ntp server

Specifies or adds an NTP server IP address and optionally associates an authentication key to the server.

Syntax

ntp server {ip_address } [ source-interface-type {ethernet source-interface-number | loopback source-interface-number | management source-interface-number| ve source-interface-number }][ key key_id ] [ maxpoll interval ] [ minpoll interval] [ use-vrf vrf_name] [ version 3 | 4 ]

no ntp server {ip_address }

Command Default

No default peer is configured.

Parameters

ip_address

Specifies the IPv4 or IPv6 address of the NTP peer.

source-interface-type

Specifies the type of interface.

ethernet: Specifies an Ethernet interface as the source type.
loopback: Specifies a loopback interface as the source type.
management: Specifies a management interface as the source type.
ve: Specifies a VE as the source type.
source-interface-number: Specifies the interface number. Valid values range from 1 through 4096.

key key_id

Specifies the symmetric key ID. By default, no symmetric key is configured. The range is 1 to 65,534.

maxpoll interval

Specifies the longest polling interval. The range is 4 to 17. Default is 10. The interval argument is power of 2, for example: 3=8s, 4=16s, 5=32s, 6=64s, 7=128s, 8=256s, 9=512s.

minpoll interval

Specifies the shortest polling interval. The range is 4 to 17. The default is 6. The interval argument is power of 2, for example: 3=8s, 4=16s, 5=32s, 6=64s, 7=128s, 8=256s, 9=512s.

use-vrfvrf_name

Specifies the VRF name to synchronize the time with server. The default is mgmt-vrf.

version 3 | 4

Specifies the NTP version supported by the peer. The default is 4.

Modes

Global configuration mode

Usage Guidelines

Use this command to add an NTP server IPv4 or IPv6 address to a list of server IP addresses, or to associate an existing authentication key with an NTP server IP address.

The maximum number of NTP servers allowed is five.

Network Time Protocol (NTP) commands must be configured on each individual switch.

Use the no ntp server ip-address command to remove the specified NTP server IP address. Removing the current active NTP server resets the NTPstatus to "LOCL" until a new, active server is selected.

Use the no ntp server ip-address key key-id command to remove the key from the specified NTP IP address.

By default, all management services are enabled on the management VRF ("mgmt-vrf") and the default VRF ("default-vrf").

Examples

This example associates a configured key ID of 15 to an NTP server on the management VRF.

device(config)# ntp peer 1.2.3.4
device(config-server-1.2.3.4/mgmt-vrf)# key 15