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Diffusion method for flow engineering link state

A traffic engineering and link state technology, applied in the field of communication, can solve the problems of reducing the synchronization speed of the traffic engineering link state database, increasing the bandwidth of the traffic information network, and increasing the error probability of constrained routing calculation, so as to reduce the error probability. , effective diffusion, the effect of improving efficiency

Inactive Publication Date: 2004-06-09
HUAWEI TECH CO LTD
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Problems solved by technology

[0027] The existing Opaque LSA updates all the attributes of a TE link each time, and the TE link in the optical network contains many TE attributes, so the overhead of Opaque LSA flooding is also quite large. With the intelligent optical network With the improvement of service provision speed and the expansion of network scale, the speed of TE link attribute change also increases rapidly, and the network bandwidth occupied by traffic information flooding increases significantly, which not only reduces the actual available bandwidth of the network, but also reduces the traffic engineering link status. The speed of database (TEDB) synchronization reduces the timeliness of updating TE link attributes in the entire network, thus increasing the error probability of constrained routing calculations

Method used

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Embodiment Construction

[0039] Below according to embodiment the present invention is described in further detail:

[0040] The most important reason for the inefficiency of the existing opaque link state advertisement (Opaque LSA) flooding is that it does not distinguish the frequency of different TE link attribute changes, and floods all TE link attributes each time, so that the ineffective flooding The flood information is greatly increased, which reduces the efficiency of flooding. According to the frequency of TE link attribute changes, the present invention divides different TE link attributes of the same TE link into fast-changing TE link attributes and slow-changing TE link attributes. Link attributes, and flood the two types of TE link attributes in different Opaque LSAs. When the rapidly changing TE link attributes change, only the Opaque LSA containing the rapidly changing TE link attributes is flooded; When the attribute of the slowly changing TE link changes, only the Opaque LSA containi...

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Abstract

A method for realizing flow engineering (FE) link state diffusion in optical network characterizes that according to the frequency of TE link attribute variation, different TE link attributes of a same TE link variable frequency are divided into different kinds to contain the said different kinds of TE link attributes in different LSA for flooding to make TELS to diffuse in the network zone, effectively realizing diffusion of TELS in the zone and reducing network bandwidth occupied by flood of flow information to realize TEDB synchronization quickly.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for realizing flow engineering link state diffusion in an optical network. Background technique [0002] The link state routing protocol is an effective method to realize traffic engineering (TE: Traffic Engineering). The key is to use the flood mechanism of the link state routing protocol to spread the traffic engineering link state 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 route 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 by the Link-State Database (LSDB), and changes in the topology are reflected in Link-State Advertisem...

Claims

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Application Information

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IPC IPC(8): H04L47/41
Inventor 罗贤龙彭玉龙
Owner HUAWEI TECH CO LTD
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