3com 8807 사용자 가이드

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Fast leaves that are configured in system view and Ethernet port view operate 
separately.

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The configuration made in system view will be effective to ports within all the 
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).

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If the specified VLANs do not exists, the port does not belongs to any of the 
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.

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You must enable multicast routing globally by executing the multicast 
routing-enable command in system view before you can configure the fast 
leave feature.

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If global multicast routing is disabled, all existing IGMP fast leave-related 
configurations will be cleared.

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When you configure IGMP fast leave on aggregation ports, the configuration 
takes effect only on primary aggregation ports.

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If you have added an IGMP V1 host of the same multicast group to the port, or 
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.

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:

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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 
VLAN 200. Configure the interface of VLAN 100 to be the proxy interface of 
the interface of VLAN 200.

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