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Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP)

A ring network, fast technology, applied in the field of data communication, can solve the problems of inconsistent protection paths and bandwidth waste, and achieve the effect of improving ring network performance and saving bandwidth

Inactive Publication Date: 2010-11-24
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above scheme is a fast protection scheme based on APS messages, which has the disadvantages of wasting bandwidth and adopting inconsistent protection paths with those of the Steering protection mode.

Method used

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  • Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP)
  • Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP)
  • Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Embodiment 1. The situation where the ring network fails:

[0084] Such as Figure 5a As shown, the ring network contains nodes A, B, C, D, E, F and G, and the links contained are , , , , and links. LISP1 is a label switching path from node A to node D, and its working path and working label are described as:

[0085] A{W1}→B{W2}→C{W3}→D;

[0086] The protection path and protection label are:

[0087] A{P1'}→F{P2'}→E{P3'}→D;

[0088] Such as Figure 5b As shown in , the link of the ring network fails, and node B blocks the forwarding function of the data packets of the adjacent port of the failed link, and at the same time transmits the data flow to the LSP on the upper ring on the working path and the protection path , and periodically send SF messages (with information) along the intact port, the processing method of node C is the same as that of node B.

[0089] After the ring ports of other nodes on the ring receive the SF message, they first extract the ...

Embodiment 2

[0090] Embodiment 2, the case where the ring network fault disappears

[0091] Such as Figure 6a As shown, when the failure of the link of the ring network disappears, the node B continues to block the forwarding function of the data message of the port, and starts the WTR timer (Wait Timer).

[0092] When the WTR timer expires, such as Figure 6b As shown, Node B releases the forwarding function of the data message of the blocked port, and sends no request message (NR message) periodically along the two ports on the ring at the same time, at the same time, for the LSP on the ring of Node B The data flow is transmitted on the working path. For node C, the processing method is the same as that of node B.

[0093] When the ring ports of other nodes on the ring receive the SF message, they first extract the information in the message, and compare it with the stored by themselves. If they are the same, it means that the message is a repeated message. If they are different, t...

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Abstract

The invention discloses a method for fast protecting a ring network based on a multi-protocol label switching transport profile (MPLS-TP). The method is implemented when the 1) ring network goes wrong and the 2) ring network inversely recovers. The method ensures that an Ethernet multi-ring network can converge within 50ms after link switching. Compared with the conventional Wrapping protection scheme, the scheme saves bandwidths and can be well matched with a Steering protection scheme, which has great significance for improving the performance of the ring network based on the MPLS-TP technology.

Description

technical field [0001] The invention relates to the field of data communication, in particular to an MPLS-TP-based fast ring network protection method. Background technique [0002] MPLS (Multi-protocol Label Switching, referred to as Multi-protocol Label Switching) is the most important technology in today's packet switching network. It has developed from point-to-point to point-to-multipoint. It is necessary to supplement powerful OAM (operation and management) functions in MPLS. MPLS-TP (MPLS Transport Profile, namely: MPLS transmission framework) is proposed under this background. It is a joint work composed of ITU-T and IETF The protocol family developed by the JWT group involves multiple technologies such as OAM, survivability, network management and control plane, and aims to improve the function and interoperability of the transport network. IETF is mainly completed by working groups such as MPLS, CCAMP, PWE3 and L2VPN. ITU-T has also formulated some standards, such...

Claims

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Application Information

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IPC IPC(8): H04L12/437H04L12/56H04L12/70
Inventor 王斌
Owner NANJING UNIV OF POSTS & TELECOMM
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