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Local Area High Speed Networks by Dr. Sidnie Feit

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The GARP Multicast Registration Protocol (GMRP)

The GARP (Generic Attribute Registration Protocol) Multicast Registration Protocol (GMRP) is a general Layer 2 standard that does not have the problems associated with IGMP snooping. It works efficiently and can support multicasts on behalf of any protocol, not just IP. GMRP is described in the 802.1D bridge protocol standard.

A system that wants to receive traffic sent to a particular multicast group uses GMRP to register with adjacent switches. GMRP lets hosts, switches, routers, and network monitors actively request the traffic that they want. When GMRP has been implemented, a switch will not forward multicast frames through a port that does not lead to registered recipients.

GMRP makes it ...

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