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Community Member

NTP Issue on cisco 3560 switch

Hi all 

 

Here is my ntp configuration 

****************************

clock timezone GMT 4
clock summer-time UAE recurring

 

ntp server 192.168.10.254 version 2 prefer
end

 

************************************

sh ntp status 

Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 119.2092 Hz, actual freq is 119.2092 Hz, precision is 2**17
reference time is 00000000.00000000 (04:00:00.000 GMT Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec

-SW1#sh ntp associations

      address         ref clock     st  when  poll reach  delay  offset    disp
 ~192.168.10.254   0.0.0.0          16     -    64    0     0.0    0.00  16000.
 * master (synced), # master (unsynced), + selected, - candidate, ~ configured
-SW1#

 

 

Please help me what i have did wrong 

 

regards

raja

 

 

6 REPLIES
Hall of Fame Super Gold

Let's go with the basic.  

Let's go with the basic.  

 

First, 192.168.10.254, is this a synchronized NTP/SNTP source?  

Next, NTP version 2, would it make a difference?

Community Member

HI  My switch ip is 192.168

HI 

 

My switch ip is 192.168.10.254  i need to make that as my ntp server  for all my network devices 

 

Please can you give the configuration 

VIP Purple

Hello Is that device setup as

Hello

 

Is that device setup as a ntp master?

example:

NTP Master:

conf t
ntp master 12
ntp master
ntp max-associations xx
clock update-calendar
clock read-calendar

ntp authenticate
ntp authentication-key 931 md5 ntppassword
ntp trusted-key 931

 

NTP clients
--------------

conf t
ntp peer
ntp server 192.168.10.254 prefer

ntp authenticate
ntp authentication-key 931 md5 ntppassword
ntp trusted-key 931

 

res

Paul

Please don't forget to rate any posts that have been helpful. Thanks.
Hall of Fame Super Gold

You're still not answering

You're still not answering the question:  Is the appliance, with IP Address 192.168.0.254, synchronized with a valid SNTP/NTP address or not. 

 

If the answer is no, then NTP to the downstream device will be "quasi" or not-really-trusted.  

Community Member

Hi leo  I need to make the

Hi leo 

 

I need to make the switch 192.168.10.254  as ntp server 

Hall of Fame Super Gold

You are still not answering

You are still not answering the question.  

 

Is the appliance, with IP Address 192.168.10.254, synchronized with a valid SNTP/NTP address or not. 

 

Even if you enable NTP Master (which I personally don't recommend) and your appliance is NOT synchronized to a valid NTP source, then the appliance 192.168.10.254 can potentially broadcast the WRONG time to all the appliance.  Since you've forced all downstream appliances to synchronize with a source that has the wrong NTP data (using the command "ntp master") all your network equipment will be sporting the wrong time.

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