Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 1096

Use this command in Configuration Terminal Batch mode to detect the possible loops in a dual-homing setup. 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 learninglimit 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 Parameters mac learning-limit address_limit [vlan vlan-id] [station-move-violation [dynamic]] [dynamic [no-station-move| station-move]] address_limit vlan vlan-id dynamic station-moveviolation Enter the maximum number of MAC addresses that can be learned on the interface. The range is from 1 to 1000000. E-Series only: Enter the keyword then the VLAN ID. The range is from 1 to 4094. (OPTIONAL) Enter the keyword dynamic to allow aging of MACs even though a learning limit is configured. (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 Layer 2 1096