mld-snooping querier enable
Function
The mld-snooping querier enable command enables the MLD snooping querier in a VLAN.
The undo mld-snooping querier enable command disables the MLD snooping querier in a VLAN.
By default, the MLD snooping querier is disabled in a VLAN.
Usage Guidelines
Usage Scenario
On an MLD-capable network, a Layer 3 multicast device functions as the querier to send MLD Query messages and maintain group memberships on the local network segment. If the Layer 3 multicast device does not run MLD or it uses only static multicast forwarding entries, it cannot function as a querier. You can enable MLD snooping querier on the downstream Layer 2 device. Then the Layer 2 device can act as a querier to send MLD Query messages.
On a Layer 2 network without Layer 3 devices, multicast sources are connected to Layer 2 devices. MLD snooping querier needs to be enabled on the Layer 2 devices so that they can maintain multicast group memberships.
Prerequisites
MLD snooping has been enabled globally using the mld-snooping enable command.
Follow-up Procedure
- Set the interval at which the MLD snooping querier sends General Query messages using the mld-snooping query-interval command.
- Set the interval at which the MLD snooping querier sends Multicast-Address-Specific Query messages using the mld-snooping last-listener-query-interval command.
- Set the query count using the mld-snooping robust-count command.
Precautions
The configuration takes effect only after you run the mld-snooping_enable command to enable MLD snooping in the VLAN.
The MLD snooping querier function and MLD snooping proxy cannot be enabled in the same VLAN.
If multicast VLAN replication is configured, the MLD snooping querier function cannot be enabled in user VLANs.
