Reference Guide

E-Series ExaScale Debugging and Diagnostics | 1109
In the example below, the manual loopback test is successful, and no SFM failure is detected.
FTOS#diag sfm all-loopback
Proceed with dataplane loopback test [confirm yes/no]:yes
SFM loopback test completed successfully.
FTOS#
If the test passes when the switch fabric is down and there are at least (max-1) SFMs in the chassis, then
the system will bring the switch fabric back up automatically. Like the runtime loopback test, the manual
loopback test failure will not bring the switch fabric down.
Power On/Off the SFM
If you suspect that an SFM is faulty and would like to manually disable it to determine whether any packet
loss or forwarding issues are resolved, execute the following command.
When there are a full set of SFMs online, powering down one SFM will reduce the total bandwidth
supported by the chassis, and may affect data flow. A warning message is issued at the command line that
requires user confirmation to proceed with the command.
FTOS#power-off sfm 0
SFM0 is active. Powering it off it might impact the data traffic.
Proceed with power-off [confirm yes/no]:yes
Feb 15 23:52:53: %RPM1-P:CP %CHMGR-2-MINOR_SFM: Minor alarm: only eight working SFM
FTOS#
Since this command is for diagnostic purposes, you can power off more than one SFM which may cause a
switch fabric module to go down. A warning message is issued at the command line and requires user
confirmation to proceed with the command.
FTOS#power-off sfm 1
WARNING!! SFM1 is active. Powering it off it will cause Switch Fabric to go down!!
Note: The dataplane runtime loopback configuration does not apply to this manual loopback test.
Note: Line card-SFM loopback test failure, during the manual test, will trigger an SFM walk.
Task Command Mode
Power on or off a specific SFM.
power-{off | on} sfm slot-number
EXEC Privilege
Note: Execute this command only during an offline diagnostics; this command may bring down the switch
fabric.