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22 Configuring and Monitoring the Switch DNswitch 800
Ports
The parameters shown in the following figure and table are for port STA
Information (Port 1-8).
Figure 3-14. STA Information - Ports
Parameter Description
Port Status Displays the current state of this port within the spanning tree:
No Link There is no valid link on the port.
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.