C
HAPTER
20
| System Management Commands
Time
– 753 –
COMMAND MODE
Global Configuration
COMMAND USAGE
You can enable NTP authentication to ensure that reliable updates are
received from only authorized NTP servers. The authentication keys and
their associated key number must be centrally managed and manually
distributed to NTP servers and clients. The key numbers and key values
must match on both the server and client.
EXAMPLE
Console(config)#ntp authenticate
Console(config)#
RELATED COMMANDS
ntp authentication-key (753)
ntp
authentication-key
This command configures authentication keys and key numbers to use
when NTP authentication is enabled. Use the no form of the command to
clear a specific authentication key or all keys from the current list.
SYNTAX
ntp authentication-key number md5 key
no ntp authentication-key [number]
number - The NTP authentication key ID number. (Range: 1-65535)
md5 - Specifies that authentication is provided by using the
message digest algorithm 5.
key - An MD5 authentication key string. The key string can be up to
32 case-sensitive printable ASCII characters (no spaces).
DEFAULT SETTING
None
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† The key number specifies a key value in the NTP authentication key list.
Up to 255 keys can be configured on the switch. Re-enter this
command for each server you want to configure.
â—† Note that NTP authentication key numbers and values must match on
both the server and client.
â—† NTP authentication is optional. When enabled with the ntp
authenticate command, you must also configure at least one key
number using this command.
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