IBM Power Systems 775 Manual

Contents

Chapter 4. Troubleshooting problems 261Issue the following lsnwlinkinfo command to help you identify and resolve a defective orpoorly seated fiber cable:# lsnwlinkinfoFR006-CG06-SN051-DR3-HB3-LR9 DOWN_FAULTY ExpNbr: FR006-CG04-SN051-DR1-HB1-LR11ActualNbr: FR000-CG00-SN511-DR0-HB0-LxxComplete the following steps to use the nwlinkdiag command to identify the cause of theproblem:1. Remove the cable from L-link port FR006-CG06-SN051-DR3-HB3-LR9. If the cable ismissing 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-LR9LOCATION_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 ismissing 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-D11LOCATION_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, poorlyseated, or defective cable.10.Rerun lsnwlinkinfo to confirm whether an issue with the original suspect L-linkconnection is still indicated. If the suspect link is still identified, replace the L-link cablebetween 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 seatedcable.11.After the cable issue is resolved, rerun lsnwmiswire to ensure that the suspect link is nolonger reported as DOWN_FAULTY.Output from lsnwlinkinfo: The output from lsnwlinkinfo indicates that the expectedL-link connection between FR006-CG06-SN051-DR3-HB3-LR9 andFR006-CG04-SN051-DR1-HB1-LR11 is missing. The generic ActualNbr value ofFR000-CG00-SN511-DR0-HB0-Lxx implies that the fiber cable between the specified linkports is missing, improperly seated, or defective.Wrap tests: If one of these wrap tests fails to indicate a hardware issue with the opticalL-link port, the nwlinkdiag command returns the following message:FR006-CG06-SN051-DR3-HB3-LR9 LOCATION_CODE: U78A9.001.9920389-P1-T9This message indicates that the link is not operational. If a cable is installed in the opticalport, remove the cable, install an optical wrap device, and reissue the nwlinkdiagcommand. If a wrap device already is installed, then the problem is behind the optical port.