NTP Client Configuration

To configure the system as an NTP client:

1. Ping the selected NTP servers to ensure that the system can reach them.
2. Configure the system to acquire NTP data by completing one or both of the following actions:
   • Assign the NTP servers.
   • Enable the system to receive broadcasts on an interface.
3. If you enable the system to receive broadcasts on an interface, set the estimated round-trip delay between the system and an NTP broadcast server.
4. Disable NTP on interfaces that you do not want to receive NTP communications for security or other reasons.

ntp broadcast-client

• Use to enable the system to receive NTP broadcasts on an interface.
• Example

  host1(config-if)#ntp broadcast-client

• Use the no version to prevent the system from receiving NTP broadcasts.
• See ntp broadcast-client.

ntp broadcast-delay

• Use to set the estimated round-trip delay in the range 0 to 999,999 microseconds between the system and an NTP broadcast server.
• Example

  host1(config)#ntp broadcast-delay 2000

• Use the no version to set the estimated round-trip delay to the default, 3000 microseconds.
• See ntp broadcast-delay.

ntp disable

• Use to disable NTP on an interface.
• Example

  host1(config-if)#ntp disable

• Use the no version to reenable NTP on an interface.
• See ntp disable.

ntp server

• Use to assign an NTP server to the system and to customize the way the server communicates with the system.
• Specify the source option to direct responses from the NTP server to a specific interface on the system and override the ntp source command.
• Example

  host1(config)#ntp server 192.35.42.1 version 3 prefer source atm 3/0.1

• Use the no version to terminate communications between the system and an NTP server.
• See ntp server.

ping

• Use to check that the system can reach an NTP server.
• Example

  host1(config)#ping 192.35.42.1

• There is no no version.
• See ping.

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