Configuring MLD Options for Default and Non-Default VRFs

MLDv1 is the default MLD version when IPv6 PIM Sparse Mode (PIM-SM) is enabled on an interface. You must configure MLDv2 on an interface to enable MLDv2.

The following option configurations are outlined in the following steps:

• Modify the group membership time: Group membership time defines how long a group will remain active on an interface in the absence of a group report. Values range from 5 through 26000 seconds; the default is 260.
• Modify the MLD query interval: Frequency at which multicast listening discovery (MLD) query messages are sent. Values range from 2 through 3600 seconds; the default is 125. The MLD query interval value you enter must be greater than the interval configured for the maximum response time.
• Last Listener Query Interval: The maximum response delay inserted into Multicast-Address-Specific Queries sent in response to done messages, and is also the amount of time between Multicast-Address-Specific Query messages. When the device receives an MLDv1 leave message or an MLDv2 state change report, it sends out a query and expects a response within the time specified by this value.
• Modify the maximum response time: The maximum amount of time a multicast listener has to respond to queries. Values range from 1 through 50 seconds; the default is 10 seconds.
• Modify the maximum number of MLD group addresses: Any MLD group memberships exceeding the group limit are not processed. Values range from 1 through 8192; the default is 4096.
• Robustness: The number of times that the switch sends each MLD message from an interface. Use a higher value to ensure high reliability from MLD. Values range from 2 through 7; the default is 2.

The following steps show how to configure these options for a specific VRF named blue. You can enable IPv6 PIM using the ipv6 router pim command without specifying a VRF to make these options apply to the default VRF.