Cisco Nexus 3548 - Guidelines and Limitations for NTP; Default Settings

License RequirementProduct
NTP requires no license. Any feature not included in
a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to
you.
Cisco NX-OS
Guidelines and Limitations for NTP
NTP has the following configuration guidelines and limitations:
•
To configure NTP, you must have connectivity to at least one server that is running NTP.
•
You should have a peer association with another device only when you are sure that your clock is reliable
(which means that you are a client of a reliable NTP server).
•
A peer configured alone takes on the role of a server and should be used as a backup. If you have two
servers, you can configure several devices to point to one server and the remaining devices to point to
the other server. You can then configure a peer association between these two servers to create a more
reliable NTP configuration.
•
If you have only one server, you should configure all the devices as clients to that server.
•
You can configure up to 64 NTP entities (servers and peers).
•
If CFS is disabled for NTP, then NTP does not distribute any configuration and does not accept a
distribution from other devices in the network.
•
After CFS distribution is enabled for NTP, the entry of an NTP configuration command locks the network
for NTP configuration until a commit command is entered. During the lock, no changes can be made to
the NTP configuration by any other device in the network except the device that initiated the lock.
•
If you use CFS to distribute NTP, all devices in the network should have the same VRFs configured as
you use for NTP.
•
If you configure NTP in a VRF, ensure that the NTP server and peers can reach each other through the
configured VRFs.
•
You must manually distribute NTP authentication keys on the NTP server and Cisco NX-OS devices
across the network.
Default Settings
Table 13: Default NTP Parameters
DefaultParameters
disabledNTP authentication
enabledNTP access
Cisco Nexus 3548 Switch NX-OS System Management Configuration Guide, Release 6.x
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Configuring NTP
Guidelines and Limitations for NTP