Allied Telesis AT-GS950/16PS, Руководство пользователя

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Chapter 4: STP and RSTP
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This page displays the following information about the ports:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
You can select the All row to apply the same setting to all ports of
your switch for the AdminOperEdge , Admin/OperPtoP , and
Migration fields.
Trunk - Indicates the trunk assignment of a port.
Link - Indicates that the port’s link is active (Up) or inactive
(Down).
State - Indicates one of the following port states:
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
causes 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.
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.
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.
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.
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:
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.
Root - If the least cost path to the root is through this port, then
it becomes the root port for this bridge.
Designated - If this is the designated bridge for the LAN and if