Reference Guide

Parameters
threshold number Enter the keyword threshold with the maximum number
of times a MAC-address station move is detected within the
configured interval. The range is from 5 to 50.
interval seconds Enter the keyword interval with the interval (in seconds).
The range is from 1 to 60.
Defaults Not configured.
Command Modes CONFIGURATION
Command History
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C1048P.
Usage Information
Because xSTP protocols are not supported on PEs, use this command to detect
possible loops on PE ports.
If a station move for a MAC address is detected above the configured threshold
and within the specified time, a syslog message is triggered with the port
information. All ports on which the station move was detected are shut down,
except for the port with the lowest interface index. Only the port with the lowest
ifIndex remains active. For example:
Jun 18 09:55:35: %RPM0-P:RP %MACMGR-1-PE LOOP DETECTION: Loop
occurred on PE interfaces:oldInterface: peGigE 0/2/47,
newInterface: peGigE 0/1/20,vlanId: 3902, macAddr: 00:aa:
00:00:00:
To display the PE ports that are shut down due to loop detection, enter the show
mac learning-limit violate-action command.
Dell# show mac learning-limit violate-action
Interface Violation-Type Violate-Action Status
PeGi 0/2/47 Pe-Loop Shutdown PEloop-disable
PeGi 100/0/20 Pe-Loop Shutdown PEloop-disable
PeGi 255/0/47 Pe-Loop Shutdown PEloop-disable
Po 1 Pe-Loop Shutdown PEloop-disable
Po 100 Pe-Loop Shutdown PEloop-disable
To display the reason why the line protocol is down on a PE port or port channel,
enter the show interface command.
Dell(conf-if-po-1)#do show interface port-channel 1
Port-channel 1 is up, line protocol is down(Pe Loop Detection)
When a PE interface is shut down due to a PE loop violation, you must manually
reset it. To reset the interface, shut it down by entering the shutdown command
and then re-enable it by entering the
no shutdown command.
Layer 2
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