Chapter 1 Setting Up the ACE
Synchronizing the ACE with an NTP Server
1-22
Cisco 4700 Series Application Control Engine Appliance Administration Guide
OL-11157-01
This section contains the following topics:
•
Configuring NTP Server and Peer Associations
•
Viewing NTP Statistics and Information
•
.Clearing NTP Statistics
Configuring NTP Server and Peer Associations
An NTP association can be a peer association, which means that the ACE is
willing to synchronize to the other system or to allow the other system to
synchronize to the ACE. An NTP association can also be a server association,
which means that only this system will synchronize to the other system, not the
other way around. You can identify multiple servers; the ACE uses the most
accurate server. To configure the ACE system clock to synchronize a peer (or to
be synchronized by a peer) or to be synchronized by a time server, use the
ntp
command.
The syntax of this command is as follows:
ntp
{
peer
ip_address1
[
prefer
] |
server
ip_address2
[
prefer
]}
Note
Only users authenticated in the Admin context can use the
ntp peer
and
ntp
server
commands.
The keywords, arguments, and options are:
•
peer
—Configure the ACE system clock to synchronize a peer or to be
synchronized by a peer. You can specify multiple associations.
•
ip_address1
—IP address of the peer providing or being provided by the clock
synchronization.
•
prefer
—(Optional) Makes this peer the preferred peer that provides
synchronization. Using the
prefer
keyword reduces switching back and forth
between peers.
•
server
—Configures the ACE system clock to be synchronized by a time
server. You can specify multiple associations.
•
ip_address2
—IP address of the time server that provides the clock
synchronization.
