IGMP v2

Improvements in IGMP v2:

1. Queries can be sent from the router to either all-hosts group, or members of a specific group
2. Hosts can dynamically leave groups
3. Querier election
4. Query interval response time

When a host wishes to leave a group, it sends a 'leave-group' message to 224.0.0.2

IGMP version is configured on an interface basis:

ip igmp version {1 2 3}

Router sends membership query to group specific address, host responds:
3 60.008772 172.16.40.1 224.0.0.1 IGMP V2 Membership Query, general
4 64.003868 172.16.40.10 239.255.255.250 IGMP V2 Membership Report / Join group 239.255.255.250