•Host:
•sends Membership Report
messages, if joined
•waits 0-10 sec (def).
•Hosts listen to other
host reports
•Only 1 host responds
•Join messages
(unsolicited Membership Report) to group address (e.g.
224.10.8.5)
•Leave messages to All
Routers (224.0.0.2)
•IGMPv1/2 reports group
membership ONLY – No sources
•