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NTP access-group options

chinpohpang851
Beginner
Beginner

I still don't quite understand the option Peer, serve and query-only. I have some understanding about Peer, so both devices will compare each other to see which one's better but what criteria are they comparing (Stratum numer) and how the better one sync the time to other device?

"Serve" will allowed sync n query request but not updating its own clock right?

"query-only" what kind of query control ntp does? 

4 Replies 4

marce1000
VIP Mentor VIP Mentor
VIP Mentor

 

 

 1) serve - Allows time requests and NTP control queries, but does not allow the switch to synchronize itself to a device whose address passes the access list criteria.

 2) serve-only - Allows only time requests from a device whose address passes the access list criteria.

 3) query-only - Allows only NTP control queries from a device whose address passes the access list criteria.

 M.

balaji.bandi
VIP Community Legend VIP Community Legend
VIP Community Legend

herre is very good explanation Cisco design point of view

 

https://www.cisco.com/c/en/us/support/docs/availability/high-availability/19643-ntpm.html

BB

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chinpohpang851
Beginner
Beginner

any helpful article? I still can't find an article that explain the options.

chinpohpang851
Beginner
Beginner

let's assume R1(ntp server) and R2 (client) and Peer option is used under R1, does it mean R2's time can also overwrite R1's clock?

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