3Com 8807 Command Reference Manual page 609

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Fast leaves that are configured in system view and Ethernet port view operate
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separately.
Fast leave works on all ports of the specified VLANs if you configure it in system
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view. However, it only works on the current port (e.g., when a Trunk port
belong to multiple VLANs) in the specified VLANs if you configure it in Ethernet
port view.
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CAUTION:
Fast leave configured for a port takes effect only when the VLAN it belongs to
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is IGMP-enabled.
Fast leave does not work if the corresponding specified VLANs do not exist, the
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port does not belongs to any of the specified VLANs, or the VLANs do not have
IGMP enabled.
You can enable multicast routing globally by executing the multicast
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routing-enable command before you can configure the fast leave feature.
Disabling globally-enabled multicast routing results in all existing IGMP fast
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leave-related configurations being cleared.
When you configure IGMP fast leave on aggregation ports, the configuration
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takes effect only on primary aggregation ports.
If you add an IGMP V1 host of the same multicast group to the port, or
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configure a static host of the same multicast group by using the igmp
host-join command, the switch does not remove the port when the port
receives an IGMP Leave packet of the multicast group even you enable IGMP
fast leave for the port.
Fast leave is disabled by default.
Example
# Enable IGMP fast leave on the Ethernet2/1/1 port in VLAN 5 only.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800]interface Ethernet2/1/1
[3Com-Ethernet2/1/1] igmp fast-leave vlan 5
# Disable IGMP fast leave on the Ethernet2/1/1 port in all VLANs.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] interface Ethernet2/1/1
[3Com-Ethernet2/1/1] undo igmp fast-leave
# Enable IGMP fast leave on all Ethernet ports in VLAN 5.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] igmp fast-leave vlan 5
# Enable IGMP fast leave for on all Ethernet ports except those in VLAN 5.
IGMP Configuration Commands 607