Good that I scrolled till end .. as got confused with accepted solution . Or maybe difference between theory and practical implementation

Thanks Rick . That was really helpful . Regarding 4 NTP AS , we manage network for critical services and hence time is for utmost importance .And yes , we have configure each core with all 4 NTP Servers (so yes lots of redundancy :-) ) .  

Thanks for reply Richard .  I think you have answered my query with below statement  "No it is not necessary that each individual ntp peer should peer directly to the device configured as Master. It is sufficient that a device has learned ntp time fr...

Hello Richard , Just keen to understand what is expected behaviors  in below scenario : Incase we loose  ntp sync to all the authoritative source and one of the IOS/NX-OS core device is configured as NTP Master . Does all NTP Peers should sync to NTP...