Cisco ACE-4710-K9 Administration Guide - Page 47

Chapter 1 Setting Up the ACE Synchronizing the ACE with an NTP Server Viewing the System Clock Settings To display the system clock of the ACE, use the show clock command in Exec mode. The syntax of this command is as follows: show clock For example, to view the current clock settings, enter: host1/Admin# show clock Sun Oct 7 07:43:02 UTC 2007 Synchronizing the ACE with an NTP Server The Network Time Protocol (NTP) enables you to synchronize the ACE system clock to a time server. NTP is an Internet protocol designed to synchronize the clocks of computers over a network. Typically, an NTP network receives its time from an authoritative time source, such as a radio clock or an atomic clock attached to a time server, and assures accurate local time-keeping. NTP distributes this time across the network. The NTP protocol can synchronize distributed clocks within milliseconds over long time periods. NTP runs over User Datagram Protocol (UDP), which runs over IP. NTP is documented in RFC 1305. All NTP communication uses Coordinated Universal Time (UTC), which is the same as Greenwich Mean Time. An NTP server must be accessible by the client ACE. Note If you are configuring application acceleration and optimization functionality (as described in the Cisco 4700 Series Application Control Engine Appliance Application Acceleration and Optimization Configuration Guide), and you plan to use an optional Cisco AVS 3180A Management Console with multiple ACE nodes, we strongly recommend that you synchronize the system clock of each ACE node with an NTP server. AppScope performance monitoring relies on very accurate time measurement, in the millisecond range. If you instal multiple ACE appliances, you must synchronize the clocks so that different parts of a single transaction can be handled by different nodes. OL-11157-01 Cisco 4700 Series Application Control Engine Appliance Administration Guide 1-21