IGMPv2 and IGMPv3 snooping querier with IRB

This feature supports IGMPv2 and IGMPv3 snooping querier operation on Layer 2 networks using integrated routing and bridging (IRB). When no multicast router is present, you can configure the device to act as an IGMP querier and send periodic general query messages to maintain multicast group membership and keep IGMP snooping tables current. This helps prevent multicast traffic loss and limits multicast forwarding to interfaces with interested receivers.