the connection repair is successful, the process ends, otherwise skip to step (c);

(c) notifying the connection failure message to the larger routing domain containing the routing domain;

(d) If the larger routing domain is the largest routing domain and the connection repair is successful, the process ends. Otherwise, the user is notified that the connection repair fails. If the larger routing domain is not the largest routing domain, then the process jumps to step (b).

Further, when the routing domain in step (b) performs connection repair, first notify the source node and the destination node of the routing domain by the connection failure information, and then the source node and the destination node take protection or recovery actions to repair the connection. . Further, the connection repair method of the protection domain is to switch the work connection to the protection connection, and the connection repair method of the recovery domain is to establish a recovery connection.

To solve the above technical problem, the present invention further provides a routing domain for automatically exchanging an optical network, where the routing domain is a protection domain or a recovery domain, and the domains have an inclusion relationship, and the routing domain is used to detect connection failures and repair connections. When a connection failure occurs in the domain and the connection cannot be repaired, it is also used to notify a larger protection or recovery domain that contains the domain, and the connection is fixed by the larger protection or recovery domain.

Further, the routing domain includes a plurality of nodes, and the node is configured to detect a connection status, and notify a boundary node of the routing domain where the connection failure is located, where the boundary node is used to repair the connection, and when the connection repair fails, The notification includes the boundary node of the larger routing domain of the routing domain, where the boundary node refers to the source node and the destination node of each routing domain.

Further, the node includes a link resource management module and a connection control module, where the link resource management module is configured to detect a link state, and notify the node connection control module of the link state information;

The connection control module is used for connection establishment and connection maintenance, including link state information Notify the connection control module of other nodes.

Further, the border node of the protection domain further includes a network call controller, configured to control an intra-domain connection state; and the connection control module of the protection domain border node is further configured to notify the network controller of the node of the connection status information.

Further, the connection control module of the recovery domain is further configured to establish a recovery re-routing, query the routing control module for the recovery route, and establish a restoration connection according to the query result of the routing control module.

Further, the connection repair method of the protection domain is a handover work connection to a protection connection, and the repair method of the recovery domain is to establish a recovery connection.

The method and the routing domain of the present invention are based on the protection and recovery method, improve the availability of the service connection through the combination of protection and recovery, protect and restore the cooperation to complete the service repair, avoid the confusion caused by the protection and recovery of the respective actions, and improve the completion of the connection failure. The efficiency of the repair is simple and reliable. DRAWINGS

1 is a schematic flow chart of a connection repairing method in an automatic switched optical network according to the present invention.

2 is a schematic diagram of a nested relationship between a protection domain and a recovery domain of the present invention.

Figure 3 is a schematic diagram of the switch from the working connection to the protection connection between the first and last nodes after the working connection failure is detected in the protection domain.

Figure 4 is a schematic diagram of the first and last nodes of the protection domain after the failure of the working connection in the protection domain.

Figure 5 is a schematic diagram of the first node of the recovery domain that does not fix the faulty connection in the protection domain and informs the fault information of the protection domain.

Figure 6 is a schematic diagram of establishing a recovery connection alternative failure connection in the recovery domain.

FIG. 7 is a schematic diagram of node interaction in which the protection connection fails again after the working connection failure in the protection domain. detailed description In the automatic switched optical network, the protection and recovery coordination (Coordination) is implemented by the control plane. The protection and recovery need to establish connection routes in the domain. Therefore, the control plane protection domain (CP protection domain) and the recovery domain are referred to. (Restoration domain, also called "recovery rerouting domain") belongs to the routing domain, so the protection domain and the recovery domain also have the inter-domain inclusion relationship defined by ITU-T G.8080.

The protection and recovery domains may present different inclusion relationships, such as the protection domain containing the protection domain, the protection domain including the protection domain, the protection domain including the recovery domain, and the more heavy inclusion relationships derived therefrom. The main idea of the present invention is that When a protection or recovery domain fails and the connection cannot be repaired, the domain notifies the larger protection or recovery domain that contains the domain, and the connection is fixed by the larger protection or recovery domain.

The method for repairing the connection domain of the automatic switched optical network routing domain of the present invention is as shown in FIG. 1 (including the following steps:

Step 201: A related ASON node of a routing domain detects that a fault occurs in the service connection. Step 202: The ASON node that detects the fault notifies the fault to the source ASON node and the destination ASON node of the connection protection/recovery domain where the fault is located.

Step 203: The connection protection/recovery domain source and destination ASON node receive a failure notification, and take a protection/recovery action in the protection/recovery domain;

Step 204: If the protection/recovery is successful, the process ends, and if the protection/recovery fails, the larger protection/recovery domain including the protection/recovery domain is notified;

Step 205: Receive a notification, if it is the maximum protection/recovery domain and the protection/recovery is successful, the process ends, otherwise the user protection/recovery failure is notified, and if it is not the maximum protection/recovery domain, the process jumps to step 203.

