Ntp Multicast Associations; Ntp As A Time Server; Distributing Ntp Using Cfs; Clock Manager - Cisco Nexus 7000 Series Configuration Manual
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- Command reference manual (1018 pages) ,
- Reference manual (746 pages) ,
- Configuration manual (536 pages)
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Configuring NTP
NTP Multicast Associations
When the device operates as an NTP multicast server, it sends NTP multicast messages to a designated IPv4
or IPv6 multicast group IP address.
When the device operates as an NTP multicast client, it listens for NTP multicast packets that are sent by an
NTP multicast server to a designated IPv4 or IPv6 multicast group IP address.
NTP multicast servers allow you to synchronize a large number of clients without creating a lot of NTP traffic
because unsolicited messages are sent to a designated multicast group address, and ordinarily no request is
expected from the clients.
NTP as a Time Server
The Cisco NX-OS device can use NTP to distribute time. Other devices can configure it as a time server. You
can also configure the device to act as an authoritative NTP server, enabling it to distribute time even when
it is not synchronized to an outside time source.
Distributing NTP Using CFS
Cisco Fabric Services (CFS) distributes the local NTP configuration to all Cisco devices in the network.
After enabling CFS on your device, a network-wide lock is applied to NTP whenever an NTP configuration
is started. After making the NTP configuration changes, you can discard or commit them.
In either case, the CFS lock is then released from the NTP application.
Clock Manager
Clocks are resources that need to be shared across different processes. Multiple time synchronization protocols,
such as NTP, might be running in the system.
The clock manager allows you to specify the protocol to control the various clocks in the system. Once you
specify the protocol, the system clock starts updating. For information on configuring the clock manager, see
the Cisco Nexus 7000 Series NX-OS Fundamentals Configuration Guide.
High Availability
Stateless restarts are supported for NTP. After a reboot or a supervisor switchover, the running configuration
is applied. For more information on high availability, see the Cisco Nexus 7000 Series NX-OS High Availability
and Redundancy Guide.
You can configure NTP peers to provide redundancy in case an NTP server fails.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
NTP as a Time Server
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