3Com SuperStack 4 Configuration Manual page 164

176 C 7: M
HAPTER ULTICAST
IGMP Snooping Fault
Diagnosis and
Troubleshooting
P
ROTOCOL
Networking Diagram
Figure 42 IGMP Snooping configuration network
Router
Switch
Configuration Procedure
Enable IGMP Snooping globally.
[SW5500]igmp-snooping enable
Enable IGMP Snooping on VLAN 10.
[SW5500]vlan 10
[SW5500-vlan10]igmp-snooping enable
Fault: Multicast function cannot be implemented on the switch.
Troubleshooting:
Diagnosis 1: IGMP Snooping is disabled.
1 Input the
display current-configuration
IGMP Snooping.
2 If the switch disabled IGMP Snooping, check whether the IGMP Snooping is
enabled globally and also enabled on the VLAN. If IGMP Snooping is not enabled
globally, first input the
then input the
igmp-snooping enable
Snooping is not enabled on the VLAN, input the
command in VLAN view.
Diagnosis 2: Multicast forwarding table set up by IGMP Snooping is wrong.
1 Input the
display igmp-snooping group
group is the expected one.
2 If the multicast group created by IGMP Snooping is not correct, refer to Technical
Support for assistance.
3 Continue with diagnosis 3 if the second step is completed.
Internet
Multicast
igmp-snooping enable
command in VLAN view. If IGMP
command to display the status of
command in System View and
igmp-snooping enable
command to display if the multicast