When a Layer 2 network topology changes, the forwarding path of multicast packets may change. When a fault occurs on a link, the switch sends IGMP Query messages and the multicast members reply with IGMP Report messages. The switch then updates information about multicast member ports based on the IGMP Report messages. In this way, multicast packets can be switched to new forwarding paths quickly.
The system view is displayed.
The switch is configured to send IGMP Query messages upon topology changes.
By default, the switch does not send IGMP Query messages upon topology changes.
This command enables the switch to send IGMP Query messages (the source IP address is 192.168.0.1 by default) upon topology changes, and update information about multicast member ports quickly, shortening the interruption of multicast packet forwarding to the downstream members.
The source IP address of IGMP Query messages is configured.
By default, the source IP address of IGMP Query messages sent upon topology changes is 192.168.0.1. If this IP address is used by another device on the network, use this command to set a different IP address.