Ntp Authenticate - Cisco Nexus 3548 Command Reference Manual

ntp authenticate

ntp authenticate
To prevent the system from synchronizing with unauthenticated, unconfigured network peers, use the
ntp authenticate command. Use the no form of this commend to allow synchronization with
unauthenticated, unconfirmed network peers.
Syntax Description
This command has no arguments or keywords.
Command Default
None
Command Modes Global configuration mode
Command History Release
5.0(3)A1(1)
Usage Guidelines
If the system has been configured with the ntp passive, ntp broadcast client, or ntp multicast client
commands, when NTP receives an incoming symmetric active, broadcast, or multicast packet, it can set
up an ephemeral peer association in order to synchronize with the sender.
If ntp authenticate is specified, when a symmetric active, broadcast, or multicast packet is received, the
system will not synchronize to the peer unless the packet carries one of the authentication keys specified
in the ntp trusted-key global configuration command.
To prevent synchronization with unauthorized network hosts, ntp authenticate should be specified any
time ntp passive, ntp broadcast client, or ntp multicast client has been specified unless other
measures, such as the ntp access-group command, have been taken to prevent unauthorized hosts from
communicating with the NTP service on the device.
Note
Related Commands Command
ntp authentication-key Configures an NTP authentication key.
ntp trusted-key
show ntp
authentication-status
Cisco Nexus 3548 Switch NX-OS System Management Command Reference
94
ntp authenticate
no ntp authenticate
Modification
This command was introduced.
This command does not authenticate peer associations configured via the ntp server and ntp
peer commands. To authenticate ntp server and ntp peer associations, specify the key keyword.
Description
Specifies one or more keys that a time source must provide in its NTP
packets in order for the device to synchronize to it.
Displays the status of NTP authentication.
System Management Commands
OL-27851-02