Vlan Database

set igmp fast-leave

This command enables or disables IGMP Snooping fast-leave admin mode on a selected VLAN. Enabling fastleave allows the switch to immediately remove the layer 2 LAN interface, participating in the VLAN, 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. 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

set igmp fast-leave <1-3965> no set igmp fast-leave <1-3965>

<1-3965> - VLAN ID (Range: 1 – 3965).

no - This command disables IGMP Snooping fast-leave admin mode on a selected VLAN.

Default Setting

None

Command Mode

Vlan Database

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Fortinet MR1 manual Syntax Set igmp fast-leave 1-3965 no set igmp fast-leave