Stratum on NTP

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Nov 13th, 2009
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Hi, I have switch-A which is getting time from Switch-B. Switch-B is getting time from Global NTP. My requirement is, Sw-A should get time from B having Stratum- 8. Please help how it is possible.

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Istvan_Rabai Fri, 11/13/2009 - 02:49
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Hi Rupesh,

The "ntp master 7" command on Switch-B will set its stratum number to 7, then Switch-A's stratum number will be 8.



Rupesh Kashyap Fri, 11/13/2009 - 02:51
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But, Sw-B is not master, as it is taking time from Other global NTP server. pls suggest as Sw-B is client ot gloabl NTP server.

francisco_1 Fri, 11/13/2009 - 02:54
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according to cisco use the "ntp master (statum)" this command with extreme caution. It is very easy to override valid time sources using this command, especially if a low stratum number is configured. Configuring multiple machines in the same network with the ntp master command can cause instability in timekeeping if the machines do not agree on the time.

francisco_1 Fri, 11/13/2009 - 02:56
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Rupesh, if switch A is getting ntp from switch B only then why changed the stratum?

Leo Laohoo Sun, 11/15/2009 - 18:01
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I would like to dissuade you from using the "NTP master" command. Can you post your NTP config? I am suspecting your question is not that complicated.


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