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Method for enhancing RSVP-TE tunnel reliability

An RSVP-TE and reliability technology, applied in the field of traffic engineering TE, can solve the problem of interrupting the sending time of ping messages

Inactive Publication Date: 2008-09-03
ZTE CORP
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Problems solved by technology

[0014] When CISCO routers are tested, two routers are directly connected, an LSP is established, and the router’s built-in Internet packet explorer ping tool is used to send ping messages on this LSP according to the default frequency, and then perform the operation of changing the label value of the LSP tail node. , the whole process will cause the LSP to interrupt the sending time of 1 ping message!

Method used

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  • Method for enhancing RSVP-TE tunnel reliability

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] At first, explain the main idea of ​​the present invention:

[0029] When the downstream node needs to change the label value, if it is the tail node of the LSP, it does not need to send the teardown message ResvTear to tear down the LSP, but directly sends the Resv message to update the label value to the upstream node; if it is not the tail node, it is also directly Send a Resv message to update the tag value to the upstream node. The content of the present invention involves two types of messages: Path messages and Resv messages.

[0030] In the second step, the content of the present invention is illustrated by way of example:

[0031] like figure 1 As shown, assume that the LSP from router R1 to R4 has been established. Now that R4 is the tail node, the label value needs to be changed. The label value before the change ...

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Abstract

The invention relates to a method for increasing the reliability of RSVP-TE tunnel. The downstream node of the TE tunnel directly sends a Resv information with updated tag value to an upstream node when requiring to change the tag value, and receiving the corresponding new and old tag values before the update is successful. The invention is suitable for unicast MPLS network. In the upstream of anLSP, whatever happened, if tag LABEL used by the device needs to change, traffic interruption will never occur in the process of changing tag in the established LSP, thereby, lost of the message passing the LSP is prevented.

Description

technical field [0001] The invention relates to the technical field of traffic engineering TE in the multi-protocol label switching MPLS technical system, in particular to a method for improving the reliability of a resource reservation protocol RSVP-TE tunnel. Background technique [0002] (1) The cause of the problem [0003] In the MPLS technical system, traffic engineering is one of the very important applications. [0004] The RSVP signaling protocol was originally used to establish the application of the Inter-Serv Qos model in the IP forwarding network, and the extension of the RSVP signaling (request for comment document RFC3209) is used to establish TE tunnels in the MPLS forwarding domain (RSVP-TE or MPLS-TE), the TE tunnel is unidirectional, so the label switching path LSP path is also unidirectional. [0005] The message types mainly included in the RSVP signaling protocol are as follows: [0006] message type describe path Used to est...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L45/50H04L47/724
Inventor 张新林周蕙菁
Owner ZTE CORP
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