3com 8807 Guia Do Utilizador

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If IGMP Snooping is not enabled, carry out the igmp-snooping enable 
command in system view to enable IGMP Snooping. Then, use the same 
command in VLAN view to enable IGMP Snooping in the corresponding VLAN.

2 Multicast forwarding table set up by IGMP Snooping is incorrect.

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Carry out the display igmp-snooping group command in any view to display 
if the multicast group is the expected one.

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If the multicast group created by IGMP Snooping is not correct, turn to 
professional maintenance personnel for help.

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Continue with diagnosis 3 if the second step is completed.

3 Multicast forwarding table set up on the bottom layer is incorrect.

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In any view, carry out the display mac-address vlan command to check 
whether the MAC multicast forwarding table established in the bottom layer 
by vlan-id is consistent with that established by IGMP Snooping.

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If they are not consistent, please contact the maintenance personnel for help.