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Multicast distribution tree establishment method and device

A technology of multicast distribution tree and establishment method, applied in the field of multicast distribution tree establishment, can solve the problems of unable to establish multicast distribution tree, not supporting multicast PIM function router, etc.

Active Publication Date: 2015-01-14
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, this application provides a method and device for establishing a multicast distribution tree to solve the problem that a multicast distribution tree cannot be established when there are routers that do not support the multicast PIM function

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  • Multicast distribution tree establishment method and device
  • Multicast distribution tree establishment method and device
  • Multicast distribution tree establishment method and device

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The method for establishing a multicast distribution tree provided by this application is applicable to networks such as IPv4, IPv6 and PIM-SSM.

[0025] see figure 1 , figure 1 It is a schematic flowchart of a method for establishing a multicast distribution tree in the embodiment of the present application. Specific steps include:

[0026] Step 101, when the router receives the group join message, it searches the outgoing interface in the unicast routing table according to the multicast source address.

[0027] In this step, when the router receives the group join message, it creates a multicast entry according to the group join message, and adds the interface receiving the group join message to the outbound interface...

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Abstract

The invention provides a multicast distribution tree establishment method. The method includes the steps that when a router receives group jointing messages, an outgoing interface is looked for in a unicast routing table according to the multicast source address; when the found outgoing interface is a non-PIM neighbor interface, and the outgoing interface is not bound with a logic tunnel interface, the router determines a far-end router which is provided with the minimum hop counts from a upstream router to the router and supports the multicast PIM function; a tunnel is built by the router and the far-end router, and tunnel packaging is conducted on the received group jointing messages and is sent to the far-end router through the built tunnel, so that the far-end router can conduct building of a multicast distribution tree. Based on the same inventive concept, the invention further provides a multicast distribution tree establishment device, in the network containing the router which does not support the multicast PIM function, establishment of the multicast distribution tree can be achieved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for establishing a multicast distribution tree. Background technique [0002] Protocol Independent Multicast-Specified Source Multicast (Protocol Independent Multicast Source-Specific Multicast, PIM-SSM) is a multicast forwarding method that specifies a multicast source. The forwarding method is based on PIM-Sparse Mode (SM), The multicast receivers know the multicast source address S corresponding to the multicast group address G in advance, so they only need to establish the shortest path tree (Shortest Path Tree, SPT), eliminating the need for PIM-SM rendezvous point (RP) election , RP registration, shared tree (Rendezvous Point Tree, RPT) establishment, and RPT to SPT switching work, etc., have simplified a lot in terms of forwarding principles. However, it usually needs to be used in conjunction with host management protocols such as Internet Grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/761H04L45/16
Inventor 周绪龙孙策
Owner NEW H3C TECH CO LTD