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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Adjusting Query and Response Timers

The querier periodically sends a general query to discover which multicast groups are active. A group must have at least one host to be active.

When a host receives a query, it does not respond immediately, but rather starts a delay timer. The delay time is set to a random value between 0 and the maximum response time. The host sends a response when the timer expires; in version 2, if another host responds before the timer expires, the timer is nullified, and no response is sent.

The maximum response time is the amount of time that the querier waits for a response to a query before taking further action. The querier advertises this value in the query (refer to the illustration in IGMP Version 2). Lowering this value decreases leave latency but increases response burstiness because all host membership reports must be sent before the maximum response time expires. Inversely, increasing this value decreases burstiness at the expense of leave latency.

When the querier receives a leave message from a host, it sends a group-specific query to the subnet. If no response is received, it sends another. The amount of time that the querier waits to receive a response to the initial query before sending a second one is the last member query interval (LMQI). The switch waits one LMQI after the second query before removing the group from the state table.

  • Adjust the period between queries.
    INTERFACE mode
    ip igmp query-interval
  • Adjust the time period between queries used to discover IPv6 multicast groups.
    Interface mode
    ipv6 mld query-interval
  • Adjust the maximum response time.
    INTERFACE mode
    ip igmp query-max-resp-time
  • Adjust the maximum amount of time that the querier waits, for an IPv6 query response, before taking further action.
    Interface mode
    ipv6 mld query-max-response-time
  • Adjust the last member query interval.
    INTERFACE mode
    ip igmp last-member-query-interval
  • Adjust the amount of time the querier waits, for the initial query response, before sending the next IPv6 query.
    Interface mode
    ipv6 mld last-member-query-interval

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