Ntp Configuration Distribution Using Cfs; High Availability For Ntp; Prerequisites For Ntp; Guidelines And Limitations For Ntp - Cisco MDS 9000 Series Configuration Manual

Configuring NTP

NTP Configuration Distribution Using CFS

You can enable NTP fabric distribution for all Cisco MDS switches in the fabric. When you perform NTP
configurations, and distribution is enabled, the entire server and peer configuration is distributed to all the
switches in the fabric.
You automatically acquire a fabric-wide lock when you issue the first configuration command after you
enabled distribution in a switch. The NTP application uses the effective and pending database model to store
or commit the commands based on your configuration.

High Availability for NTP

The Cisco NX-OS software supports stateless restarts for NTP. After a reboot or a supervisor switchover, the
running configuration is applied. For more information on high availability, see the .
You can configure NTP peers to provide redundancy in case an NTP server fails.
Note

Prerequisites for NTP

NTP has the following prerequisite:
• If you 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:
• 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 only have one server, you should configure all the devices as clients to that server.
• You can configure up to 64 NTP entities (servers and peers).
Configuring NTP
This section describes how to configure NTP.
OL-29291-02
(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.
NTP Configuration Distribution Using CFS
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