GS700TR Smart Switch Software Administration Manual
Configuring Switching Information 3-31
v1.0, May, 2008
Port Path Cost Set the Path Cost to a new value for the specified port in the selected
MST instance. It takes a value in the range of 1 to 200000000.
Auto-calculated Port Path
Cost
Displays whether the path cost is automatically calculated (Enabled) or
not (Disabled). Path cost is calculated based on the link speed of the
port if the configured value for Port Path Cost is zero.
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 Up Time Since
Counters Last Cleared
Time since the counters were last cleared, displayed in Days, Hours,
Minutes, and Seconds.
Port Mode Spanning Tree Protocol Administrative Mode associated with the port
or port channel. Possible values are Enable or 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 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
Port Role Each MST Bridge Port that is enabled is assigned a Port Role for each
spanning tree. The port role will be one of the following values: Root
Port, Designated Port, Alternate Port, Backup Port, Master Port or
Disabled Port.
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.
Table 3-20. Spanning Tree MST Port Status Fields (continued)
Field Description