New Training: Describe and Configure the Network Time Protocol (NTP)
In this 5-video skill, CBT Nuggets trainer Jeremy Cioara teaches you how to configure Network Time Protocol (NTP) in a single master or NTP peer scenario. Watch this new Cisco training.
Watch the full course: Cisco CCNP Enterprise Core
This training includes:
25 minutes of training
You’ll learn these topics in this skill:
Introduction – Describe and Configure the Network Time Protocol (NTP)
Why Use Time Synchronization?
How NTP Works
Base NTP Configuration
NTP Stratum Preference and Peers
What is the NTP Stratum Model?
The NTP Stratum Model is a means of organizing time servers in an NTP network within a hierarchy, so that NTP clients can evaluate the most accurate time source, and to prevent timing loops. The model uses levels, which range from 0 to 15. These levels represent the relative distance of a particular device to a reference clock, from near to far.
A Stratum 0 device is the clock itself, such as an atomic or GPS clock. It is used as a reference clock for a Stratum 1 server, which offers the most accurate time in an NTP network. These servers, in turn, distribute time to Stratum 2 servers and clients. The lower the Stratum number, the lower the accuracy of the time. Because of this, clients using NTP protocol cannot accept times from a Stratum 15 device.
A group of Stratum devices that are on the same level are called NTP peers.