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SMC-169
Cisco IOS XR System Management Configuration Guide
Implementing NTP on Cisco IOS XR Software
Network Time Protocol (NTP) is a protocol designed to time-synchronize devices within a network. The
Cisco IOS XR software implements NTPv4. NTPv4 retains backwards compatibility with the older
versions of NTP, including NTPv3 and NTPv2 but excluding NTPv1, which has been discontinued due
to security vulnerabilities.
This module describes the new and revised tasks you need to implement NTP on your Cisco IOS XR
network.
Note For more information about NTP on the Cisco IOS XR software and complete descriptions of the NTP
commands listed in this module, you can refer to the “Related Documents” section of this module. To
locate documentation for other commands that might appear in the course of running a configuration
task, search online in the Cisco IOS XR software master command index.
Feature History for Implementing NTP on Cisco IOS XR Software Contents
Contents
• Prerequisites for Implementing NTP on Cisco IOS XR Software, page SMC-170
• Information About Implementing NTP on Cisco IOS XR Software, page SMC-170
• How to Implement NTP on Cisco IOS XR Software, page SMC-171
• Configuration Examples for Implementing NTP on Cisco IOS XR Software, page SMC-187
• Additional References, page SMC-191
Release Modification
Release 2.0 This feature was introduced on the Cisco CRS-1.
Release 3.0 No modification.
Release 3.2 Support was added for the Cisco XR 12000 Series Router.
Release 3.3.0 No modification.