Billion BiPAC 7700N User Manual page 123

Fast leave: check to determine whether to support fast leave. If this value is enabled, IGMP proxy
removes the membership of a group member immediately without sending an IGMP membership
query on downstream. This is very helpful if user wants fast channel (group change) changing in
cases like IPTV environment.
LAN to LAN (Intra LAN) Multicast: check to determine whether to support LAN to LAN (Intra LAN)
Multicast. If user want to have a multicast data source on LAN side and he want to get IGMP
snooping enabled, then this LAN-to-LAN multicast feature should be enabled.
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