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XG1200 User's Guide
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4.8.2 Removing Group Members
The group members registered by IGMP snooping are removed under the following status.
If after receiving an IGMP Report message for group registration, the group member interval expires before the
XG1200 receives another IGMP Report message, it removes that group member. The default setting for the group
member interval is 260 seconds.
If an IGMP Leave message is sent from a host, the multicast router sends out an IGMP Specific Query (GSQ)
message to determine that the host has left the group.
If after receiving the IGMP Leave message, the last member interval expires before the XG1200 receives another
IGMP Report message, it removes that group member. The default setting for the last member interval is 2 seconds.