Dell PowerConnect 6248 User's Guide - Page 347
values: Root Port, Designated Port, Alternate Port, Backup Port, Master Port or Disabled Port. - spanning tree root guard
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- 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. • STP Root Guard - Prevents the root of a Spanning Tree instance from changing unexpectedly. When a root bridge has root guard enabled and a superior BPDU arrives, that port is moved to a rootinconsistent state, which equates to the listening state. The root bridge is enforced. • Role - Displays the role this port has in the STP topology. The port role will be one of the following values: Root Port, Designated Port, Alternate Port, Backup Port, Master Port or Disabled Port. • Speed - Displays speed at which the port is operating. • Path Cost - Specifies the port contribution to the root path cost. The path cost is adjusted to a higher or lower value, and is used to forward traffic when a path is being rerouted. A value of zero means the path cost is set according to the port's speed. The possible values are 0 to 200000000. The default value is 0. • Priority - Specifies priority value of the port. The priority value influences the port choice when a bridge has two ports connected in a loop. The possible values are 0 to 240. The default value is 128. • External Path Cost - Specifies the External Path Cost to a new value for the specified port in the spanning tree. Enter 0 to set the external path cost value automatically on the basis of Link Speed. The possible values are 0 to 200000000. The default value is 0. • Loop Guard - 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. • TCN Guard - Enabling the TCN Guard feature restricts the port from propagating any topology change information received through that port. This means that even if a port receives a BPDU with the topology change flag set to true, the port will not flush its MAC address table and send out a BPDU with a topology change flag set to true. • Auto Edge - Enabling the Auto Edge feature allows the port to become an edge port if it does not see BPDUs for some duration. • Designated Bridge ID - Displays the ID of the designated bridge. • Designated Port ID- Displays the ID of the selected port. • 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. • LAG - Displays LAG to which the port is attached. Configuring Switching Information 347