Method, device and system for forwarding data under protocol independent multicast dual join

Abstract

Embodiments of the present invention provide a method, an apparatus and a system for forwarding data under protocol independent multicast dual join, and relates to the field of communications, which complements a data forwarding method of a backup incoming interface under protocol independent multicast dual join in a PIM protocol, facilitates implementation of compatibility in various manufacturers, and reduces a restriction of a network topology on the application of the PIM protocol. The method includes: when a main incoming interface is up, forwarding, by a router, multicast data received from a backup incoming interface to the main incoming interface in a join state; and when the main incoming interface is down, before selecting a new main incoming interface and / or backup incoming interface, forwarding, by the router, the multicast data received from the backup incoming interface to all interfaces in a join state or to all other interfaces in a join state except the backup incoming interface.

Description

technical field [0001] The invention relates to the field of communication, in particular to a data forwarding method, router and network system under double join of protocol-independent multicast. Background technique [0002] IP multicast refers to sending data packets to a certain subset of nodes in the network in the form of best effort delivery (Best Effort) in an IP network. This subset is called a multicast group (Multicast Group). The basic idea of ​​IP multicast is that the source host only sends one copy of data, the destination address in this data is the multicast group address, and all receivers in the multicast group can receive the same data copy. [0003] Multicast traffic will be forwarded along the established multicast forwarding path. In order to transmit multicast packets to receiving sites in various directions, routers on the forwarding path may need to forward packets received from one inbound interface to multiple outbound interface. The PIM (Proto...

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Problems solved by technology

[0006] In this regard, the inventors found that after the PIM Dual Join solution was proposed, an undefined scenario in the existing PIM protocol was added, that is, there were two inbound interfaces in the PIM protocol entries, which were called the main inbound interface and the standby inbound interface respectively. The behavior of the main inbound interface has been defined in detail in the existing protocol, but the standby inbound interface has its own particularity. It not only has the attributes of an inbound interface, but also can exist as an outbound interface. For its forwarding and protocol behavior currently undefined

In this way, it is not conducive to the compatibility of various manufacturers, and the restriction of the network topology on the application of the PIM protocol is increased.

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