# Configure VLAN 10 as the multicast VLAN and enable IGMP Snooping on it.

[SwitchB] vlan 10

[SwitchB-vlan10] service-type multicast

[SwitchB-vlan10] igmp-snooping enable

[SwitchB-vlan10] quit

#Define GigabitEthernet 1/0/10 as a hybrid port, add the port to VLAN 2, VLAN 3, and VLAN 10, and configure the port to forward tagged packets for VLAN 2, VLAN 3, and VLAN 10.

[SwitchB] interface GigabitEthernet 1/0/10 [SwitchB-GigabitEthernet1/0/10] port link-type hybrid

[SwitchB-GigabitEthernet1/0/10] port hybrid vlan 2 3 10 tagged

[SwitchB-GigabitEthernet1/0/10] quit

#Define GigabitEthernet 1/0/1 as a hybrid port, add the port to VLAN 2 and VLAN 10, configure the port to forward untagged packets for VLAN 2 and VLAN 10, and set VLAN 2 as the default VLAN of the port.

[SwitchB] interface GigabitEthernet 1/0/1 [SwitchB-GigabitEthernet1/0/1] port link-type hybrid

[SwitchB-GigabitEthernet1/0/1] port hybrid vlan 2 10 untagged

[SwitchB-GigabitEthernet1/0/1] port hybrid pvid vlan 2

[SwitchB-GigabitEthernet1/0/1] quit

#Define GigabitEthernet 1/0/2 as a hybrid port, add the port to VLAN 3 and VLAN 10, configure the port to forward untagged packets for VLAN 3 and VLAN 10, and set VLAN 3 as the default VLAN of the port.

[SwitchB] interface GigabitEthernet 1/0/2 [SwitchB-GigabitEthernet1/0/2] port link-type hybrid

[SwitchB-GigabitEthernet1/0/2] port hybrid vlan 3 10 untagged

[SwitchB-GigabitEthernet1/0/2] port hybrid pvid vlan 3

[SwitchB-GigabitEthernet1/0/2] quit

Troubleshooting IGMP Snooping

Symptom: Multicast function does not work on the device.

Solution:

Possible reasons are:

1)IGMP Snooping is not enabled.

zUse the display current-configurationcommand to check the status of IGMP Snooping.

zIf IGMP Snooping is disabled, check whether it is disabled globally or in the specific VLAN. If it is disabled globally, use the igmp-snooping enable command in both system view and VLAN view to enable it both globally and on the corresponding VLAN at the same time. If it is only disabled on the corresponding VLAN, use the igmp-snooping enable command in VLAN view only to enable it on the corresponding VLAN.

2)Multicast forwarding table set up by IGMP Snooping is wrong.

zUse the display igmp-snooping group command to check if the multicast groups are expected ones.

zIf the multicast group set up by IGMP Snooping is not correct, contact your technical support personnel.

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3Com WX3000 operation manual Troubleshooting Igmp Snooping, Symptom Multicast function does not work on the device