Chapter 27 Loop Guard
ES3500 Series User’s Guide
236
Note: After resolving the loop problem on your network you can re-activate the disabled
port via the web configurator (see Section 8.7 on page 93) or via commands (see
the Ethernet Switch CLI Reference Guide).
27.2 Loop Guard Setup
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.
Figure 133 Advanced Application > Loop Guard
The following table describes the labels in this screen.
Table 93 Advanced Application > Loop Guard
LABEL DESCRIPTION
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.
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