Reference Guide

1108 | E-Series ExaScale Debugging and Diagnostics
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Like the line card to SFM results, line card S3 loopback tests results are displayed when you use the show
trace linecard command.
Messages appear indicating whether the test was successful or not (Message 4).
Figure 63-2. ExaScale line card TSF3 loopback test walkthrough
Manual loopback test
This manual dataplane loopback test is a supplemental test to the automatic runtime loopback test and can
be initiated regardless if the runtime loopback test is enabled or disabled. Use this test to verify that the
dataplane is actually functional even when a switch fabric status is down but there are at least (max-1)
SFMs in active or diag failure state.
If the 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.
Message 4 Line card S3 loopback test messages
[1/21 11:38:58] LCMGR-(lcMgr):LCCPU-S3 loopback test on PP 0 done, Result: Pass
[1/21 11:38:58] LCMGR-(lcMgr):LCCPU-S3 loopback test on PP 1 done, Result: Pass
Note: Disabling the runtime loopback test prevents the sfm-walk command and sfm-bringdown
commands from taking effect.
Task Command Mode
Execute a manual dataplane loopback test:
• all-loopback – dataplane loopback test on all line cards
This test can be run when the switch fabric is in either an operational or
a non-operational state.
diag sfm [all-loopback]
EXEC Privilege
CAM
iFPTM
eFPTM
LC-Switch
P
I
C
CPU
T
S
F
3
Line card On-Board TSF3 Packet Walk
Line card CPU (LC-CPU) to
Line card switch to
iFPTM to
TSF3 to
eFPTM to
Linecard switch