IBM Power Systems 775 Manual page 275

Issue the following lsnwlinkinfo command to help you identify and resolve a defective or
poorly seated fiber cable:
# lsnwlinkinfo
FR006-CG06-SN051-DR3-HB3-LR9 DOWN_FAULTY ExpNbr: FR006-CG04-SN051-DR1-HB1-LR11
ActualNbr: FR000-CG00-SN511-DR0-HB0-Lxx
Output from lsnwlinkinfo: The output from lsnwlinkinfo indicates that the expected
L-link connection between FR006-CG06-SN051-DR3-HB3-LR9 and
FR006-CG04-SN051-DR1-HB1-LR11 is missing. The generic ActualNbr value of
FR000-CG00-SN511-DR0-HB0-Lxx implies that the fiber cable between the specified link
ports is missing, improperly seated, or defective.
Complete the following steps to use the nwlinkdiag command to identify the cause of the
problem:
1. Remove the cable from L-link port FR006-CG06-SN051-DR3-HB3-LR9. If the cable is
missing or not properly seated, this condition is likely the cause of the problem.
2. Install a wrap device in L-link port FR006-CG06-SN051-DR3-HB3-LR9.
3. Issue the nwlinkdiag -s 51 -d 3 -m 3 -lr 9 command.
The command results show that the FR006-CG06-SN051-DR3-HB3-LR9
LOCATION_CODE: U78A9.001.9920389-P1-T9 link is operational.
4. Remove the wrap device and reinstall the cable at FR006-CG06-SN051-DR3-HB3-LR9.
5. Remove the cable from L-link port FR006-CG04-SN051-DR1-HB1-LR11. If the cable is
missing or not properly seated, this condition is likely the cause of the problem.
6. Install a wrap device in L-Link port FR006-CG04-SN051-DR1-HB1-LR11.
7. Issue the nwlinkdiag -s 51 -d 1 -m 1 -lr 11 command.
The command results show that the FR006-CG04-SN051-DR1-HB1-D11
LOCATION_CODE: U78A9.001.9920137-P1-T9 link is operational.
8. Remove the wrap device and reinstall the cable at FR006-CG04-SN051-DR1-HB1-D11.
9. Because the wrap test passed on both ports, the problem is most likely a missing, poorly
seated, or defective cable.
10.Rerun lsnwlinkinfo to confirm whether an issue with the original suspect L-link
connection is still indicated. If the suspect link is still identified, replace the L-link cable
between FR006-CG06-SN051-DR3-HB3-LR9 and FR006-CG04-SN051-DR1-HB1-LR11.
If the suspect link is no longer identified, the problem was a disconnected or poorly seated
cable.
11.After the cable issue is resolved, rerun lsnwmiswire to ensure that the suspect link is no
longer reported as DOWN_FAULTY.
Wrap tests: If one of these wrap tests fails to indicate a hardware issue with the optical
L-link port, the nwlinkdiag command returns the following message:
FR006-CG06-SN051-DR3-HB3-LR9
This message indicates that the link is not operational. If a cable is installed in the optical
port, remove the cable, install an optical wrap device, and reissue the nwlinkdiag
command. If a wrap device already is installed, then the problem is behind the optical port.
LOCATION_CODE: U78A9.001.9920389-P1-T9
Chapter 4. Troubleshooting problems
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