ECS4660-28F_Management Guide-R03

C HAPTER 43 | Multicast Filtering Commands
IGMP (Layer 3)
– 1516 –
COMMAND USAGE
◆ IGMPv1 does not support a configurable maximum response time for
query messages. It is fixed at 10 seconds for IGMPv1.
◆ 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.
◆ The number of seconds represented by the maximum response interval
must be less than the Query Interval (page 1516).
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 (1519)
ip igmp query-interval (1516)
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
◆ 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.
◆ 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