C
HAPTER
39
| Multicast Filtering Commands
IGMP (Layer 3)
– 939 –
COMMAND USAGE
When the switch receives an IGMPv2 or IGMPv3 leave message from a host
that wants to leave a multicast group, source or channel, it sends a
number of group-specific or group-source-specific query messages at
intervals defined by this command. If no response is received after this
period, the switch stops forwarding for the group, source or channel.
EXAMPLE
Console(config)#interface vlan 1
Console(config-if)#ip igmp last-member-query-interval 20
Console(config-if)#
ip igmp max-resp-
interval
This command configures the maximum response time advertised in IGMP
queries. Use the no form of this command to restore the default.
SYNTAX
ip igmp max-resp-interval seconds
no ip igmp max-resp-interval
seconds - The report delay advertised in IGMP queries.
(Range: 0-255 tenths of a second)
DEFAULT SETTING
100 (10 seconds)
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
â—† IGMPv1 does not support a configurable maximum response time for
query messages. It is fixed at 10 seconds for IGMPv1.
â—† By varying the Maximum Response Interval, the burstiness of IGMP
messages passed on the subnet can be tuned; where larger values
make the traffic less bursty, as host responses are spread out over a
larger interval.
â—† The number of seconds represented by the maximum response interval
must be less than the Query Interval (page 940).
EXAMPLE
The following shows how to configure the maximum response time to 20
seconds.
Console(config-if)#ip igmp query-max-response-time 200
Console(config-if)#
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