A 64-bit Bridge Identifier and its components: a manageable
priority in the four most-significant bits, a system ID extension in
the next 12 bits, and the Bridge Address in the remaining 48 bits.
bridge-port-parameters
rstp
This grouping comprises per-interface parameters.
port-id
port-id port-priority port-number
A 16-bit Port Identifier and its components: a priority in the four
most-significant bits, and a twelve-bit Bridge Port number.