You can change the priority of BFD packets to implement the following functions:
Detect whether packets with different priorities on a link can be forwarded.
Ensure that BFD packets with a higher priority are forwarded first.
The system view is displayed.
The BFD session view is displayed.
The priority of BFD packets is set.
By default, the priority of BFD packets is 7, representing the highest priority. The value 0 is the lowest priority.