(Rapid) Spanning Tree
7966_en_04
PHOENIX CONTACT
5-7
5.1.1.1
(R)STP Port Configuration
This page displays the valid (R)STP configuration settings for the selected port.
If termination devices or subnetworks are connected without RSTP or STP via a port, it is
recommended that the “Admin Edge Port” be set to “Edge Port”. A link modification at this
port will therefore not result in a topology modification.
5.1.1.2
Switch/port ID
The validity of switches and ports is determined according to priority vectors.
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.
Modifications of properties can result in complete reconfiguration of (Rapid) Spanning
Tree.
It is recommended that a suitable root switch and a backup root switch are specified using
corresponding priority assignment.