Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network

A protocol-independent multicast and multicast forwarding table technology, applied in data exchange networks, data exchange details, digital transmission systems, etc., can solve the problems of equipment impact, equipment cache, packet loss, etc., to speed up removal and avoid periodic impact, build high-efficiency effects

Active Publication Date: 2011-08-17
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stream-driven method will have a great impact on the device, and the forwarding can only be done after the table entry is established, which requires the device to cache and wait, and there is a possibility of delay and packet loss

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  • Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network
  • Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network
  • Method and device for establishing multicast forwarding table entry in bidirectional protocol independent multicast (PIM) network

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] figure 2 A flow chart of a method for establishing a multicast forwarding entry in a bidirectional PIM network provided by an embodiment of the present invention, such as figure 2 As shown, the specific steps are as follows:

[0027] Step 201: Before sending the multicast flow for a multicast group G, the bidirectional PIM multicast source sends an IGMPv1 report (Report) message, which carries the address of the multicast group G and the bidirectional PIM multicast source at the same time The IGMP join indication.

[0028] In this embodiment, when starting a bidirectional PIM application, such as starting a video conference, the multicast source immediately sends an IGMPv1Report message.

[0029] The format of the IGMPv1Report message is as follows:

[0030] 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 ...

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Abstract

The invention discloses a method and device for establishing a multicast forwarding table entry in a bidirectional protocol independent multicast (PIM) network. In the method, a directly-connected device of a bidirectional PIM multicast source receives first protocol messages from the multicast source aiming at a multicast group G; a table entry (*,G) is established in accordance with the protocol messages; an outbound interface of the table entry is the RPF interface of the directly-connected device, and second protocol messages are sent from the RPF interface along an RP direction; the second protocol messages are used for indicating upstream equipment to establish a table entry (*,G), and an outbound interface of the table entry is the RPF interface of the upstream equipment; and the first protocol messages are sent before the bidirectional PIM multicast source sends multicast streams aiming at the multicast group G. According to the method and device provided by the invention, the bidirectional PIM forwarding efficiency is improved.

Description

technical field [0001] The invention relates to the field of multicast technology, in particular to a method and equipment for establishing multicast forwarding entries in a bidirectional Protocol Independent Multicast (PIM, Protocol Independent Multicast) network. Background technique [0002] A bidirectional Protocol Independent Multicast (PIM, Protocol Independent Multicast) protocol assumes that a multicast source is also a receiver, and is applicable to scenarios such as video conferencing. However, in actual networking, there may not be receivers on the path from the multicast source to the rendezvous point (RP, Rendezvous Point), but in order to forward the traffic smoothly, a forwarding table entry corresponding to the group needs to be established on the path from the multicast source to the RP to forward multicast traffic. [0003] figure 1 An example network diagram of an existing two-way PIM is given, as shown in figure 1 As shown, there are two receivers in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L45/16H04L12/18
Inventor 沈岭周迪
Owner NEW H3C TECH CO LTD
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