3Com Switch 4500 26-Port Configuration Manual page 162

Switch 4500 family 26-port, 50-port, pwr 26-port, pwr 50-port

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Diagnosis 3:

Multicast forwarding table set up on the bottom layer is wrong.

1 Enable IGMP Snooping group in user view and then input the command

igmp-snooping group

layer and that created by IGMP Snooping is consistent. You may also input the

display mac vlan

table under vlanid in the bottom layer and that created by IGMP Snooping is

2 If they are not consistent, refer to Technical Support for assistance.

to check if MAC multicast forwarding table in the bottom

command in any view to check if MAC multicast forwarding

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Troubleshooting