3Com 8807 Configuration Manual page 451

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IGMP Configuration
Example
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Fast leaves that are configured in system view and Ethernet port view operate
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separately.
The configuration made in system view will be effective to ports within all the
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specified VLANs, while the configuration in port view will be effective to the
port within the specific VLANs (for example, when a trunk port belongs to
multiple VLANs).
CAUTION:
If the specified VLANs do not exists, the port does not belongs to any of the
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specified VLANs, or the VLANs do not have IGMP enabled, you can still
configure the fast leave feature, but the configuration will not take effect.
You must enable multicast routing globally by executing the multicast
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routing-enable command in system view before you can configure the fast
leave feature.
If global multicast routing is disabled, all existing IGMP fast leave-related
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configurations will be 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 have added an IGMP V1 host of the same multicast group to the port, or
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configured 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 if you have enabled
IGMP fast leave for the port.
Network requirements
As shown in Figure 109, Switch B resides in a leaf network. Configure IGMP proxy
for Switch B to ease the configuration and management work load in the leaf
network without affecting multicast connections in it.
You need to perform the following configurations to meet the requirements:
Enable IGMP and PIM-DM for the related VLAN interfaces on Switch A.
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Enable multicast on Switch B. Enable PIM for the interfaces of VLAN 100 and
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VLAN 200. Configure the interface of VLAN 100 to be the proxy interface of
the interface of VLAN 200.
The following depicts IGMP and IGMP proxy configuration (other related
configuration is not covered here).
IGMP Configuration 451