This command enables IGMP snooping and configures a list of multicast router ports for a specific VLAN, if IGMP snooping is globally enabled. This will enable IGMP snooping only for the specific VLAN, if IGMP snooping is globally disabled.
Any IGMP message received on a Switch is forwarded only on the router-ports and not on host ports. In this manner, the IGMP
snooping functionality avoids flooding of IGMP query messages from the host to the entire network.
The no form of the command deletes the statically configured router ports for a VLAN.
This command is a standardized implementation of the existing command; ip igmp snooping mrouter. It operates similar to the existing command.
The list of multicast router ports configured while IGMP snooping is disabled in the VLAN is applied only when the IGMP snooping is enabled in the VLAN.