The core of the invention is to utilize the protection relationship between the protection and recovery domains, and realize the combination of protection and recovery through the cooperation relationship between the routing domains, thereby completing the protection or recovery process of the connection.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 2, the service connection in the application instance passes through the recovery domain A and the protection domain C. The nested relationship between the domains is that the recovery domain A contains the recovery domain B and the protection domain C. Two failures are taken as an example to illustrate an embodiment of the present invention.

The service work connection in the protection domain C first fails. As shown in Figure 3, the connection repair method includes the following steps:

Step A1. In the protection domain C, the service connection [A, C, E, F] node C and node E have a transmission link failure, and nodes C and E detect the failure;

Step B2, node C and node E respectively notify the node A and the node F of the fault information, as shown by la and lb in Fig. 2, and the notify mode can use the notify message of the RSVP protocol;

Step C3, Node A and Node F receive the failure notification, take the protection action, and switch the service from the working connection [A, C, E, F] to the protection connection [A, B, D, F], as shown in Figure 2. The steps 2a and 2b are shown.

The protection mode of the protection domain C can be protected by 1:1, M:N or 1+1 SNCP.

Step D4: In the protection domain C, the service connection is successfully repaired, and the process ends.

After the working connection failure, when the protection connection in the protection domain C fails again and the original working connection has not been restored, as shown in Figure 3, the connection repair method protects the following steps:

Step A2, in the protection domain C, the service protection connection [A, B, D, F] node B and D transmission link failure, nodes B and D detect the failure;

Step B2, Nodes B and D respectively notify the nodes A and F of the fault information, as shown in 3a and 3b of FIG. 4, and the notify mode can use the notify message of the RSVP protocol;

Step C2: Nodes A and F receive the failure notification, and there is no additional capacity in the protection domain C to support the protection switching action;

Step D2: The protection in the protection domain C fails. The node A notifies the source node G in the recovery domain A of the protection domain C. As shown in FIG. 5, the notification mode can use the notify message of the RSVP protocol.

Step E2: The recovery domain A is the largest recovery domain, receives the notification, and the node G retrieves the recovery action, and calculates the recovery connection route [G, H, I, J, K], as shown in FIG. 5 to FIG. Connection, instead of a faulty connection, the process ends.

Establishing a recovery connection can use source routing or hierarchical routing, and can be used in accordance with ITU-T. The RSVP protocol or CR-LDP protocol specified in G.7713.

In order to implement the above method, the present invention automatically exchanges an optical network ASON routing domain, which is a protection domain or a recovery domain, and has an inclusion relationship between domains. The routing domain is used to detect connection failures and repair connections. When the domain fails and the connection cannot be repaired. It is also used to notify a larger protection or recovery domain that contains the domain, and the connection is fixed by the larger protection or recovery domain.

The connection repair method of the protection domain is a handover work connection to a protection connection, and the repair method of the recovery domain is to establish a recovery connection.

The routing domain includes a plurality of nodes, and the node is configured to detect a connection status, and notify a boundary node of the routing domain where the connection failure is located, where the end node is used to repair the connection, and when the connection repair fails, the notification includes the location The boundary node of the larger routing domain of the routing domain, where the end node refers to the source node and the destination node of each routing domain.

The node includes a link resource management module LRM, a connection control module CC, and a routing control module RC, and the boundary node of the domain further includes a network call controller NCC, where

a link resource management module LRM, configured to detect a link status, and notify the node connection control module of the link status information;

The connection control module CC is used for connection establishment and connection maintenance, and includes a connection control module CC that notifies link state information to other nodes;

The connection control module of the border node is further configured to notify the network controller NCC of the node of the connection status information;

The connection control module of the recovery domain is further configured to establish a recovery re-routing, query the routing control module RC for a recovery route, and establish a recovery connection according to the query result of the routing control module;

Network Call Controller NCC is used to control the connection status in the domain.

