Method and device for determining forwarding path in multi-topology structure

A technology of forwarding path and topology structure, which is applied in the branch office to provide special service devices, data exchange details, digital transmission system, etc., and can solve the problems of IPv6 message loss and error

Active Publication Date: 2014-03-26
CHINA TELECOM CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When IS A calculates its IPv6 topology, due to the use of the intermediate system reachability information of DIS E of broadcast network Y, A may mistakenly select IS A->IS C->IS D as the forwarding path of IPv6, and then Causes the loss of IPv6 packets

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  • Method and device for determining forwarding path in multi-topology structure
  • Method and device for determining forwarding path in multi-topology structure
  • Method and device for determining forwarding path in multi-topology structure

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Embodiment Construction

[0023] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention.

[0024] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0025] In the prior art, when selecting a non-pseudo node, that is, when specifying an intermediate system, it does not pay attention to whether the device supports IPv4 and IPv6, so the original selection method is likely to select a device that only supports IPv4 or only supports IPv6, making it impossible to cover all topology, resulting in routing errors. In the following embodiments of the present invention, when selecting the specified...

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Abstract

The embodiment of the invention discloses a method and a device for determining a forwarding path in a multi-topology structure. The method comprises the following steps: whether each broadcast network has ISs containing a topology supported by all ISs in the broadcast network is judged; if the broadcast network has ISs containing a topology supported by all the ISs in the broadcast network, an IS is optionally selected from the ISs supported by all the ISs in the broadcast network as a DIS, and the DIS separately sends IS accessibility TLVs of the topologies to all the topologies in the broadcast network; if the broadcast network does not have ISs containing a topology supported by all the ISs in the broadcast network, a DIS is selected for each topology in the broadcast network, and the DIS of each topology issues the IS accessibility TLV of the topology; and when the DIS sends a non-pseudo node LSP, each topology independently adds DIS information reaching the topology in the IS accessibility TLV thereof so as to determine a forwarding path of data in the topology according to the DIS information reaching the topology. According to the embodiment of the invention, the data in each topology is enabled to be correctly forwarded.

Description

technical field [0001] The present invention relates to an IPv6 (Internet Protocol Version 6, Internet Protocol Version 6) communication network, in particular to a method and device for determining a forwarding path in a multi-topology structure. Background technique [0002] IS-IS (Intermediate System To Intermediate System Routing Protocol, intermediate system to intermediate system routing protocol) was originally developed by ISO (the International Organization of Standardization, International Organization for Standardization) as CLNP (Connection-Less Network Protocol, connection-less network protocol ) is a dynamic routing protocol designed by IETF (Internet Engineering Task Force, Internet Engineering Task Force) has expanded IS-IS in RFC1195, so that IS-IS can be applied to TCP / IP (Transmission Control Protocol / Internet Protocol, Transmission Control Protocol / Internet Internet Protocol) at the same time In the environment of OSI (Open Systems Interconnection, Open ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/701H04L12/18
Inventor 陈怡
Owner CHINA TELECOM CORP LTD
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