D-Link DWS-4026 Product Manual - Page 256

D-Link Unified Access System Software User Manual 12/10/09 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 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. • 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 Document 34CSFP6XXUWS-SWUM100-D7