A router port sends IGMP Report/Leave messages to an upstream Layer 3 device and receives multicast packets from the upstream device. When IGMP snooping is enabled on a device, the device can learn entries of the dynamic router port to monitor the sending of multicast data. When network congestion or flapping occurs, the dynamic router port does not receive General IGMP Query or Protocol Independent Multicast (PIM) Hello messages before it times out. The switch deletes the interface from the router port list, which will cause service interruption. To avoid service interruption, set a longer aging time.
The system view is displayed.
The VLAN view is displayed.
The aging time is set for dynamic router ports.
By default, the aging time of router ports that the switch learns from General IGMP Query messages is 180 seconds, and the aging time of router ports that the switch learns from PIM Hello messages is the Holdtime value in PIM Hello messages.