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
