Administrator Guide

To clear MLD groups, use the following command:
EXEC Privilege
clear ipv6 mld groups
Debugging MLD
Display Dell Networking OS messages about the MLD process.
To display debugging messages, use the following command:
EXEC Privilege
debug ipv6 mld
Explicit Tracking
If the Querier does not receive a response to a Multicast-Address-Specific Query, it sends another. Then, after no response, it removes
the group entry from the group membership table. You can configure the system to remove specified groups immediately after receiving a
Leave message to reduce leave latency.
To configure the system to remove a group immediately after receiving a Leave message, use the following command:
INTERFACE Mode
ipv6 mld explicit-tracking
Reducing Leave Latency
Leave Latency is the amount of time after the last host leaves the MLD group that the router stops forwarding traffic for that group.
Latency is introduced because the router attempts several times to determine if there are any remaining members before stopping traffic
for the group. The Querier sends a Multicast-Address-Specific Query upon receiving a Done message to ascertain whether there are any
remain receivers for a group. The Last Listener Query Interval is the Maximum Response Delay for a Multicast-Address-Specific Query,
and also the amount of time between Multicast-Address-Specific Query retransmissions. Lowering the Last Listener Query Interval
reduces the time to detect that there are no remaining receivers for a group, and so can reduce the amount of unnecessarily forwarded
traffic.
To adjust the last-member query interval, use the following command:
INTERFACE Mode
ipv6 mld last-member-query-interval
Displaying MLD groups table
Display MLD groups. Group information can be filtered.
To display MLD groups, use the following command:
EXEC Privilege
show ipv6 mld groups
Dell#show ipv6 mld groups
Total Number of Groups: 1
MLD Connected Group Membership
Group Address Interface Mode Uptime Expires Last Reporter
Ff08::12 Vlan 10 MLDv2 00:00:12 00:02:05 1::2
Displaying MLD Interfaces
Display MLD interfaces.
To display MLD interfaces, use the following command:
INTERFACE
Multicast Listener Discovery Protocol
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