Allied Telesis AT-S29 - Manual (Page 91)

AT-S29 Management Software User’s Guide
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Parameter Description
Port Status Displays the current state of this port within the
spanning tree:
❑ Disabled: Port has been disabled by the user or has failed
diagnostics.
❑ Blocked: Port receives STA configuration messages, but does not
forward packets.
❑ Listening: Port will leave blocking state due to topology change,
starts transmitting configuration messages, but does not yet forward
packets.
❑ Learning: Has transmitted configuration messages for an interval set
by the Forward Delay parameter without receiving contradictory
information. Port address table is cleared, and the port begins
learning addresses.
Forwarding: The port forwards packets, and continues learning addresses.
The rules defining port status are:
❑ A port on a network segment with no other STA compliant bridging
device is always forwarding.
❑ If two ports of a switch are connected to the same segment and there
is no other STA device attached to this segment, the port with the
smaller ID forwards packets and the other is blocked.
❑ All ports are blocked when the switch is booted, then some of them
change state to listening, to learning, and then to forwarding.
Forward
Transitions The number of times the port has changed status to forwarding state.
Designated Cost The cost for a packet to travel from this port to the root in the current
spanning tree configuration. The slower the media, the higher the cost.
Designated Bridge The priority and MAC address of the device through which this port must
communicate to reach the root of the spanning tree.
Designated Port The port on the designated bridging device through which this switch
must communicate with the root of the spanning tree.