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Category: Cisco | Networking

Network Time Protocol (NTP) is a protocol used in order to synchronize the clocks of different network entities. It uses UDP/123. The main objective to use this protocol is to avoid the effects of variable latency over the data networks.
This document provides a sample configuration for the Cisco ACS to synchronize its clock with NTP server. ACS 5.x is allowed to configure up to two NTP servers.

In this section, you are presented with the information to configure the features described in this document.

Note: Use the Command Lookup Tool (registered customers only) to obtain more information on the commands used in this section.
NTP Configuration on Cisco ACS

In order to synchronize the time of Cisco ACS with an NTP server, complete these steps:

Manually configure the date and time with the clock set command.

Specify the time zone with the clock timezone command.

Specify the NTP server with the NTP server command.

NTP follows a client-server hierarchy. When an NTP client is configured with an NTP server, the Reference Clock of the NTP server is passed to the client. It takes approximately 10-20 minutes to get the accurate time from the NTP server and depends on the delay occurs in order to reach the NTP server.

Cisco ACS uses the NTP daemon in order to synchronize its clock with the NTP server. It does not support the Simple NTP, SNTP. When the NTP daemon starts, ACS sends a packet to the NTP server that contains its original time (Local). Then NTP server replies to the packet with the insertion of its Reference Clock time. Once the NTP client receives this packet, it logs the packet with its own local time in order to validate the traveling time taken by the packet. Several such packet exchanges occur in order to calculate the exact round trip delay time and offset values and finally the local time of NTP client is synchronized with the Reference Clock of the NTP server.
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