Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

N4K-4001i_%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED

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

Everyone's tags (2)
3 REPLIES
New Member

N4K-4001i_%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED

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.

New Member

N4K-4001i_%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED

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.

New Member

N4K-4001i_%SYSTEMHEALTH-4-OHMS_PORT_LOOPBACK_FAILED

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

1152
Views
0
Helpful
3
Replies
CreatePlease to create content