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Method, head node and tail node of forwarding multicasting message

A technology of multicast message and tail node, which is applied in the field of network communication, can solve the problem that multicast message cannot be forwarded and processed, and achieve the effect of reasonable application

Inactive Publication Date: 2009-11-25
NEW H3C TECH CO LTD
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Problems solved by technology

[0004] Although the MPLS TE tunnel has the above advantages, but because the current MPLS TE tunnel is only used for unidirectional packet forwarding, that is, it is a unidirectional tunnel, and the forwarding of multicast packets is based on the shortest path established by adding or pruning packets Tree (SPT, Shortest Path Tree), and the sending of joining or pruning messages is opposite to the sending of multicast messages. Therefore, the existing MPLS TE tunnels cannot be used for forwarding and processing of multicast messages.

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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The method provided by the present invention mainly includes: the head node of the MPLS TE tunnel sends a Path (Path) message to the tail node of the MPLS TE tunnel via the main LSP of the MPLS tunnel; the tail node of the MPLS TE tunnel obtains the MPLS TE message from the Path message. The multicast address range supported by the tunnel, record the interface connected to the last node of the main LSP and the previous hop as the reverse path forwarding (RPF) interface of the multicast; the requested multicast address within the multicast address range The join message is forwarded through the MPLS TE tunnel; after the head node receives the join message sent by the tail node, it adds the MPLS TE tunnel interface to the SPT outbound interfac...

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Abstract

The invention provides a method, head node and tail node of a forwarding multicasting message, where the method includes: the head node the multiprotocol label switching (MPLS) traffic engineering (TE) tunnel transmits the path message to the tail node of the MPLS TE tunnel through the main label switching path of the MPLS TE tunnel; the tail node acquires the range of the multicasting address supported by the MPLS TE tunnel from the path message; the tail node transmits the adding message in the multicasting address range by the requested multicasting address through the MPLS TE tunnel; after the head node receives the adding message transmitted by the tail node, the head node adds the MPLS TE tunnel interface to the shortest path tree (SPT) outlet interface list corresponding to the multicasting address requested by the adding message; after the head node receives the multicasting message, the head node transmits the multicasting message according to the SPT outlet interface list corresponding to the multicasting address of the multicasting message.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for forwarding multicast messages, a head node and a tail node. Background technique [0002] Traffic Engineering (TE, Traffic Engineering) is a method widely used in the current network for balancing distribution, with the goal of preventing the bandwidth of some links in the network from being overused while the bandwidth of other links is not fully utilized. When TE is combined with Multi Protocol Label Switching (MPLS, Multi Protocol Label Switch) technology, it can be used to solve the network congestion problem in the MPLS network, and the TE tunnel established in the MPLS network is called an MPLS TE tunnel. [0003] Packets on the MPLS TE tunnel are forwarded based on the label through the pre-established Label Forwarding Path (LSP). Nodes in the MPLS TE tunnel except the head node and the tail node do not need to perform table entry query. Labels ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/46H04L12/18H04L45/16
Inventor 蒋益群沈岭
Owner NEW H3C TECH CO LTD
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