Multi-domain optical network survivability method based on identification of reliable service

Abstract

The invention relates to a survivability method based on identification of reliable service in an optical communication multi-domain optical network, which comprises the following steps that: 1) a single-domain route controller forms an interoperation control plane by automatically discovering and searching a peer route controller of the single-domain route controller by neighbors; 2) the route controller realizes topology abstraction belonging to a single domain to obtain and store aggregation routing information; 3) a source node receives service connecting requests; 4) the source node sends a route establishing request to the route controller positioned in the domain; 5) a source route controller operates an end-to-end work / protection routing algorithm based on conditional risk separating degree on a convergent network; 6) the source route controller returns a request response message to the source node and initiates a resource reservation request; 7) the source node adds the returned work / protection route into an RSVP-TE PATH message which performs path request along an appointed route; 8) a wavelength is selected through a wavelength assignment algorithm; and 9) the message is returned along the prior path of the PATH message to complete the resource reservation of the source node. The method has the advantages of high network availability and high resource utilization rate.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a survivability method based on differentiating reliability services in a multi-domain optical network. Background technique [0002] A multi-domain optical network is a network in which the network architecture is divided into Different domains, between various operators, and the network within the same operator are also divided into different domains, and each domain is managed by different operators, thus forming a multi-domain optical network. [0003] With the communications industry stepping into the era of "service is king" in an all-round way, in the face of emerging high-speed, integrated, and new types of services that span multiple optical network domains, how to effectively meet the seamless requirements across multiple optical network domains End-to-end business is one of the most important challenges that network service providers urgently need to sol...

AI Technical Summary

Problems solved by technology

[0007] (1) They only made a preliminary exploration of multi-domain protection routing at the cost of bandwidth from the perspective of routing. However, the survivability of optical networks includes two aspects of routing and wavelength allocation. Simply considering routing is not comprehensive;

[0008] (2) They all assume that the physical links are independent of each other's faults, that is, only the physical separation of the working optical path and the protection optical path needs to be considered. Undoubtedly increases the probability of simultaneous failure of the working / protection optical path, making it difficult to ensure reliable transmission of services

[0009] (3) For the defect of physical separation, the SRLG (Shared Risk Link Group) constraint proposed by IETF extends the concept of physical separation, which can reduce the risk of simultaneous failure of working / protection physical links, but SRLG is a complete risk separation Mode, does not take into account the need to distinguish reliable services, low network availability, low resource utilization

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