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
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[0032] Example one
[0033] In this embodiment, in the MPLS network, the method for establishing a bidirectional P2MP LSP using the LDP protocol includes:
[0034] Starting from at least one leaf node of the bidirectional P2MP LSP, each node sends the first label mapping message carrying the downlink label to the upstream node. Each node creates the downlink label forwarding table of the bidirectional P2MP LSP, and establishes the bidirectional P2MP LSP from the root node to the The downstream path of the leaf node;
[0035] Starting from the root node of the bidirectional P2MP LSP, node by node sends a second label mapping message carrying an uplink label to downstream nodes, and each node creates an uplink label forwarding table for the bidirectional P2MP LSP, and establishes the bidirectional P2MP LSP from the leaf node to the root Node's uplink path;
[0036] In addition, the uplink path and downlink path of the bidirectional P2MP LSP pass through the same node.
[0037] In the te...
Example Embodiment
[0079] Example two
[0080] The first embodiment is the process of establishing a bidirectional P2MP LSP through the LDP protocol. This embodiment is the process of dismantling the bidirectional P2MPLSP using the LDP protocol, in which:
[0081] In a multi-protocol label switching (MPLS) network, the label distribution protocol is used to remove at least part of the downstream path of the bidirectional P2MPLSP, which can be the same as the removal of the unidirectional P2MPLSP downstream path in the existing label distribution protocol. The nodes interact with the first label release message through the label revocation message carrying the downlink label.
[0082] In a multi-protocol label switching (MPLS) network, the label distribution protocol is used to remove at least part of the upstream path of the bidirectional P2MP LSP in the following manner:
[0083] The leaf node to be removed of the bidirectional P2MP LSP and the intermediate node whose all downstream nodes have been rem...
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