Cisco Nexus 5600 Series - Licensing Requirements; Prerequisites for NTP; Guidelines and Limitations for NTP

Licensing Requirements
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. For a complete explanation of the Cisco NX-OS
licensing scheme, see the Cisco NX-OS Licensing
Guide.
Cisco NX-OS
Prerequisites for NTP
NTP has the following prerequisites:
•
To configure NTP, you must have connectivity to at least one server that is running NTP.
Guidelines and Limitations for NTP
NTP has the following configuration guidelines and limitations:
•
The Cisco NX-OS software supports NTP version 4 (NTPv4).
•
NTP server functionality is 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, 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.
Cisco Nexus 5600 Series NX-OS System Management Configuration Guide, Release 7.x
OL-31641-01 221
Configuring NTP
Licensing Requirements