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Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path

A label forwarding path and label forwarding table technology, applied in time division multiplexing systems, transmission systems, digital transmission systems, etc., can solve the problems of inability to synchronize clocks and high LSP management complexity, and achieve the effect of reducing management complexity

Active Publication Date: 2012-05-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, the technical problem to be solved by the present invention is to provide a method for establishing a bidirectional point-to-multipoint forwarding path, which can solve the problems of high management complexity of LSP in MPLS network and clock synchronization that cannot be applied to IEEE1588v2

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  • Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path
  • Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path
  • Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path

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Experimental program
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Embodiment 1

[0033] In the present embodiment, in the MPLS network, the method for using the LDP protocol to establish a bidirectional P2MP LSP includes:

[0034]Starting from at least one leaf node of the bidirectional P2MP LSP, the first label mapping message carrying the downlink label is sent to the upstream node node by node, and each node creates the downlink label forwarding table of the bidirectional P2MP LSP, and establishes the from root node to The downlink path of the leaf node;

[0035] Starting from the root node of the bidirectional P2MP LSP, the second label mapping message carrying the uplink label is sent to the downstream node node by node. The uplink path of the node;

[0036] Moreover, the uplink path and the downlink path of the bidirectional P2MP LSP pass through the same node.

[0037] In this paper, the label release message sent by a node to the downstream node for downlink path teardown is called the first label release message, and the label release message se...

Embodiment 2

[0080] Embodiment one is the process of setting up a bidirectional P2MP LSP by the LDP protocol, and this embodiment is the process of dismantling the bidirectional P2MP LSP using the LDP protocol, wherein:

[0081] In a multi-protocol label switching (MPLS) network, the process of removing at least part of the downlink path of bidirectional P2MPLSP by using the label distribution protocol can be the same as the process of removing the downlink path of unidirectional P2MPLSP in the existing label distribution protocol. Nodes interact with each other through a label revocation message carrying a downlink label and a first label release message.

[0082] In a Multiprotocol Label Switching (MPLS) network, using a label distribution protocol, tear down at least part of the uplink path of a bidirectional P2MP LSP as follows:

[0083] The leaf node to be removed of the bidirectional P2MP LSP and the intermediate node whose downstream nodes are all removed clears the uplink label for...

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Abstract

The invention discloses a method and a system for establishing a bidirectional point-to-multipoint label switched path as well as a method and a system for removing the bidirectional point-to-multipoint label switched path, wherein the establishing method is as follows: by starting from at least one bottom node of a bidirectional P2MP label switched path (LSP), the first label mapping information which carries a downlink label is sent to upstream nodes in a node-by-node way, and all the nodes build the downlink label switched table of the bidirectional P2MP LSP; and by starting from the root node of the bidirectional P2MP LSP, the second label mapping information which carries an uplink label is sent to downstream nodes which send the first label mapping information to the root node in the node-by-node way, all the nodes build the uplink label switched table of the bidirectional P2MP LSP, and the bidirectional P2MP LSP is set up. The method for establishing the bidirectional point-multipoint label switched path can solve the problems that the LSP in a multi-protocol label switching (MPLS) network has high management complexity and cannot be applied to the clock synchronization of institute of electrical and electronic engineers (IEEE) 1588v2. The invention also provides the method and the system for removing the built bidirectional point-to-multipoint label switched path.

Description

technical field [0001] The present invention relates to a method for establishing and dismantling a point-to-multipoint label forwarding path (P2MP LSP, Point to Multiple Point LabelSwitchingPath) in a multi-protocol label switching (MPLS, Multi-Protocol Label Switching) network, in particular to a method using a label distribution protocol (LDP, Label Distribution Protocol) A method and system for establishing and dismantling a point-to-multipoint label forwarding path. Background technique [0002] With the rapid development of the broadcast video service, the broadcast video service begins to be carried on the packet network, thus prompting the widespread application of the multicast technology. Due to the advantages of the MPLS technology in terms of traffic engineering, service quality, and reliability, the MPLS multicast technology has also been developed rapidly, and has been standardized in the Internet Engineering Task Force (IETF, The Internet Engineering Task Forc...

Claims

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Application Information

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IPC IPC(8): H04L12/56
CPCH04L45/50H04J3/0658H04L45/507H04J3/06H04L45/16
Inventor 陈然金利忠吴波
Owner ZTE CORP
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