Timers Used in IGMPvl and IGMPv2

Table 19-4 summarizes important timers used in IGMPvl and IGMPv2, their usage, and default values.

Table 19-4 Important Timers Used in IGMPv1 andIGMPv2

KEY POINT

Table 19-4 Important Timers Used in IGMPv1 andIGMPv2

KEY POINT

Timer

Usage

Default Value for IGMPvl

Default Value for IGMPv2

Query Interval

A time period between General Queries sent by a router.

60 seconds

125 seconds

Query Response Interval

The maximum response time for hosts to respond to the periodic general Queries.

Fixed at 10 seconds

10 seconds , can be between .1 and 25.5 seconds

Group Membership Interval

A time period during which if a router doesn't receive an IGMP Report, the router concludes that there are no more members of the group on the subnet.

180 seconds

260 seconds

Other Querier Present Interval

A time period during which if the IGMPv2 non-querier routers don't receive an IGMP Query from the querier router, the non-querier routers conclude that the querier is dead.

255 seconds

Last Member Query Interval

The maximum response time inserted by IGMPv2 routers into the Group-Specific Queries and the time period between two consecutive Group-Specific Queries sent for the same group.

1 second

Version 1 Router Present Timeout

A time period during which if an IGMPv2 host doesn't receive an IGMPv1 Query, the IGMPv2 host concludes that there are no IGMPv1 routers present and starts sending IGMPv2 messages.

400 seconds

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