Cisco Systems SMC-169 manual Implementing NTP on Cisco IOS XR Software

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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

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.

 

 

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

Cisco IOS XR System Management Configuration Guide

SMC-169

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Contents Implementing NTP on Cisco IOS XR Software SMC-170 NTP Functional OverviewPoll-Based Associations Configuring Poll-Based AssociationsSMC-171 SMC-172 Summary StepsBroadcast-Based NTP Associations Configuring Broadcast-Based NTP AssociationsSMC-173 SMC-174 NTP Access Groups Configuring NTP Access GroupsSMC-175 SMC-176 SMC-177 NTP Authentication Configuring NTP AuthenticationSMC-178 SMC-179 Supported is md5SMC-180 Disabling NTP Services on a Specific InterfaceSMC-181 SMC-182 Configuring the Source IP Address for NTP PacketsSMC-183 SMC-184 Configuring the System as an Authoritative NTP ServerSMC-185 Updating the Hardware ClockSMC-186 Examples Verifying the Status of the External Reference ClockSMC-187 Configuring Broadcast-Based Associations Example Configuring Poll-Based Associations ExampleSMC-188 Configuring NTP Authentication Example Configuring NTP Access Groups ExampleSMC-189 Disabling NTP on an Interface Example Configuring the Source IP Address for NTP Packets ExampleSMC-190 Related Documents Updating the Hardware Clock ExampleStandards MIBsTechnical Assistance RFCsSMC-192