Supported Platforms
Related Documentation
- EX, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- Modifying the IGMP Robustness Variable
- EX, J, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- show pim interfaces
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.
To modify this interval:
- Configure the time (in seconds) that the routing device
waits for a report in response to a group-specific query.[edit protocols igmp]user@host# set query-last-member-interval 0.1
- Verify the configuration by checking the IGMP Last Member Query Interval field in the output of the show igmp interfaces command.
 | Note: You can configure the last-member query count by configuring the robustness variable. The two are always equal. |
Related Documentation
- EX, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- Modifying the IGMP Robustness Variable
- EX, J, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- show pim interfaces
Published: 2014-07-23
Supported Platforms
Related Documentation
- EX, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- Modifying the IGMP Robustness Variable
- EX, J, M, MX, PTX, T Series, QFabric System, QFX Series standalone switches
- show pim interfaces
