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What is NTP peer dispersion?

port.islander
Beginner
Beginner

The official cert guide for the CCNP ENCOR exam states:

Root dispersion = the calculated error of the actual clock attached to the atomic clock

Peer dispersion = the root dispersion plus the estimated time to reach the root NTP server

 

Here is what confuses me:
In every example of show ntp status that I see, the peer dispersion is less than the root dispersion.
How can that be if it's the sum of the root dispersion and the latency to the NTP server?

1 Reply 1

Martin L
VIP Advisor VIP Advisor
VIP Advisor

 

I would check book errata for your book edition; maybe they made mistake and gave wrong example; also, look for other source of  definition and explanation.  I don't recall reading about ntp dispersion so not sure about definition.  anything in Cisco Doc pages that explains this better?

 

Regards, ML
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