Cisco Systems SMC-169 manual SMC-176

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Implementing NTP on Cisco IOS XR Software

How to Implement NTP on Cisco IOS XR Software

If the source IP address matches the access lists for more than one access type, the first type is granted. If no access groups are specified, all access types are granted to all systems. If any access groups are specified, only the specified access types are granted.

For details on NTP control queries, see RFC 1305 (NTP version 3).

SUMMARY STEPS

1.configure

2.ntp

3.access-group {peer query-only serve serve-only}access-list-name

4.end or commit

DETAILED STEPS

 

Command or Action

Purpose

Step 1

 

 

configure

Enters global configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router# configure

 

Step 2

 

 

ntp

Enters NTP configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router(config)# ntp

 

 

 

 

Cisco IOS XR System Management Configuration Guide

SMC-176

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Contents Implementing NTP on Cisco IOS XR Software NTP Functional Overview SMC-170SMC-171 Configuring Poll-Based AssociationsPoll-Based Associations Summary Steps SMC-172SMC-173 Configuring Broadcast-Based NTP AssociationsBroadcast-Based NTP Associations SMC-174 SMC-175 Configuring NTP Access GroupsNTP Access Groups SMC-176 SMC-177 SMC-178 Configuring NTP AuthenticationNTP Authentication Supported is md5 SMC-179Disabling NTP Services on a Specific Interface SMC-180SMC-181 Configuring the Source IP Address for NTP Packets SMC-182SMC-183 Configuring the System as an Authoritative NTP Server SMC-184Updating the Hardware Clock SMC-185SMC-186 SMC-187 Verifying the Status of the External Reference ClockExamples SMC-188 Configuring Poll-Based Associations ExampleConfiguring Broadcast-Based Associations Example SMC-189 Configuring NTP Access Groups ExampleConfiguring NTP Authentication Example SMC-190 Configuring the Source IP Address for NTP Packets ExampleDisabling NTP on an Interface Example Updating the Hardware Clock Example Related DocumentsStandards MIBsSMC-192 RFCsTechnical Assistance