IGMPv2
Distributed with the mrouted source code
Has a querier election protocol (lowest IP address)
Hosts may send a “Leave group” message to “all routers” (224.0.0.2) address
- Querier responds with a Group-specific Query message to see if any group members are available
- Lower leave latency => responds quickly to membership changes
Router alert IP option is also enabled
Bunch of rules for coexistence of IGMPv1 and v2 hosts and routers on a single subnet