Unified electoral method of PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and IGMP (Internet Group Management Protocol) querier

Abstract

The invention discloses a unified electoral method of a PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and an IGMP (Internet Group Management Protocol) querier. According to the unified electoral method, roles of a main router in a VRRP (Virtual Router Redundancy Protocol) in the same network are introduced as reference basis in the process of electing the designated router in a PIM-SM and the querier in an IGMP, namely, the states of the designated router in the PIM-SM and the querier in the IGMP are the same as the state of the main router in the VRRP respectively, and when the state of the main router in the VRRP changes, the designated router in the PIM-SM and the querier in the IGMP are subjected to state switching synchronously. Therefore, the problem that multicast traffic cannot be correctly forwarded in the multicast because of inconformity of the designated router in the PIM-SM and the querier in the IGMP in the same network is solved, and meanwhile, the electron and switching speeds of the designated router in the PIM-SM and the querier in the IGMP are also improved.

Description

technical field [0001] The invention relates to computer network communication technology, in particular to the flow forwarding technology in computer network data communication multicast technology. Background technique [0002] In the PIM-SM (Protocol Independent Multicast-Sparse Mode, Protocol Independent Multicast-Sparse Mode) protocol, in a shared network such as Ethernet, a DR (Designated Router, Designated Router) is elected through the Hello message to be responsible for sending The Host (host) in the network distributes the multicast traffic, or receives the multicast traffic sent by the Server in the network. [0003] The designated router election mechanism stipulated in the PIM-SM protocol is as follows: [0004] When a PIM-SM-enabled interface receives a Hello packet from a neighbor, it parses the Hello packet and records three pieces of information related to DR election, such as the neighbor's primary_ip_address, dr_priority, and dr_priority_present. [0005...

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the defective of prior art, provide a kind of problem that solves the inconsistency of designated router and IGMP querier in PIM-SM in the same network, it uses VRRP (Virtual Router Redundancy Protocol, virtual router redundancy protocol) for For multicast service fault detection, the master router (Master) in VRRP of the same network is introduced as the reference for the election of the designated router and IGMP querier in PIM-SM, so that the designated router and IGMP querier in PIM-SM are unified on the same device and improve the switching speed of the multicast network from the aspects of VRRP fast detection and switching capabilities

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