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CCNA 200-301 Portable Command Guide 5th Edition 20

Configure and secure NTP for accurate time across your network. Learn NTP design, troubleshooting, clock settings, and timestamps with configuration examples to support SLAs and log accuracy.

Alice Edwards
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CHAPTER 19Configuring Network TimeProtocol (NTP)This chapter provides information about the following topics:DNTP configurationn NTP design□Securing NTPDVerifying and troubleshooting NTP1Setting the clock on a routern Using time stamps□Configuration example: NTPMost networks today are being designed with high performance and reliability in mind.Delivery of content is, in many cases, guaranteed by service level agreements (SLAs).Having your network display an accurate time is vital to ensuring that you have the bestinformation possible when reading logging messages or troubleshooting issues.NTP ConfigurationEdmonton(config)#ntp server209.165.200.254Configures the Edmonton router to synchro-nize its clock to a public NTP server at address209.165.200.254NOTE:This command makes the Edmontonrouter an NTP client to the external NTP serverNOTE:A Cisco IOS router can be both a clientto an external NTP server and an NTP server toclient devices inside its own internal networkNOTE:When NTP is enabled on a Cisco IOSrouter, it is enabled on all interfacesEdmonton(config)#ntp server209.165.200.234 preferSpecifies a preferred NTP server if multipleones are configuredTIP:It is recommended to configure more thanone NTP serverEdmonton(config-if)#ntp disableDisables the NTP server function on a specificinterface. The interface will still act as an NTPclientTIP:Use this command on interfacesconnected to external networksTechnet24

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