Licensing Requirements For Ntp; Guidelines And Limitations For Ntp - Cisco Nexus 3548 series Configuration Manual

Configuring NTP

Licensing Requirements for NTP

The following table shows the licensing requirements for this feature:
Product
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
• A peer configured alone takes on the role of a server and should be used as a backup. If you have two
• 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
• After CFS distribution is enabled for NTP, the entry of an NTP configuration command locks the network
• If you use CFS to distribute NTP, all devices in the network should have the same VRFs configured as
• If you configure NTP in a VRF, ensure that the NTP server and peers can reach each other through the
• You must manually distribute NTP authentication keys on the NTP server and Cisco NX-OS devices
License Requirement
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.
(which means that you are a client of a reliable NTP server).
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.
distribution from other devices in 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.
you use for NTP.
configured VRFs.
across the network.
Cisco Nexus 3548 Switch NX-OS System Management Configuration Guide, Release 7.x

Licensing Requirements for NTP

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