3com WX3000 Manuel D’Utilisation

 

2-19 

# 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 

Symptom: Multicast function does not work on the device. 

Solution: 

Possible reasons are: 

1)  IGMP Snooping is not enabled. 

z 

Use the display current-configuration command to check the status of IGMP Snooping. 

z 

If 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. 

z 

Use the display igmp-snooping group command to check if the multicast groups are expected 

ones. 

z 

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

personnel.