group membership timeout has expired, the routing device stops forwarding
remotely-originated multicast packets for that group onto the attached network.
By default, host-query messages are sent every 125 seconds. You can change this interval
to change the number of IGMP messages sent on the subnet.
To modify the query interval:
1. Configure the interval.
[edit protocols igmp]
user@host# set query-interval 200
The value can be from 1 through 1024 seconds.
2. Verify the configuration by checking the IGMP Query Interval field in the output of the
show igmp interface command.
3. Verify the operation of the query interval by checking the Membership Query field in
the output of the show igmp statistics command.
Related
Documentation
Understanding IGMP on page 445•
• Modifying the IGMP Query Response Interval on page 451
• Modifying the IGMP Robustness Variable on page 456
• show igmp interface
• show igmp statistics
Modifying the IGMP Query Response Interval
The query response interval is the maximum amount of time that can elapse between
when the querier router sends a host-query message and when it receives a response
from a host. Configuring this interval allows you to adjust the burst peaks of IGMP
messages on the subnet. Set a larger interval to make the traffic less bursty. Bursty traffic
refers to an uneven pattern of data transmission: sometimes a very high data transmission
rate, whereas at other times a very low data transmission rate.
The query response interval, the host-query interval, and the robustness variable are
related in that they are all variables that are used to calculate the group membership
timeout. The group membership timeout is the number of seconds that must pass before
a multicast router determines that no more members of a host group exist on a subnet.
The group membership timeout is calculated as the (robustness variable x query-interval)
+ (query-response-interval). If no reports are received for a particular group before the
group membership timeout has expired, the routing device stops forwarding remotely
originated multicast packets for that group onto the attached network.
451Copyright © 2017, Juniper Networks, Inc.
Chapter 14: Configuring Internet Group Management Protocol
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