IGMP - Leaving a group
Example:
- Hosts 1 and 3 are not interested to group A anymore
- Host 2 sends a report for group A
- Host 3 is not interested to B any more: delete group B from the LAN
Query to 224.2.0.1 (group A): any one still interested? (YES!)
Send unsubscribe for A to 224.0.0.2
Send unsubscribe for B to 224.0.0.2
Send a report to 224.2.0.1 (group A)
Query to 224.5.5.5 (group B): any one still interested? (NO!)