DELL S50V User Manual

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E-Series TeraScale Debugging and Diagnostics

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If the RPM-SFM or line card-SFM loopback test detects an SFM failure, an attempt is made to isolate a 
single faulty SFM by automatically walking the SFMs. For this failure case, error messages similar to the 
runtime loopback test error are generated. 

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.

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.

Execute a manual dataplane 
loopback test:

•

all-loopback – Both the RPM 
and the line card dataplane 
loopback test is done.

•

rpm-loopback – Only the RPM 
dataplane loopback test is done.

This test can be run when the switch 
fabric is in either an operational or a 
non-operational state. 

[

]

EXEC

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.

Power on or off a specific SFM.

{

}

EXEC

FTOS#diag sfm all-loopback  

Proceed with dataplane loopback test [confirm yes/no]:yes

SFM loopback test completed successfully.

FTOS#