Chapter 24
| Multicast Filtering Commands
IGMP (Layer 3)
– 771 –
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 771).
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)#
Related Commands
ip igmp version (774)
ip igmp query-interval (771)
ip igmp query-interval This command configures the frequency at which host query messages are sent.
Use the no form to restore the default.
Syntax
ip igmp query-interval seconds
no ip igmp query-interval
seconds - The frequency at which the switch sends IGMP host-query
messages. (Range: 1-255 seconds)
Default Setting
125 seconds
Command Mode
Interface Configuration (VLAN)
Command Usage
â—† Multicast routers send host query messages to determine the interfaces that
are connected to downstream hosts requesting a specific multicast service.
Only the designated multicast router for a subnet sends host query messages,
which are addressed to the multicast address 224.0.0.1, and uses a time-to-live
(TTL) value of 1.
â—† For IGMP Version 1, the designated router is elected according to the multicast
routing protocol that runs on the LAN. But for IGMP Version 2 and 3, the
designated querier is the lowest IP-addressed multicast router on the subnet.
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