Specifying Immediate-Leave Host Removal For Igmp - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Specifying Immediate-Leave Host Removal for IGMP

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The default query response interval is 10 seconds. You can configure a subsecond interval
up to one digit to the right of the decimal point. The configurable range is 0.1 through 0.9,
then in 1-second intervals 1 through 999,999.
To modify the query response interval:
Configure the interval.
1.
[edit protocols igmp]
user@host# set query-response-interval 0.4
Verify the configuration by checking the IGMP Query Response Interval field in the
2.
output of the show igmp interface
Verify the operation of the query interval by checking the Membership Query field in
3.
the output of the
show igmp statistics
Understanding IGMP on page 445
Modifying the IGMP Host-Query Message Interval on page 450
Modifying the IGMP Robustness Variable on page 456
show igmp interface
show igmp statistics
The immediate leave setting is useful for minimizing the leave latency of IGMP
memberships. When this setting is enabled, the routing device leaves the multicast group
immediately after the last host leaves the multicast group.
The immediate-leave setting enables host tracking, meaning that the device keeps track
of the hosts that send join messages. This allows IGMP to determine when the last host
sends a leave message for the multicast group.
When the immediate leave setting is enabled, the device removes an interface from the
forwarding-table entry without first sending IGMP group-specific queries to the interface.
The interface is pruned from the multicast tree for the multicast group specified in the
IGMP leave message. The immediate leave setting ensures optimal bandwidth
management for hosts on a switched network, even when multiple multicast groups are
being used simultaneously.
When immediate leave is disabled and one host sends a leave group message, the routing
device first sends a group query to determine if another receiver responds. If no receiver
responds, the routing device removes all hosts on the interface from the multicast group.
Immediate leave is disabled by default for both IGMP version 2 and IGMP version 3.
command.
command.
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