ZyXEL Communications 4528F User Manual

Chapter 27 Loop Guard

XGS-4526/4528F/4728F User’s Guide

The following table describes the labels in this screen. 

Table 89   Advanced Application > Loop Guard 

Active

Select this option to enable loop guard on the Switch.

The Switch generates syslog, internal log messages as well as SNMP traps 
when it shuts down a port via the loop guard feature. 

Port

This field displays a port number. 

*

Use this row to make the setting the same for all ports. Use this row first 
and then make adjustments on a port-by-port basis. 

Note: Changes in this row are copied to all the ports as soon as you 

make them.

Active

Select this check box to enable the loop guard feature on this port. The 
Switch sends probe packets from this port to check if the Switch it is 
connected to is in loop state. If the Switch that this port is connected is in 
loop state the Switch will shut down this port. 

Clear this check box to disable the loop guard feature. 

Apply

Click Apply to save your changes to the Switch’s run-time memory. The 
Switch loses these changes if it is turned off or loses power, so use the 
Save link on the top navigation panel to save your changes to the non-
volatile memory when you are done configuring.

Cancel

Click Cancel to begin configuring this screen afresh.