Users Guide

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.
mac learning-limit
Limit the maximum number of MAC addresses (static + dynamic) learned on a selected interface.
C9000 Series
Syntax
mac learning-limit address_limit [vlan vlan-id] [station-move-violation
[dynamic]] [dynamic [no-station-move| station-move]]
Parameters
address_limit Enter the maximum number of MAC addresses that can be learned on the
interface. The range is from 1 to 1000000.
vlan vlan-id E-Series only: Enter the keyword then the VLAN ID. The range is from 1 to 4094.
dynamic (OPTIONAL) Enter the keyword dynamic to allow aging of MACs even though a
learning limit is configured.
station-move-
violation
(OPTIONAL) Enter the keywords station-move to allow a station move on
learned MAC addresses.
Defaults
● On S-Series, the default behavior is dynamic.
NOTE: “Static” means manually entered addresses, which do not age.
Command Modes INTERFACE
Command
History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
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