NTP Server Configuration

To enable a virtual router to act as an NTP server:

1. Access the virtual router context.
2. Specify that the virtual router acts as an NTP server.

   Caution: Be sure that you do not override a valid time source if you specify the stratum of the NTP server. Issuing the ntp master command on multiple systems in the network might lead to unreliable timestamps if those systems do not agree on the time.

3. (Optional) Specify the stratum of this NTP server.

ntp broadcast

• Use to enable broadcast server on an interface to send NTP broadcast messages periodically.
• The server sends the NTP broadcast messages to the local network broadcast address (255.255.255.255).
• Example—In this example, the interface supports NTP software, version 4, and a poll interval of 5 (32 seconds) for broadcasting NTP messages.

  host1:boston(config-if)#ntp broadcast version 4 5

• Use the no version to prevent the interface from sending NTP broadcast messages.
• See ntp broadcast.

ntp master

• Use to specify the stratum number of a virtual router you configured as an NTP server
• By default, the stratum number is set to the stratum number of the master plus one.

  Caution: Although you can specify a stratum number of 1, the system does not support stratum 1 service. The system can synchronize only with an NTP server, and not directly with an atomic clock or radio clock.

• Specify a stratum number for the system in the range 1 – 15. A stratum n server is n hops from an accurate time source.
• Example

  host1:boston(config)#ntp master

• Use the no version to restore the default stratum number.
• See ntp master.

ntp server enable

• Use to enable a virtual router to act as an NTP server.
• Example

  host1:boston(config)#ntp server enable

• Use the no version to prevent a virtual router from acting as an NTP server.
• See ntp server enable.

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