Setting the clock on a Nexus 5k.

I noticed that you may not initially be able to set the clock time and date on Nexus 5Ks. For example:

SWITCH-5K2# sh clock
18:16:56.460 UTC Fri Jun 12 2009
SWITCH-5K2# clock set 13:21:00 13 feb 2014
Setting clock from CLI is not allowed in this VDC.
SWITCH-5K2# 

However, the clock set command worked fine on my Nexus 7Ks. After a bit of digging, I found that this is a known big in NX-OS 5.2(1) on Nexus 5Ks: https://tools.cisco.com/bugsearch/bug/CSCub52048/?referring_site=ss

I also noticed that I had an impacted version of the NX-OS:

SWITCH-5K2# sh ver | i system:
  system:    version 5.2(1)N1(1b)
SWITCH-5K2# 

There are a couple of work-arounds:

a) You can set the clock protocol to none in configuration mode, and then set the clock and time.

SWITCH-5K2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SWITCH-5K2(config)# clock prot none
SWITCH-5K2(config)# clock set 13:23:00 13 feb 2014
Thu Feb 13 13:23:00 UTC 2014
SWITCH-5K2(config)# sh clock 
13:23:11.122 UTC Thu Feb 13 2014
SWITCH-5K2(config)# 

b) You could also use NTP (or PTP) to set the clock and date.

SWITCH-5K2(config)# clock prot ntp 
SWITCH-5K2(config)# sh cloc 
13:23:31.519 UTC Thu Feb 13 2014 
SWITCH-5K2(config)# sh run | i ntp 
SWITCH-5K2(config)# 
SWITCH-5K2(config)# ntp server 172.16.3.4 use-vrf management 
SWITCH-5K2(config)# ! my NTP server is reachable from the management port 
. . .
! wait awhile for NTP to synch with the server (also for me to eat lunch)
SWITCH-5K2#  
SWITCH-5K2# sh clock 
14:34:43.470 UTC Thu Feb 13 2014 
SWITCH-5K2# sh ntp statistic loc
system uptime:          8017
time since reset:       8017
old version packets:    482
new version packets:    0
unknown version number: 0
bad packet format:      0
packets processed:      482
bad authentication:     0
SWITCH-5K2# sh ntp peer-status
Total peers : 1
* - selected for sync, + -  peer mode(active), 
- - peer mode(passive), = - polled in client mode 
    remote               local                 st   poll   reach delay
------------------------------------------------------------------------
*172.16.3.4             0.0.0.0                 2   64     377   0.00189 
SWITCH-5K2# 

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