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

Abstract

The present application provides a multicast data forwarding method and device applied to multi-homing networking. This method is applied to the switching device in the multi-homing network, including: monitoring the neighbor relationship message sent by each router sharing the same network segment with the device to establish the neighbor relationship; when the device receives the neighbor relationship message, Identify whether the designated router DR priority value carried by the neighbor relationship message is a set value, and the set value is used to indicate that the router sending the neighbor relationship message is a non-DR; when the neighbor relationship message carries the election DR priority When the level value is not the set value, modify the DR priority value of the election DR carried by the neighbor relationship message to the set value, and forward the modified neighbor relationship message to other routers to trigger other routers Use the modified DR priority value to elect a DR. By adopting the present invention, multiple routers can share the multicast forwarding pressure and realize 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: DesignatedRouter) election, building shared tree (RPT: RendezvousPointTree), 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 He...

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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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