Setting the MLD Snooping Version

Context

The Multicast Listener Discovery (MLD) protocol maintains group memberships between Layer 3 multicast devices and user hosts. Two versions are available: v1 and v2. After an MLD version is configured on a Layer 2 device, the device can process MLD messages of the specified version. Generally, a Layer 2 device should use the same MLD version as the upstream Layer 3 multicast device. If MLD is disabled on the Layer 3 multicast device, the Layer 2 device must use an MLD snooping version later than or the same as that on user hosts.

If user hosts in a VLAN support different MLD versions, the Layer 2 device must be able to process the MLD packets of all these versions.

Procedure

Run system-view
The system view is displayed.
Run vlan vlan-id
The VLAN view is displayed.
Run mld-snooping version version
An MLD version is specified.

By default, the switch can process only MLDv1 packets.
When the MLD snooping version is set to MLDv2:
- The switch can use only the default Layer 2 multicast forwarding mode.
- The S2720-EI, S5720-LI, S5720S-LI, S6720-LI, S6720S-LI, S5720-SI, S5720I-SI, S5720S-SI, S5730-SI, S5730S-EI, S6720-SI and S6720S-SI forward multicast data by looking up the forwarding table according to the VLAN ID and group address.