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:
- 5 videos
- 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.