Ring protection switching method adopting multi-protocol label switching transport profile (MPLS TP) and node

Abstract

The invention discloses a ring protection switching method adopting a multi-protocol label switching transport profile (MPLS TP) and a node. The method comprises the following steps of: deploying a totally-enclosed protection LSP (Label Switching Path) on an MPLS TP ring, wherein the LSP is shared by all working LSPs and is in a direction opposite to all working LSPs, and different merging labels are distributed for every working LSP; when a first node receives a user message from a node outside the ring or the working LSPs under the condition that the first node and a second node on the ring are not communicated with an adjacent node, the first node on the protection LSP is a downstream node of the adjacent node and the second node is an upstream node of the adjacent node, pressing the merging label into the message or switching a working label on the message into the merging label and adding a protection label on the message; and when the message reaches the second node from the protection LSP and the protection label of the message is popped from the second node, switching the merging label of the message into the working label. Under the condition that only one protection LSP is used, the protection switching complexity is lowered.

Description

technical field [0001] The invention relates to the technical field of ring networks, in particular to a multi-protocol label switching transport technology (MPLS TP, Multi-protocol Label Switching Transport Profile) ring protection switching method and nodes in the MPLS TP ring. Background technique [0002] For the convenience of understanding, the explanation of the following terms is first given: [0003] MPLS: A technology for packet forwarding through label actions. [0004] Forwarding Equivalence Class (FEC, Forwarding Equivalence Class): It is an important concept in MPLS. MPLS is a classification and forwarding technology, which groups packets with the same characteristics (same destination or same service level, etc.) into one category, which is called FEC. Packets belonging to the same FEC will be treated exactly the same on the MPLS network. [0005] Nexthop Label Forwarding Entry (NHLFE, Nexthop Label Forwarding Entry): used for MPLS forwarding, NHLFE contain...

AI Technical Summary

Problems solved by technology

[0047] In the prior art, the protection switching method for the Wrapping mode ring network failure is relatively easy to solve the link failure protection, but when solving the node failure protection, the working label exchange on the adjacent node of the failure node needs to be specially processed. This increases the processing complexity

[0048] In the prior art, when the T-MPLS shared protection ring fails, the disadvantage of the protection switching method is that one protection LSP ring can only protect one working LSP, which increases the complexity of LSP deployment

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