Allied Telesis AT-S106 - Manual (Page 158)

Chapter 13: Spanning Tree and Rapid Spanning Tree Protocols
158
This page displays the following information about the ports:
Port
Indicates ports 1 through 48 on the AT-GS950/48 switch. Use the All
row to apply the same settings for the STP Status, Priority, and Path
Cost fields to your switch.
Trunk
Indicates the trunk assignment of a port.
Link Status
Indicates if the port link status is active (Up) or inactive (Down).
Port State
Indicates one of the following port states:
ˆ Blocking— A blocking state does not allow network traffic to be
sent or received on a the port except for BPDU data. A port with a
higher path cost to the root bridge than another on the switch will
cause a switching loop and is placed in the blocking state by the
Spanning Tree algorithm. The port’s state may change to the
forwarding state if the other links in use fail and the Spanning Tree
algorithm determines the port may transition to the forwarding
state.
ˆ Listening— This state occurs on a port during the convergence
process. The port in the listening state processes BPDUs and
awaits new information that would cause the port to return to the
blocking state.
ˆ Learning— While the port does not yet forward frames (packets),
in this state the port does learn source addresses from frames
received and adds them to the filtering (switching) database.
ˆ Forwarding— A port that both receives and sends data. This
indicates normal operation. STP continues to monitor the port for
incoming BPDUs that indicate the port should return to the
blocking state to prevent a loop.
ˆ Disabled— This state is not strictly part of STP. However, a
network administrator can manually disable a port.
Role
Indicates one of the following port roles:
ˆ Disabled— The Disabled Port role is assigned if the port is not
operational or is excluded from the active topology by
management or it is a network access port (IEEE Std 802.1X) and
it is Unauthorized, or its Administrative Bridge Port state is
Disabled.
ˆ Root— If the least cost path to the root is through this port, then it
becomes the root port for this bridge.