9-3. GMRP
GMRP is an industry standard multicast flooding control protocol defined in IEEE 802.1p.
A host uses both IGMP (Layer 3) and GMRP (Layer 2) to coordinate its multicast activities. When it wants to join a multicast group, it sends an IGMP join request along with a GMRP join request.
The switch forwards IGMP control packets on to the multicast router. GMRP traffic is used by the switch to determine which switch ports to add to a multicast group.
The switch periodically queries hosts with a GMRP leave-all message. Hosts that want to continue participating in a multicast group must respond with a join request. If not, they can either send a GMRP leave message or just not respond at all.
Configuration
1. | Enable GMRP.
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