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Smart Managed Compact Switch
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PHOENIX CONTACT 8089_en_03
Bridge identifier
A switch ID consists of eight bytes as an unsigned integer value. When comparing two
switch IDs, the one with the lowest numeric value is of higher, i.e., “better”, priority.
The first two bytes contain the priority.
The last six bytes contain the MAC address and thus ensure the uniqueness of the switch
ID in the event of identical priority values.
The switch with the lowest numerical switch ID becomes the root. It is recommended that
the root port and alternate port are specified using the priority.
Port identifier
The port ID consists of four bits for the port priority and twelve bits for the port number. The
port ID is interpreted as an unsigned integer value. When comparing two port IDs, the one
with the lowest numeric value is of higher, i.e., “better”, priority.
Figure 5-6 “(R)STP Port Configuration” web page
Port number
Indicates the number of the port currently selected.