Fortinet MR1 - Manual (Page 101)

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<sec> - Max time (Range: 1 – 3599).
no - This command sets the IGMP Maximum Response time on the system to 10 seconds.
Default Setting
10 seconds
Command Mode
Global Config, Interface Config.
ip igmp snooping immediate-leave
This command enables or disables IGMP Snooping fast-leave admin mode on a selected
interface or on all interfaces. Enabling fastleave allows the switch to immediately remove the
layer 2 LAN interface from its forwarding table entry upon receiving an IGMP leave message
for that multicast group without first sending out MAC-based general queries to the
interface(s).
Fast-leave admin mode should be enabled only on VLANs where only one host is connected
to each layer 2 LAN port, to prevent the inadverdent dropping of the other hosts that were
connected to the same layer 2 LAN port but were still interested in receiving multicast traffic
directed to that group. Also, fast-leave processing is supported only with IGMP version 2
hosts.
Syntax
ip igmp snooping immediate-leave
no ip igmp snooping immediate-leave
no - This command disables IGMP Snooping fast-leave admin mode.
Default Setting
Disabled
Command Mode
Global Config, Interface Config.