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Page 2 - Prerequisites for Implementing NTP on Cisco IOS XR Software; NTP Functional Overview

Implementing NTP on Cisco IOS XR Software Prerequisites for Implementing NTP on Cisco IOS XR Software SMC-170 Cisco IOS XR System Management Configuration Guide Prerequisites for Implementing NTP on Cisco IOS XR Software The following prerequisites are required to implement NTP in your network opera...

Page 3 - How to Implement NTP on Cisco IOS XR Software; Configuring Poll-Based Associations; Poll-Based Associations

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-171 Cisco IOS XR System Management Configuration Guide The communications between machines running NTP (known as “associations”) are usually staticallyconfigured; each machine is given the IP address of all m...

Page 4 - SUMMARY STEPS; DETAILED STEPS; Command or Action

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-172 Cisco IOS XR System Management Configuration Guide The following are two most commonly used, poll-based association modes: • Client mode • Symmetric active mode The client and the symmetric active modes s...

Page 5 - Configuring Broadcast-Based NTP Associations; Broadcast-Based NTP Associations

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-173 Cisco IOS XR System Management Configuration Guide Configuring Broadcast-Based NTP Associations This task explains how to configure broadcast-based NTP associations. Note No specific command enables NTP; ...

Page 7 - Configuring NTP Access Groups; NTP Access Groups

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-175 Cisco IOS XR System Management Configuration Guide Configuring NTP Access Groups This task explains how to configure NTP access groups. Note No specific command enables NTP; the first NTP configuration co...

Page 10 - Configuring NTP Authentication; NTP Authentication

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-178 Cisco IOS XR System Management Configuration Guide Configuring NTP Authentication This task explains how to configure NTP authentication. Note No specific command enables NTP; the first NTP configuration ...

Page 12 - Disabling NTP Services on a Specific Interface

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-180 Cisco IOS XR System Management Configuration Guide Disabling NTP Services on a Specific Interface This task explains how to disable NTP services on a specific interface. NTP services are disabled on all i...

Page 14 - Configuring the Source IP Address for NTP Packets

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-182 Cisco IOS XR System Management Configuration Guide Configuring the Source IP Address for NTP Packets This task explains how configure the source IP address for NTP packets. When the system sends an NTP pa...

Page 16 - Configuring the System as an Authoritative NTP Server

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-184 Cisco IOS XR System Management Configuration Guide Configuring the System as an Authoritative NTP Server This task explains how to configure the router as an authoritative NTP server. You can configure th...

Page 17 - Updating the Hardware Clock

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-185 Cisco IOS XR System Management Configuration Guide Updating the Hardware Clock This task explains how to configure the hardware clock to be periodically updated from the softwareclock running NTP. On devi...

Page 19 - Verifying the Status of the External Reference Clock; Examples; The following is sample output from the show ntp status command:

Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-187 Cisco IOS XR System Management Configuration Guide Verifying the Status of the External Reference Clock This task explains how to verify the status of NTP components. Note The commands can be entered in a...

Page 20 - Configuring Poll-Based Associations: Example

Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-188 Cisco IOS XR System Management Configuration Guide Configuration Examples for Implementing NTP on Cisco IOS XRSoftware This section contains the following examples: • Configuring Po...

Page 21 - Configuring NTP Access Groups: Example; Configuring NTP Authentication: Example

Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-189 Cisco IOS XR System Management Configuration Guide Configuring NTP Access Groups: Example The following example shows a NTP access group configuration where the following access gro...

Page 22 - Disabling NTP on an Interface: Example

Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-190 Cisco IOS XR System Management Configuration Guide • The router is configured to synchronize only to systems providing authentication key 3 in their NTPpackets. ! ntp authentication...

Page 23 - Updating the Hardware Clock: Example; Additional References; Related Documents

Implementing NTP on Cisco IOS XR Software Additional References SMC-191 Cisco IOS XR System Management Configuration Guide Updating the Hardware Clock: Example The following example shows an NTP configuration in which the router is configured to update itshardware clock from the software clock at pe...

Page 24 - RFCs

Implementing NTP on Cisco IOS XR Software Additional References SMC-192 Cisco IOS XR System Management Configuration Guide RFCs Technical Assistance RFCs Title RFC 1305 Network Time Protocol, Version 3: Specification, Implementation,and Analysis RFC 1119 Network Time Protocol, Version 2: Specificati...