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Method of flow engineering chain circuit state information dissemination

A technology of link state information and traffic engineering, which is applied in the field of diffusion of traffic engineering link state information in the network area, can solve problems such as reduction, and achieve the effects of improving execution efficiency, simplifying flooding process, and simplifying technology

Inactive Publication Date: 2004-05-05
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0096] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to reduce the judgment of whether the TE attribute of each TE link in the received TE-Router-LSA is an existing OSPF flooding mechanism. up-to-date complexity

Method used

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Embodiment Construction

[0105] According to the LSA diffusion process defined in the standard Open Shortest Path First OSPF protocol (RFC2328), the method for the flow engineering link state information diffusion includes the following steps:

[0106] A. When a router receives a Link State Advertisement (LSA), it searches the LSA in the Link State Database (LSDB) according to the TE attribute in the Link State Advertisement (LSA);

[0107] B. If the LSA does not exist in the link state database (LSDB), then install the LSA into the link state database (LSDB);

[0108] C. if this LSA has an instance in the link state database (LSDB), then it will be judged which update of the LSA that exists in the LSA received and the link state database (LSDB);

[0109] D. Save the latest LSA and confirm the response.

[0110] The key of the method of the present invention lies in the redesigned TE-Router-LSA, and the improved TE-Router-LSA can be used to process the LSA completely according to the processing proce...

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Abstract

In the invention, traffic engineering-link state advertising (TE-LSA) method is adopted to diffuse link state information in traffic engineering by using OSPE flood mechanism. Based on unit triplet (LS Type, Link State ID, advertising Router), LSA is searched in link state database (LSDB), here Link State ID is link index of TE, making each LSA include TE attribute of only one TE router. Comparing with prior art, since TE-Router-LSA is redesigned, the invention makes one to one correspondence between TE router and TE-Router-LSA. Thus, it is not needed to carry out comparison procedure between sequence numbers of TE-Router-LSA and sequence numbers of each TE router existed in TE-Router-LSA of TEDB.

Description

technical field [0001] The invention relates to network information transmission technology, in particular to a method for spreading flow engineering link state information in a network area. Background technique [0002] Link state routing protocol is an effective method to realize network traffic engineering (Traffic Engineering, TE). The key is to use the flood mechanism of the link state routing protocol to spread the traffic engineering link state information in the network area and achieve synchronization, so that all routers in the area have a consistent traffic engineering link state database ( TEDB); and then through the constraint-based shortest path first (CSPF) algorithm, use TEDB to calculate the constraint routing that meets the conditions. [0003] The Open Shortest Path First (OSPF) protocol is a link-state routing protocol. The topology of the OSPF routing domain can be described using the Link State Database (LSDB). Changes in topology will be reflected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/14H04L12/24H04L12/28H04L29/06
CPCH04J3/14H04L45/02H04L45/03
Inventor 彭玉龙平先军陈勇傅超
Owner HUAWEI TECH CO LTD
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