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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
5. Click APPLY to send the updated configuration to the switch.Configuration changes take place immediately.The following table describes the read-only MST port configuration information displayed on the CST Configuration screen.

Table 17. MST port configuration information.

Field Description
Auto-calculated Port Path
Cost
Displays that the path cost is not automatically calculated (Disabled). Path
cost is recalculated based on the link speed of the port if the configured
value for Port Path Cost is 0.
Port ID The port identifier for the specified port within the selected MST instance. It
is made up from the port priority and the interface number of the port.
Port Mode Spanning Tree Protocol Administrative Mode associated with the port or port
channel. Possible values are Enable and Disable.
Port Forwarding State Indicates the current STP state of a port. If enabled, the port state
determines what forwarding action is taken on traffic. Possible port states
are:
•Disabled. STP is disabled on the port. The port forwards traffic while
learning MAC addresses.
•Blocking. The port is blocked and cannot be used to forward traffic or
learn MAC addresses.
•Listening. The port is in the listening mode. The port cannot forward
traffic or learn MAC addresses.
•Learning. The port is in the learning mode. The port cannot forward
traffic, however, it can learn new MAC addresses.
•Forwarding. The port is in the forwarding mode. The port can forward
traffic and learn new MAC addresses
Port Role Each MST bridge port that is enabled is assigned a port role for each
spanning tree. The port role is one of the following values: Root, Designated,
Alternate, Backup, Master, or Disabled.
Designated Root Root bridge for the selected MST instance. It is made up using the bridge
priority and the base MAC address of the bridge.
Designated Cost Displays cost of the port participating in the STP topology. Ports with a lower
cost are less likely to be blocked if STP detects loops.
Designated Bridge Bridge identifier of the bridge with the designated port. It is made up using
the bridge priority and the base MAC address of the bridge.
Designated Port Port identifier on the designated bridge that offers the lowest cost to the LAN.
It is made up from the port priority and the interface number of the port.