Configuring Spanning Tree Protocol
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 253
D-Link UWS User Manual
Table 136: Spanning Tree MST Port Configuration/Status Fields
Field Description
MST ID Select an existing MST instance from drop-down list to display or configure its
values.
Interface Select a physical or port channel interface to configure. The port is associated
with the VLAN(s) associated with the MST.
Port Priority The priority for a particular port within the MST. The port priority is set in
multiples of 16. If you specify a value that is not a multiple of 16, the priority
is set to the priority is automatically set to the next lowest priority that is a
multiple of 16. For example, if you set a value between 0 and 15, the priority
is set to 0. If you specify a number between 16 and 31, the priority is set to 16.
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-calculate 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 CST. 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 Shows whether is enabled on the port. To enable on a port, use the
System > Port > Configuration page.
Port Forwarding State Indicates the current state of a port. If enabled, the port state determines
what forwarding action is taken on traffic. Possible port states are:
• Disabled: 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 topology. Ports with a lower cost
are less likely to be blocked if 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.
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