Configuration: Loop Guard
Overview
This section provides information for Loop Guard in Configuration.
This chapter shows you how to configure the Switch to guard against loops on the edge of your network.
Loop Guard
Loop guard allows you to configure the Switch to shut down a port if it detects that packets sent out on that port loop back to the Switch. While you can use Spanning Tree Protocol (STP) to prevent loops in the core of your network. STP cannot prevent loops that occur on the edge of your network.
Global Settings
Use this screen to configure the global Loop Guard. Click Configuration > Loop Guard.
The following table describes the labels in this screen.
Configuration > Loop Guard > Global 
Label
Description
Global
State
Select Enable to activate loop protection on this Switch.
Recovery Time
Enter the period (in seconds) for which a port will be kept disabled in the event of a loop is detected (and the port action shuts down the port).
Apply
Click Apply to save the changes.
Cancel
Click Cancel to discard the changes.
Loop Guard Port
Use this screen to view the port’s Loop Guard settings. Click Configuration > Loop Guard > Port.
The following table describes the labels in this screen.
Configuration > Loop Guard > Port 
Label
Description
Port
Port
Displays the port index number.
State
Displays whether the loop guard feature is Enable or Disable on the port.
Action
Displays the action to take by the Switch. The options are Log, Shutdown Port, and Shutdown and Log.
Edit
Select this checkbox to configure the properties of a port. Click the Edit button change the properties of the port.
Cancel
Click Cancel to discard the changes.
Port Edit
Use this screen to configure Loop Guard settings on a port. Click Configuration > Loop Guard > Port > Edit.
The following table describes the labels in this screen.
Configuration > Loop Guard > Port > Edit 
Label
Description
Port
Port List
Displays the list of port index numbers to be configured.
State
Select to enable or disable the loop guard feature on the port.
Action
Select to have the Switch shut down a port and/or generate a log message if it detects that packets sent out on that port loop back to the Switch.
Apply
Click Apply to save the changes.
Cancel
Click Cancel to discard the changes.