3Com Switch 8800 Advanced Software V5 Configuration Guide

Troubleshooting MLD Snooping 669
<SwitchA> system-view
[SwitchA] mld-snooping
[SwitchA-mld-snooping] quit
# Create VLAN 100 and add Ethernet1/1/3 and Ethernet1/1/1 to VLAN 100.
[SwitchA] vlan 100
[SwitchA-vlan100] port ethernet 1/1/3 ethernet 1/1/1
# Enable MLD Snooping in VLAN 100 and enable the MLD-Snooping querier
function.
[SwitchA-vlan100] mld-snooping enable
[SwitchA-vlan100] mld-snooping querier
2 Configure Switch B
# Enable MLD Snooping globally.
<SwitchB> system-view
[SwitchB] mld-snooping
[SwitchB-mld-snooping] quit
# Create VLAN 100, add Ethernet1/1/1 through Ethernet1/1/3 into the VLAN, and
enable MLD Snooping in the VLAN.
[SwitchB] vlan 100
[SwitchB-vlan100] port ethernet 1/1/1 to ethernet 1/1/3
[SwitchB-vlan100] mld-snooping enable
3 Configuration on Switch C
# Enable MLD Snooping globally.
<SwitchC> system-view
[SwitchC] mld-snooping
[SwitchC-mld-snooping] quit
# Create VLAN 100, add Ethernet1/1/1 through Ethernet1/1/3 to VLAN 100, and
enable MLD Snooping in this VLAN.
[SwitchC] vlan 100
[SwitchC-vlan100] port ethernet 1/1/1 to ethernet 1/1/3
[SwitchC-vlan100] mld-snooping enable
Troubleshooting MLD
Snooping
Switch Fails in Layer 2
Multicast Forwarding
Symptom
A switch fails to implement MLD Snooping.
Analysis
MLD Snooping is not enabled.