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.
When the member port receives a Leave 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, especially the IGMP snooping general query interval. Otherwise, errors will occur in Layer 2 multicast forwarding.
Procedure
- Run system-view
The system view is displayed.
- Run vlan vlan-id
The VLAN view is displayed.
- Run igmp-snooping query-interval query-interval
The IGMP snooping general query interval is set.
By default, the IGMP 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 IGMP and IGMP snooping general query intervals). On Huawei fixed switches, the default value of the IGMP general query interval is 60 seconds, and the default value of the IGMP snooping general query interval is 125 seconds.
- Run igmp-snooping robust-count robust-count
The IGMP snooping robustness variable is set.
By default, the IGMP snooping robustness variable is 2.
- Run igmp-snooping max-response-time max-response-time
The IGMP snooping maximum response time is set.
By default, the IGMP snooping maximum response time is 10 seconds.
- Run igmp-snooping lastmember-queryinterval lastmember-queryinterval
The IGMP snooping last member query interval is set.
By default, the IGMP snooping last member query interval is 1 second.