Users Guide

0 1 absent NA NA
-- Fan Status --
Unit Bay TrayStatus Fan0 Speed Fan1 Speed
------------------------------------------------------------------------------------
0 0 up up 8888 up 9056
Speed in RPM
For more information about verifying the PE configuration, see Displaying PE Stack Information.
Resetting a Port Extender
To reload a PE, enter the reset command.
• reset pe pe-id stack-unit pe-stack-unit-id
EXEC Privilege
– pe-id is a port-extender ID number from 0 to 255.
– pe-stack-unit-id is a PE stack-unit ID number from 0 to 7.
Dell# reset pe 0 stack-unit 1
Preventing Loops on Port Extender Ports
You can specify the threshold value and a time interval for the maximum number of station moves to prevent loops on a port
extender (PE) port . When the number of station moves for a specified MAC address exceeds the configured threshold value in
the configured time, a loop is detected on the PE ports. You can configure the mac-address-table station-move
threshold number interval seconds command to bring down the line protocol on all active ports in the learned path,
except for the port with the lowest interface index (ifIndex) to prevent a possible loop.
To specify the threshold value and timer interval for the maximum number of station move
1 Enter Configuration mode.
CONFIGURATION mode
Dell(conf)# mac-address-table station-move threshold number interval seconds
• number is the threshold value. The range is from 5 to 50.
After you enter a threshold value, you can specify a time interval in seconds. The range is from 1 to 60 seconds.
Dell(conf)# mac-address-table station-move threshold 5 interval 30
NOTE: Dell Networking OS recommends that you use the command because xSTP protocols are not supported on PEs.
2 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:
3 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.
4 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
Port Extenders (PEs) 692