Setting the Aging Time of Group Member Ports
Context
When the member port receives a Report message from a downstream host, the switch sets the aging time to: Robustness variable x General Query interval + Maximum response time for General Query messages.
If the member port receives a Done message from a downstream host, the switch sets the aging time to: Last member query interval x Robustness variable.
When deploying a Layer 2 multicast network, ensure that all Layer 2 multicast devices use the same parameter values to calculate the aging time of dynamic group member ports. In particular, ensure that the MLD snooping general query interval is consistent. Varying parameters will result in errors in Layer 2 multicast forwarding.
Procedure
- Run system-view
The system view is displayed.
- Run vlan vlan-id
The VLAN view is displayed.
- Run mld-snooping query-interval query-interval
The MLD snooping general query interval is configured.
By default, the MLD snooping general query interval is 125 seconds.
The default general query interval defined in RFC documents is 125 seconds, but some vendors define their own default general query intervals. It is recommended that all devices on a multicast network use the same general query intervals (including MLD and MLD snooping general query intervals).
- Run mld-snooping robust-count robust-count
The MLD snooping robustness variable is configured.
By default, the MLD snooping robustness variable is 2.
- Run mld-snooping max-response-time max-response-time
The MLD snooping maximum response time is set.
By default, the MLD snooping maximum response time is 10 seconds.
- Run mld-snooping last-listener-query-interval query-interval
The MLD snooping last member query interval is configured.
By default, the MLD snooping last member query interval is 1 second.
