I believe this is not off-topic, as IGMP now is a part of almost every decent Layer-2 switch. My question is is there a default behavior for the switch when IGMP is enable and there is a steady multicast traffic from a router, but there are no Join messages coming from hosts connected to the switch. Should the switch flood this mcast traffic or block until it hears some Join packets from clients? I can't fogure it out from rfc4541 and rfc1112.
Thanks in advance for any valuable comments!