In order to better clarify the method of the present invention, in conjunction with FIG. 4, FIG. 5, FIG. 6 and FIG. 7, the connection path of the connection establishment is resumed after the protection connection fails again, and the control plane component interacts with the steps: Step A3, Node B and Link resource management component in the D node (Link Resource Managers) Referred to as LRM), a two-way link failure is detected, and the fault is notified to the respective connection control module (Connection Controller abbreviated as CC), as shown by la and lb in FIG. 7;

Step B3, CC _B notifies CC _{A of} the fault information, and CC _D notifies CC _{F of the} fault information; as shown in steps 2a and 2b in FIG. 7;

Step C3, CC _A CC _F, respectively, and the failure information to the network call controller (Network

Call Controller (NCC) NCC _A and NCC _F , as shown in 3a and 3b in Figure 7;

Steps D3, NCC _A and NCC _F identify that there is no additional capacity protection fault connection, and notify CC _A and CC _F as shown in 4a and 4b of FIG. 7;

Step E3, CC _A notifies the protection failure information to the CC _G to send the protection failure information from the protection domain C to the recovery domain A, and the notification information includes the protection failure domain information required for the route backtracking (crankback), as shown in FIG. Show

Step F3, CC _G initiates recovery of rerouting, queries RC _G for recovery of the route, and RC _G returns to the recovery route [G, H, I, J, K] of the failure protection domain as shown in FIG.

Step G3 and CC _G complete the restoration connection establishment according to the source routing mode, as shown in FIG. 7 to FIG. 7, which is in accordance with the ITU-T G.8080 source route establishment procedure.

It can be seen from the above embodiment that the present invention is based on the protection and recovery method proposed by ITU-T G.8080, improves the availability of service connections through the combination of protection and recovery, and protects and restores cooperation to complete service repair, avoiding protection and Recover the confusion caused by the respective actions, improve the efficiency of completing the connection failure repair, and have the advantages of simplicity and reliability.

Of course, the present invention may have other various embodiments, such as the protection domain including the recovery domain and the protection domain and the recovery domain having various nesting manners, without departing from the spirit and essence of the present invention, familiar changes and modifications. All should fall within the scope of protection of the appended claims. Industrial applicability

The method and the routing domain of the present invention are based on the protection and recovery method, improve the availability of the service connection through the combination of protection and recovery, protect and restore the cooperation to complete the service repair, avoid the confusion caused by the protection and recovery of the respective actions, and improve the completion of the connection failure. The efficiency of the repair is simple and reliable.

Claims

Claim

A connection repairing method for an automatic switched optical network, where the routing domain in the automatic switched optical network is a protection domain or a recovery domain, and the routing domain has an inclusion relationship, which includes: when a routing domain has a connection failure and the connection cannot be When repaired, the routing domain notifies the larger routing domain that contains the routing domain, and the larger routing domain performs connection repair.

2. The method of claim 1 further comprising the steps of:

( a) A routing domain detects a connection failure;

(b) The routing domain performs connection repair. If the connection repair is successful, the process ends, otherwise step (c);

(c) the routing domain notifies the connection failure message of a larger routing domain containing the routing domain;

(d) If the larger routing domain is the largest routing domain and the connection repair is successful, the process ends; otherwise, the user is notified that the connection repair fails, and if the larger routing domain is not the largest routing domain, then the step (b) is jumped.

3. The method according to claim 2, wherein, in the step (b), when the routing domain performs connection repair, the connection failure information is first notified to the source node and the destination node of the routing domain, and then the source node And the destination node retrieves a protection or recovery action to repair the connection.

4. The method according to claim 1, wherein the connection repair method of the protection domain is a handover work connection to the protection connection, and the connection repair method of the recovery domain is to establish a recovery connection.

A routing domain for automatically exchanging an optical network, which is a protection domain or a recovery domain, and has an inclusion relationship between the domains, where the routing domain is set to detect a connection failure and repair a connection, and when the connection failure occurs in the domain and the connection cannot be repaired , also set to notify the larger protection or recovery domain that contains the domain, and the connection is fixed by the larger protection or recovery domain.

6. The routing domain of claim 5 and said larger protection domain or recovery domain, each comprising a plurality of nodes, said node being configured to detect a connection status and notify the boundary node of the routing domain of the connection failure, The boundary node is set to repair the connection, and when the connection repair fails, the boundary node of the larger routing domain including the routing domain is notified, wherein the boundary node refers to the source node and the destination of each routing domain. Node.

The routing domain according to claim 6, wherein the node includes a link resource management module and a connection control module, where

The link resource management module is configured to detect a link state, and notify the node connection control module of the link state information;

The connection control module is configured to establish connection and connection maintenance, and includes a connection control module that notifies link status information to other nodes.

8. The routing domain of claim 7, wherein the border node of the protection domain further comprises a network call controller, the network call controller is configured to control a connection state in the domain; and the connection control of the boundary node of the protection domain The module is also set to notify the network controller of the node of the connection status information.

9. The routing domain of claim 7, wherein the connection control module of the recovery domain is further configured to establish a recovery re-routing, query a routing control module for a recovery route, and establish a recovery connection according to a query result of the routing control module.

The routing domain of claim 5, wherein the connection repairing method of the protection domain is a handover working connection to a protection connection, and the repairing method of the recovery domain is to establish a recovery connection.