N4K-4001i_%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED

[Nick Chen]

Dear All,

I met a problem in N4K-4001i. But I can't find any explaination on below log.

Symptom: all blade server lost connection to uplink switch.

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 1, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 2, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 3, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 4, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 5, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 6, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 7, has failed loopback test. 

%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED: Port 16, has failed loopback test.

Best Regards,

Nick

[krunal_shah]

There must be port loopback test failed on those ports. You can display results via show system health module # command. There are other show logging onboard exception-log command to see more detail

http://www.cisco.com/en/US/docs/switches/datacenter/nexus4000/nexus4000_i/sw/configuration/guide/rel_4_1_2_E1_1/sm_ohms.html

It is most likely a hardware problem. Try reseating the switch module in bladecenter bay If does not solve problem you need a CRU.

[gustavo]

Dear Nick,

How did you solve your problem? It was a hardware or software (a NX-OS bug) problem?

I´m with the same situation, I have a N4K-4001I-XPX with NX-OS 4.1.2.E1.1f and the log is the same, not for all ports at same time, but when a loopback test fail for at least one port, all blade servers lost the connection accross the etherchannel. The other port menbers of etherchannel remain with the up status.

[Nick Chen]

Thanks Krunal, we replaced the switch and upgrade NX-OS to 1g and it's normal till now.