User manual

Rapid Spanning Tree
7278_en_01 PHOENIX CONTACT 4-5
Oper Edge Port
All ports that do not receive any RSTP BPDUs become edge ports, i.e., ports that switch
to the "Forwarding" state immediately after restart.
RSTP State
Indicates the current RSTP state of the relevant port.
Possible states:
– "Forwarding"
The port is integrated in the active topology and forwards data.
– "Discarding"
The port does not take part in data transmission.
– "Learning"
The port does not take part in data transmission of the active topology, however, MAC
addresses are learned.
4.2.1.2 RSTP Port Configuration
This page displays the valid RSTP configuration settings for the selected port.
If termination devices or subnets are connected without RSTP or STP via a port, it is
recommended to set the "Admin Edge Port" to "Edge Port". In this way, a link modification
at this port does not result in a topology modification.
4.2.1.3 Switch/Port ID
The validity of switches and ports is determined according to priority vectors.
Bridge Identifier
A switch ID consists of 8 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 6 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 4 bits for the port priority and 12 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.
Modifications of properties can result in complete reconfiguration of (Rapid) Spanning
Tree.