Licensing Requirements for NTP
The following table shows the licensing requirements for this feature:
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.
• NTP operates when the clock protocol is set to NTP. Configuring PTP and NTP together is not supported.
• 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.
Cisco Nexus 3548 Switch NX-OS System Management Configuration Guide, Release 7.x
23
Configuring NTP
Licensing Requirements for NTP
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