Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

NTP peering

I have a truetime NTP server on the network and I point to it with several routers. When I do a show ntp associations detail and sh ntp status, I get stratum information indicating that the truetime is at stratum 1 and the router pointing to it is at stratum 2. If I set up several peers and make one of them preferred, how will another router be selected to provide NTP info to me? Will the best stratum get selected or will the preferred peer? How do the routers know what stratum they are at? If I create an NTP master, will that peer get selected over the preferred peer in the event that lower stratum routers are not available in the peer list? thx

  • Other Network Infrastructure Subjects

Re: NTP peering

Answers for your questions...

1. It always synchronizes with preferred server only, if it fails only another routers(peers) will be considered.

2. The PREFERRED peer always get selected over the best stratum server.

3. If the Router (NTP client) is polling a server of stratum N, the client will be stratum N+1 when it synched up. Otherwise, it will stay at stratum 16.

4. For final answer, I believe the answer is YES.

This widget could not be displayed.