A kind of redundant protection method and device

Abstract

The present invention provides a redundant protection method and device; the redundant protection method implemented in the first router includes: selecting a unique active interface and several passive interfaces for the first protection group from the interfaces of the first router; The interfaces of the protection group all perform the function of distributing or receiving multicast traffic; only activate the bidirectional forwarding detection protocol of the active interface in the first protection group, so that the active interface of the first protection group can establish interaction with the active interface of the second protection group; All the interfaces of the second protection group are selected from the interfaces of the second router as the backup interfaces of the first protection group; there is only one active interface in the second protection group; when the second router passes the active interface of the second protection group When the interface detects that the active interface of the first protection group fails, all the interfaces in the second protection group perform the function of distributing or receiving multicast traffic. The invention can effectively reduce BFD sessions.

Description

technical field [0001] The invention relates to the communication field, in particular to a redundancy protection method and device. Background technique [0002] [RFC4601] The standard protocol defines the DR (Designated Router, Designated Router) election process, and this standard process is completed through the PIM Hello message. If the current DR fails, other PIM (Protocol-Independent Multicast, protocol-independent multicast) routers need to wait until the neighbor relationship times out to discover this event, thereby triggering the convergence of multicast routing. During this process, the time for multicast data transmission to be interrupted Will be no less than the timeout of the neighbor relationship, so it is usually in seconds. [0003] It should be noted that although any number of PIM interfaces that form a neighbor relationship will elect a unique DR, the only DR is only between the source end and the IGMP (Internet Group Management Protocol, Internet Grou...

AI Technical Summary

Problems solved by technology

However, as the number of DR / BDR pairs increases, the number of BFD sessions that need to be maintained also increases. When the number of sessions reaches hundreds or thousands, once these sessions go down for some reason at the same time, a large number of packets will be generated. , causing the switching time to reach the second level, which cannot meet the protection requirements of the carrier level

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