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Multicast Listener Discovery | 609
• Debug MLD on page 611
• MLD Snooping on page 611
Change MLD Timer Values
All non-queriers have a timer that is refreshed when it hears a General Query. If the timer expires, then the
router can assume that the Querier is not present, and so it assumes the role of Querier. The Other Querier
Present Interval, or Querier Timeout Interval, is the amount of time that passes before a non-querier router
assumes that there is no longer a Querier on the link.
The Query Interval is the amount of time between General Queries sent by the Querier.
Reduce Host Response Burstiness
General Queries contain a Query Response Interval value, which is the amount of time the host has to
respond to a general query. Hosts set a timer to a random number less than the Query Response Interval
upon receiving a general query, and send a report when the timer expires. Increasing this value spreads host
responses over a greater period of time, and so reduces response burstiness.
Reduce 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. There are two
parameters you can configure to reduce leave latency.
Task Command Syntax Command Mode
Adjust the querier-timeout value.
ipv6 mld querier-timeout
Default: 255 seconds
INTERFACE
Task Command Syntax Command Mode
Adjust the query interval.
ipv6 mld query-interval
Default: 125 seconds
INTERFACE
Task Command Syntax Command Mode
Adjust the Query Response Interval.
ipv6 mld query-max-resp-time
Default: 10 seconds
INTERFACE