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Designated router (DR) election method and router

A router and option technology, applied in branch offices providing special services, data exchange details, digital transmission systems, etc., can solve the problems of multicast traffic forwarding interruption, unable to correctly forward multicast traffic, etc., so as to avoid multicast traffic forwarding. effect of interruption

Active Publication Date: 2011-11-09
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the DR is switched to A, the unicast routing table of A may not be fully prepared at this time, which makes A unable to forward multicast traffic correctly.
[0005] It can be seen that the existing DR election mechanism does not consider some special cases. The DR device elected by the DR election algorithm based on full preemption may be a router that is not fully ready, which may cause interruption of multicast traffic forwarding.

Method used

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  • Designated router (DR) election method and router
  • Designated router (DR) election method and router
  • Designated router (DR) election method and router

Examples

Experimental program
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Embodiment Construction

[0022] The present invention proposes a method for electing a DR, which is applied to a PIM network including multiple routers, such as figure 2 A flowchart of a method for electing a DR in the present invention, the method includes:

[0023] Step 201: Each router in the PIM network sends a Hello message carrying a runtime option; the runtime option includes the time the router has been running and the initial state duration of the router's expected PIM network;

[0024] Step 202: each router receives the Hello message sent by each router in the PIM network, and selects a router to participate in DR election among all routers in the PIM network according to the running time option carried in the Hello message, The DR is elected among the routers participating in the election; the router participating in the DR election is a router that starts running no later than the time when the PIM network starts to stabilize.

[0025] the following to figure 1 The PIM network shown is ...

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Abstract

The invention discloses a designated router (DR) election method and a router. The method comprises that: each router in a protocol independent multicast (PIM) network transmits a Hello message carrying a running time option, wherein the running time option comprises the running time of the router and PIM network initial state duration expected by the router; and each router receives the Hello message from each router in the PIM network, selects the routers taking part in DR election from all the routers of the PIM network according to the running time option carried by the Hello message, and elects a DR from the routers taking part in the election, wherein the running of each router taking part in the DR election is started at a moment not later than the moment at which the PIM gets stable.

Description

technical field [0001] The present invention relates to the technical field of Protocol Independent Multicast-Sparse Mode (PIM-SM, Protocol Independent Multicast-Sparse Mode), in particular to a designated router (DR, DesignatedRouter) election method and router. Background technique [0002] In the PIM-SM protocol, one of the multiple routers in the PIM network is elected as the DR, and the DR will be the only forwarder of multicast information in the PIM network, responsible for receiving multicast traffic from The broadcast traffic is forwarded to the client. [0003] The mode of DR election is: each router in the PIM network periodically sends Hello (Hello) message to each other, and this Hello message carries the DR priority of this router; DR priority, elect the router with the highest DR priority as the DR of the PIM network. If the DR priorities are the same, the router with the largest IP address is selected as the DR. When the DR fails, a new DR election process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/18H04L29/06H04L45/28
Inventor 哈达
Owner NEW H3C TECH CO LTD
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