Method for establishing optimistically PIM-DM route table entry

A PIM-DM and routing technology, applied in the field of network communication, can solve problems such as network delay, CPU impact, packet loss, etc., to reduce forwarding delay and avoid impact.

Active Publication Date: 2006-03-01
NEW H3C TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] Since it takes a certain amount of time for the software to process and refresh the hardware table entries, receiving a large number of multicast streams during the period from receiving the multicast stream to refreshing the hardware table entries will have a certain impact on the CPU. The multicast stream can only be forwarded by hardware after the item is set. Therefore, the multicast stream has not been forwarded between refreshes under the hardware table item, resulting in certain network delays and packet loss.

Method used

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  • Method for establishing optimistically PIM-DM route table entry
  • Method for establishing optimistically PIM-DM route table entry

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Embodiment Construction

[0032] The core of the present invention is for the PIM-DM (Protocol Independent Multicast-Dense Mode) multicast router that has learned a new PIM neighbor, the (Source, Group) multicast routing table entry of this equipment is in the form of a forged multicast stream It is sent to the newly learned PIM neighbors, so that the new PIM neighbors can quickly establish multicast routing entries. Specifically: when the upstream PIM-DM multicast router receives the multicast flow, construct a multicast source address as S and a multicast group address as G according to the (S, G) multicast routing table entry of the multicast flow A forged multicast flow, and send the forged multicast flow to the learned downstream PIM-DM multicast router; the downstream PIM-DM multicast router receives the forged multicast flow, obtains the Forge the multicast source address and multicast group address in the multicast flow, and use it to establish (S, G) multicast routing table entries; when the d...

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Abstract

A method for setting up PIM-DM route table item includes learning to down stream new PIM-DM router by up stream PIM-DM router , setting up pseudo multicast stream by up stream PIM-DM router and sending it to down stream new PIM-DM neighbour router , setting up multicast route table item by down stream new PIM-DM neighbour router according to received pseudo multicast stream , judging whether said table item is included in device multicast list or not and setting up new multicast route table item in said list as well as adding relevant retransmitting interface to refresh hardware retransmitting table item if it is not included.

Description

technical field [0001] The invention relates to network communication technology, in particular to a method for optimizing and establishing a Protocol Independent Multicast-Dense Mode (PIM-DM, Protocol Independent Multicast-Dense Mode) router multicast entry. Background technique [0002] The multicast routing protocol is a routing control protocol that implements multicast message forwarding on the third layer of IP (Internet Protocol) network. The function of the multicast routing protocol is to provide routing information for the forwarding of multicast packets, that is, to indicate to the forwarding engine which direction the received multicast packets should be forwarded to. There are three types of commonly used IP multicast routing protocols: DVMRP (Distance Vector Multicast Routing Protocol), PIM-SM (Protocol Independent Multicast Routing Protocol Sparse Mode) and PIM-DM (Protocol Independent Multicast Routing Protocol Dense Mode ). [0003] The PIM-DM (Protocol In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L12/56H04L45/74
Inventor 孙广新
Owner NEW H3C TECH CO LTD
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