ZyXEL Communications MES3500-24F User Manual

 Chapter 27 Loop Guard

MES3500-24/24F User’s Guide

Note: After resolving the loop problem on your network you can re-activate the disabled 

port via the web configurator (see 

) or via commands (see 

the Ethernet Switch CLI Reference Guide).

Click Advanced Application > Loop Guard in the navigation panel to display the screen as 
shown. 

Note: The loop guard feature can not be enabled on the ports that have Spanning Tree 

Protocol (RSTP, MRSTP or MSTP) enabled.

Advanced Application > Loop Guard

The following table describes the labels in this screen. 

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.