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(Optional) Configuring a Static Router Port
Context
A router port is on a Layer 2 device and receives multicast protocol packets from an upstream Layer 3 multicast router or Layer 3 switch. The router port receives multicast packets from the upstream device and forwards them to member ports. After Multicast Listener Discovery (MLD) snooping is enabled in a VLAN, all interfaces in the VLAN learn the multicast packets by default. When an interface receives an MLD Query or PIM hello packet, the Layer 2 device sets the interface as a dynamic router port. A dynamic router port has the aging time.
To receive multicast packets from a certain interface stably in a long period, set the interface as a static router port. A static router port does not age. You can use the undo command to delete it.