D-Link DWS-4026 Product Manual - Page 254

D-Link Unified Access System Software User Manual 12/10/09 Table 153: Spanning Tree CST Port Configuration/Status Fields (Cont.) Field Port Role Designated Root Designated Cost Designated Bridge Designated Port Topology Change Acknowledge Auto Edge Edge Port Point-to-point MAC Root Guard Loop Guard TCN Guard CST Regional Root CST Path Cost Loop Inconsistent State Transitions Into Loop Inconsistent State Transitions Out Of Loop Inconsistent State Description 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 CST. 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. Identifies whether the next BPDU to be transmitted for this port would have the topology change acknowledgement flag set. It is either "True" or "False". Configuring the auto edge mode of a port allows the port to become an edge port if it does not see BPDUs for some duration. The possible values are Enable or Disable. Indicates whether the port is enabled as an edge port. Derived value of the point-to-point status. Configuring the root guard mode sets a port to discard any superior information received by the port and thus protect against root of the device from changing. The port gets put into discarding state and does not forward any packets.The possible values are Enable or Disable. Configuring the loop guard mode prevents a port from erroneously transitioning from blocking state to forwarding when the port stops receiving BPDUs. The port is marked as being in loop-inconsistent state. In this state, the port does not forward packets. The possible values are Enable or Disable. Configuring the TCN guard for a port restricts the port from propagating any topology change information received through that port.The possible values are Enable or Disable. Shows the priority and base MAC address of the CST Regional Root. Shows the path Cost to the CST tree Regional Root. Identifies whether the port is currently in a loop inconsistent state. If the port is in a loop inconsistent state, it does not forward packets. Shows the number of times this interface has moved 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 Force to force the port to send out 802.1w or 802.1D BPDUs. • Click Refresh to update the screen with most recent data. MST PORT CONFIGURATION/STATUS Use the Spanning Tree MST Port Configuration/Status page to configure Multiple Spanning Tree (MST) on a specific port on the switch. Page 254 Configuring Spanning Tree Protocol Document 34CSFP6XXUWS-SWUM100-D7