3com 8807 Reference Guide

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Isolate-user-VLAN supports the IGMP-Snooping function. After IGMP-Snooping 
is enabled under isolate-user-VLAN, all secondary VLANs are IGMP-Snooping 
enabled. It makes no sense to enable IGMP-Snooping for a secondary VLAN.

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In a secondary VLAN, IGMP packets will be directly converted and processed in 
isolate-user-VLAN, namely all the multicast services are implemented within 
isolate-user-VLAN.

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Ports in secondary VLANs cannot be used as source addresses of multicast.

# Enable IGMP Snooping in system view.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z.

 

[SW8800] igmp-snooping enable 

# Enable IGMP Snooping on VLAN 10

<SW8800> system-view

 

System View: return to User View with Ctrl+Z.

 

[SW8800] vlan 10

 

[3Com-vlan10] igmp-snooping enable 

igmp-snooping fast-leave [ vlan { vlan-id [ to vlan-id ] }&<1-10> ]

undo igmp-snooping fast-leave [ vlan { vlan-id [ to vlan-id ] } &<1-10> ]

System view, Ethernet port view

vlan { vlan-id [ to vlan-id ] }&<1-10>: Specifies any VLAN or VLAN scope for port 
you want to enable/disable the IGMP Snooping fast leave feature on. The vlan-id 
argument ranges from 1 to 4094.

Use the igmp-snooping fast-leave command to enable IGMP Snooping fast 
leave on ports or VLANs.

Use the undo igmp-snooping fast-leave command to disable IGMP Snooping 
fast leave.

You can optionally specify multiple vlan keywords for the igmp-snooping 
fast-leave command, through which you can enable IGMP Snooping fast leave in 
corresponding VLANs. If you do not specify the vlan keyword, IGMP Snooping 
fast leave is enabled in all VLANs. As mentioned earlier, the igmp-snooping 
fast-leave command can be executed in both system view and Ethernet port 
view. When you execute the command in system view, fast leave is enabled on all 
ports of the specified VLANs, otherwise, it is only enabled on the current port in 
the specified VLANs.