Ran into this bug today. Went to a pair of Nexus 5500s to debug a vPC link and noticed the timestamps were off. I thought that was odd. I tried show ntp peer-status and received no output in return, which I thought was even more odd. I poked at NTP for a while and decided it had to be a bug. I found the bug in the release notes and it was fixed in 5.2(1)N1(6). Here’s the Cisco bug report:
Symptom:
Nexus 5k acting as an NTP Client can’t sync with any NTP server(s).
when issuing a “show ntp peer-status” or a “show ntp peers” it does not display any of the servers/peers configured.
Conditions:
Nexus 5500/5000 running 5.2(1)N1(5).
Workaround:
Proactive workaround to prevent from this issue is none.
Reactive workaround to recover this issue is below. However, after reloading system, same issue may happen again.
#conf t
#clock protocol none
#clock protocol ntp
#copy run start
Fun. At least it can be fixed without reloading, which is a good thing in a data center switch.
FIN
Hi Scott,
I’ve got a newbie question. Where do you go to check for NX-OS bugs? Is there a search service at the cisco site?
thank you
The easiest way to look at the release notes. It will list open caveats (known, but not fixed bugs) and resolved caveats (fixed bugs).
If you have a SMARTnet account, you can do a deeper dive for bugs in Cisco Bug Search (https://tools.cisco.com/bugsearch/).
Wow. I was really pulling my hair out over that one. Thanks!
This bug is still present in version 7.1(0)N1(1b) on Nexus 5K