Multicast data forwarding method and multicast data forwarding device applied to multi-homing networking

Abstract

The invention provides a multicast data forwarding method and a multicast data forwarding device applied to multi-homing networking. The method is applied to switching equipment in multi-homing networking, and includes the steps: monitoring neighbor relation messages used for establishing neighbor relation and sent by routers sharing the same network segment with the equipment; when the equipment receives the neighbor relation messages, identifying whether a campaign DR (designated router) priority value included in the neighbor relation messages is a set value or not, wherein the set value is used for indicating that the router sending the neighbor relation messages is a non-designated router; and when the campaign DR priority value included in the neighbor relation messages is not the set value, modifying the campaign DR priority value included in the neighbor relation messages to the set value, and forwarding the modified neighbor relation messages to other routers so as to trigger other routers to utilize the modified campaign DR priority value to elect the DR. By the method and the device, multiple routers can jointly bear multicast forward pressure to achieve load sharing of multicast traffic.

Description

technical field [0001] The present application relates to network communication technology, in particular to a multicast data forwarding method and device applied to multi-homing networking. Background technique [0002] At present, with the development of services such as interactive network television and video conferencing, multicast services are more and more widely used on existing networks. The following uses the common Sparse Mode Independent Multicast Protocol (PIM-SM: Protocol Independent Multicast-Sparse Mode) as an example to describe the working mechanism of the multicast protocol: [0003] The working mechanism of PIM-SM mainly includes: neighbor discovery, designated router (DR: Designated Router) election, building shared tree (RPT: Rendezvous Point Tree), multicast source registration, etc. [0004] Neighbor discovery means that routers sharing the same network segment discover adjacent neighbors by exchanging Hello packets. [0005] DR election is based on...

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Problems solved by technology

Assume that router A is elected as the DR, and routers B and C are correspondingly non-DRs. Although routers A, B, and C share the same network segment, since the DR is the only forwarder of multicast data, all multicast traffic forwarding on the entire network segment is performed by Router A as the DR is completed, while routers B and C as non-DRs are idle, which will cause the multicast forwarding pressure to be concentrated on the DR, which cannot achieve balanced traffic sharing, and will also cause the upstream bandwidth of the non-DR to be idle

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