Troubleshooting igmp snooping – H3C Technologies H3C S3600 Series Switches User Manual

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# Create VLAN 2, VLAN 3 and VLAN 10, configure VLAN 10 as the multicast VLAN, and then enable

IGMP Snooping on it.

[SwitchB] vlan 2 to 3

Please wait.... Done.

[SwitchB] vlan 10

[SwitchB-vlan10] service-type multicast

[SwitchB-vlan10] igmp-snooping enable

[SwitchB-vlan10] quit

# Define Ethernet 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 Ethernet 1/0/10

[SwitchB-Ethernet1/0/10] port link-type hybrid

[SwitchB-Ethernet1/0/10] port hybrid vlan 2 3 10 tagged

[SwitchB-Ethernet1/0/10] quit

# Define Ethernet 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 Ethernet 1/0/1

[SwitchB-Ethernet1/0/1] port link-type hybrid

[SwitchB-Ethernet1/0/1] port hybrid vlan 2 10 untagged

[SwitchB-Ethernet1/0/1] port hybrid pvid vlan 2

[SwitchB-Ethernet1/0/1] quit

# Define Ethernet 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 Ethernet 1/0/2

[SwitchB-Ethernet1/0/2] port link-type hybrid

[SwitchB-Ethernet1/0/2] port hybrid vlan 3 10 untagged

[SwitchB-Ethernet1/0/2] port hybrid pvid vlan 3

[SwitchB-Ethernet1/0/2] quit

Troubleshooting IGMP Snooping

Symptom: Multicast function does not work on the switch.

Solution:

Possible reasons are:

1) IGMP Snooping is not enabled.

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

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.

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

ones.

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

personnel.

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