Patton electronic SmartNode 4110 Series Selecting Sntp time servers, Unicast anycast multicast

SmartWare Software Configuration Guide 26 • SNTP client configuration

Selecting SNTP time servers

This procedure describes how to select a primary and secondary SNTP time server

Mode: Configure

Step	Command	Purpose
1	node(cfg)#sntp-client server primary host	Enter the SNTP primary server IP
		address or hostname
2	node(cfg)#sntp-client server secondary host	Enter the SNTP secondary server IP
		address or hostname

Example: Selecting SNTP time servers

In the following example an internal SNTP time server (172.16.1.10) is selected as primary and utcnist.colo- rado.edu (128.138.140.44) as secondary SNTP time server.

node(cfg)#sntp-client server primary 172.16.1.10 node(cfg)#sntp-client server secondary 128.138.140.44

Defining SNTP client operating mode

A SNTP client can operate in multicast mode, unicast mode or anycast mode:

•In unicast mode (point to point), the client sends a request to a designated server at its unicast address and expects a reply from which it can determine the time and, optionally, the roundtrip delay and local clock offset relative to the server.

•In anycast mode (multipoint to point), the client sends a request to a designated local broadcast or multicast group address and expects a reply from one or more anycast servers.

•In multicast mode (point to multipoint), the client sends no request and waits for a broadcast from a desig- nated multicast server.

Note Unicast mode is the default SNTP client operating mode.

This procedure describes how to configure the SNTP client operating mode

Mode: Configure

Step Command Purpose

1node(cfg)#sntp-clientoperating-modeConfigures the SNTP client operating mode to uni-

{unicast anycast multicast} cast, anycast or multicast mode

Note When selecting the anycast operating-mode you have to define the IP address where the anycast request is sent. Refer to section “Defining the SNTP client anycast address” on page 287 for more details.

SNTP client configuration task list 284