This document provides a sample configuration for Network Time Protocol (NTP) on Cisco Nexus 7000 Series Switches.
Ensure that you meet these requirements before you attempt this configuration:
Have basic knowledge of configuration on Nexus 7000 Series Switches
Have basic knowledge of NTP
The information in this document is based on the Nexus 7000 Series Switch.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Refer to the for more information on document conventions.
The Network Time Protocol (NTP) synchronizes the time of day among a set of distributed time servers and clients so that you can correlate events when you receive system logs and other time-specific events from multiple network devices. NTP uses the User Datagram Protocol (UDP) as its transport protocol. All NTP communications use Coordinated Universal Time (UTC).
Cisco recommends that you use the public NTP servers available on the Internet. If the network is isolated from the Internet, Cisco NX-OS allows you to configure the time as though it were already synchronized through the NTP server.
In this section, you are presented with the information to configure the NTP features described in this document.
In order to configure NTP on a Nexus 7000 switch, you must have connectivity to at least one server that is running NTP.
NTP must be configured in the default virtual device context (VDC). It cannot be configured in any other VDC.
If you configure NTP in a VRF, ensure the NTP server and peers can reach each other through the configured VRFs.
This document uses this network setup:
This document uses these configurations:
Nexus 7000 Switch
!--- Form an association with a server. Use the prefer keyword to make this !--- server as preferred NTP server.
Nexus_7000(config)#ntp server 188.8.131.52 prefer
Nexus_7000(config)#ntp server 184.108.40.206
!--- Configure the source interface for all NTP packets.
Nexus_7000(config)#ntp source-interface vlan1
!--- Configure the device as an authoritative NTP server.
Nexus_7000(config)#ntp master 1
Nexus_7000(config-if)#no ip redirects
Nexus_7000(config-if)#ip address 172.20.100.34/24
Nexus_7000(config-if)#ip address 172.20.100.30/24 secondary
!--- Save the configurations in the device.
Nexus_7000(config)#copy running-config startup-config
Use this section to confirm that your configuration works properly.
The Cisco CLI Analyzer (registered customers only) supports certain show commands. Use the Cisco CLI Analyzer to view an analysis of show command output.
Nexus_7000#show ntp peers
Peer IP Address Serv/Peer
127.127.1.0 Server (configured)
220.127.116.11 Server (configured)
18.104.22.168 Server (configured)