Multicast Listener Discovery | 609• Debug MLD on page 611• MLD Snooping on page 611Change MLD Timer ValuesAll non-queriers have a timer that is refreshed when it hears a General Query. If the timer expires, then therouter can assume that the Querier is not present, and so it assumes the role of Querier. The Other QuerierPresent Interval, or Querier Timeout Interval, is the amount of time that passes before a non-querier routerassumes 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 BurstinessGeneral Queries contain a Query Response Interval value, which is the amount of time the host has torespond to a general query. Hosts set a timer to a random number less than the Query Response Intervalupon receiving a general query, and send a report when the timer expires. Increasing this value spreads hostresponses over a greater period of time, and so reduces response burstiness.Reduce Leave LatencyLeave Latency is the amount of time after the last host leaves the MLD group that the router stopsforwarding traffic for that group. Latency is introduced because the router attempts several times todetermine if there are any remaining members before stopping traffic for the group. There are twoparameters you can configure to reduce leave latency.Task Command Syntax Command ModeAdjust the querier-timeout value. ipv6 mld querier-timeoutDefault: 255 secondsINTERFACETask Command Syntax Command ModeAdjust the query interval. ipv6 mld query-intervalDefault: 125 secondsINTERFACETask Command Syntax Command ModeAdjust the Query Response Interval. ipv6 mld query-max-resp-timeDefault: 10 secondsINTERFACE
