D-Link DWS-4026 User Manual page 256

D-Link Unified Access System
Table 154: Spanning Tree MST Port Configuration/Status Fields (Cont.)
Field
Port Up Time Since Counters
Last Cleared
Port Mode
Port Forwarding State
Port Role
Designated Root
Designated Cost
Designated Bridge
Designated Port
Loop Inconsistent State
Transitions Into Loop
Inconsistent State
Transitions Out Of Loop
Inconsistent State
• If you make any configuration changes, click Submit to apply the new settings to the switch.
• Click Refresh to update the screen with most recent data.
Page 256 Configuring Spanning Tree Protocol
Description
Time since the counters were last cleared, displayed in Days, Hours, Minutes, and
Seconds.
Shows whether STP is enabled on the port. To enable STP on a port, use the
System > Port > Configuration page.
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
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.
Root Bridge for the selected MST instance. It is made up using the bridge priority and
the base MAC address of the bridge.
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.
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.
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.
This parameter identifies whether the port is in a loop inconsistent state in the specified
MST instance. If the port is in a loop inconsistent state, it does not forward packets.
Shows the number of times this interface has gone into a loop inconsistent state.
Shows the number of times this interface has gotten out of a loop inconsistent state.
Software User Manual
Document 34CSFP6XXUWS-SWUM100-D7
12/10/09