NOTE: When enabling promiscuous-mode, all routers on the ethernet
segment must be configured with the promiscuous mode statement.
Otherwise, only the interface configured with lowest IPv4 address acts as
the querier for IGMP for this Ethernet segment.
To enable IGMP promiscuous mode on an interface:
1. Configure the IGMP interface.
[edit protocols igmp]
user@host# set interface ge-0/1/1.0 promiscuous-mode
2. Verify the configuration by checking the Promiscuous Mode field in the output of the
show igmp interface command.
3. Verify the operation of the filter by checking the Rx non-local field in the output of the
show igmp statistics command.
Related
Documentation
Understanding IGMP on page 445•
• Configuring the Loopback Interface on page 101 in the Junos OS Network Interfaces
Library for Routing Devices
• show igmp interface
• show igmp statistics
Modifying the IGMP Last-Member Query Interval
The last-member query interval is the maximum amount of time between group-specific
query messages, including those sent in response to leave-group messages. You can
configure this interval to change the amount of time it takes a routing device to detect
the loss of the last member of a group.
When the routing device that is serving as the querier receives a leave-group message
from a host, the routing device sends multiple group-specific queries to the group being
left. The querier sends a specific number of these queries at a specific interval. The number
of queries sent is called the last-member query count. The interval at which the queries
are sent is called the last-member query interval. Because both settings are configurable,
you can adjust the leave latency. The IGMP leave latency is the time between a request
to leave a multicast group and the receipt of the last byte of data for the multicast group.
The last-member query count x (times) the last-member query interval = (equals) the
amount of time it takes a routing device to determine that the last member of a group
has left the group and to stop forwarding group traffic.
The default last-member query interval is 1 second. 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.
455Copyright © 2017, Juniper Networks, Inc.
Chapter 14: Configuring Internet Group Management Protocol
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