Nexus 9K ports stop working...Randomly

SysAdmin
SysAdmin used Ask the Experts™
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I have two Cisco Nexus 9K's at my core layer both with 96 copper and then some fiber modules.

I'm having a weird issue where random copper ports just stop working. Issuing a shut / no shut doesn't help. Because I can't always reboot the core I will just move it to another port. But whenever I do get a chance to reboot, the ports will work again.

These ports have a very simple config: switchport mode access; switchport access vlan X and a description. I am not running STP on these ports.

Anyone see this before? Any insight is much appreciated.

Thanks in advance.
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SouljaSr.Net.Eng
Top Expert 2011

Commented:
I haven't seen this before. What is connected to the ports that stop randomly?  When you move to another port it start's working again? What do your logs show? On the ports that stop working what does the port statistics show?

Author

Commented:
It has been random devices like a camera server or a caching server that stop working. Yes, when I move to another port immediately starts working. Upon rebooting the core the ports that stopped working, work again! But rebooting is not something I do very often.

I was troubleshooting non-related issue earlier and ran a clear counters on switch so I may not have accurate interface details on the non-working port.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
Outside of checking port stats, it doesn't sound like a cabling issue since it happens to random ports. I have not seen anything like this on my 9k's. I would open a TAC case to see if this is a possible bug.  What version are you running. I am running NXOS: version 7.0(3)I4(7) on Nexus 9372's.
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Author

Commented:
I have even tested cables using flukes.

I too have same Nexus 9372 series running NXOS: version 7.0(3)I2(1a)

I will have to open a TAC to see if they know of anything.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
That's your best route for an anomaly like this.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
Update the thread with what they find. Thanks!

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