Protection path calculation method, related device and system

Abstract

The invention provides a protection path calculation method, a related device and a system. Share risk link group SPLG information of each link of a working path is acquired through first nodes of a protection path. The SPLG information of each link of the working path is sole in a multi-domain scope, and correct expression of the SPLG information of of each link of the working path during cross-domain is achieved, namely, whether a certain link shares risk with another link can be distinguished correctly.By utilization of the SRLG information of each link of all the links of the working path, the protection path separated from the working path SRLG is calculated to exclude a link having the same SRLG information as any link of the working path and exclude a link having a mapping relation with a link having the same SRLG information with any link of the working path. Exclusion of a link, which should not be exluded, of a non-working path is avoided, and survivability of cross-domain business in communication network is raised effectively.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method for calculating a protection path, related equipment and a system. Background technique [0002] The survivability of the communication network is an important technical indicator of the communication network. In order to improve the survivability of the communication network, it is necessary to reduce the impact of network failures on the communication services. Therefore, multiple communication paths can be configured to improve the survivability of the communication network. If there is a problem with one of the working paths among the communication paths dealing with communication services, it is guaranteed that there is at least one path separated from the working path with the shared risk link group (Shared Risk Link Group, SRLG) besides the working path with the problem. As a protection path, communication services interrupted due to failure of the ...

AI Technical Summary

Problems solved by technology

However, each control area independently allocates and manages its own SRLG information value, so the distribution of the global SRLG information value is irregular, and different control areas may assign different SRLG information values ​​to links sharing the same risk , thus calculating a working path and its corresponding protection path, even if it is confirmed that there is no link with the same SRLG value, it cannot show that the two paths are actually separated from each other

Or, different control regions may assign the same SRLG information value to links that do not share the same risk, resulting in wrong SRLG separation, that is, two links that do not share risks cannot be used by the working path and the protection path respectively, reducing Survivability of communication network

Therefore, the SRLG separation of the working path and the protection path cannot be realized by distinguishing the SRLG information value. Currently, the links of the protection path separated from the SRLG of the working path are obtained by excluding the links corresponding to the SRLG information values ​​of all links in the working path. However, the working path The SRLG information value of each link in all the SRLG information values ​​may not be unique, by excluding the SRLG information values ​​of all links of the working path, resulting in the obtained chain of the protection path separated from the working path SRLG The number of ways is reduced, and there is a risk of excluding links that should not be excluded, thereby reducing the quality of SRLG separation

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