Precautions for the configuration of multicast BFD sessions on S series switches

For S series switches, the packets sent by multicast BFD are untagged.
When a BFD interface receives a tagged BFD packet, the BFD module checks whether the VLAN ID of the BFD packet is the same as the default VLAN ID on the interface. If not, the BFD module discards the packet.
To configure multicast BFD on an interface, run the port default vlan command to specify the default VLAN of the interface.

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