D-Link DES-6300 User Manual page 109

Modular L3 Ethernet Switch User's Guide
Figure 6- 74. Spanning Tree Port Table window
The Spanning Tree Port Table displays the following fields:
♦ Port – Indicates the port number to which the STP applies.
♦ Priority – Indicates the priority value of the port. The Priority value can be used to influence
the choice of port when a bridge has two ports connected in a loop.
♦ PortState – Indicates the current STP state of a port. If enabled Port State determines what
forwarding action is taken on traffic. If the bridge discovers a malfunctioning port, the port is
placed in the Broken State. The possible values are:
◊
Disabled – STP is currently disabled on the port. The port forwards traffic while
learning MAC addresses.
◊
Blocking – The port is currently blocked and cannot be used to forward traffic or
learn MAC addresses.
◊
Listening – The port is currently in the listening mode. The port cannot forward traffic
nor can it learn MAC addresses.
◊
Learning – The port is currently in the learning mode. The port cannot forward traffic
however it can learn new MAC addresses.
◊
Forwarding – The port is currently in the forwarding mode. The port can forward
traffic and learn new MAC addresses.
◊
Broken – The port is currently malfunctioning and cannot be used for forwarding
traffic.
♦ Port Enable – Indicates if the STP is enabled on the port. If the port is disabled, the PortState
is forwarding.
♦ Path Cost – The amount this port contributes to the Root Path Cost. The Path Cost can be
adjustable to a higher or lower value, and can be used to forward traffic towards or away from a
path being rerouted.
♦ Designated Root – The Designated Bridge transmits a unique Bridge Identifier as the root in
the CMs.
♦ Designated Cost – The Designated Port path cost of network segments connected to this port.
This value is compared to the Root Path Cost field in received CMs.
♦ Designated Bridge – Identifies which bridge is the designated bridge for the port.
♦ Port Designated Port – Identifies the port on the designated bridge.
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