Patton electronic SmartNode 4110 Series Defining Sntp client constant offset to GMT, Time from UTC

SmartWare Software Configuration Guide 26 • SNTP client configuration

Defining SNTP client constant offset to GMT

Setting the offset of the device local time zone from Greenwich Mean Time is required if the local time shall be used for time dependent routing decisions or other reasons. Greenwich Mean Time (GMT) is also known as Zulu Time and Universal Time Coordinated (UTC), refer to http://greenwichmeantime.com/ for more details and information about your time zone and offset to GMT.

Note Be aware that summertime offset is not automatically adjusted!

Use the “clock local offset” command to configure the local clock offset.

This procedure describes how to display the local time.

Mode: Configure

Step	Command	Purpose
1	[name]#show clock local	Displays the local time, UTC and the offset of the local
		time from UTC.

This procedure describes how to use the clock local offset command.

Mode: Configure

Step	Command	Purpose
1	[name](cfg)#clock local offset (+-	Sets the offset from UTC to local time.
	)hh:mm

Defining the SNTP client anycast address

Anycast mode is designed for use with a set of cooperating servers whose addresses are not known beforehand. An anycast client sends a request to the designated local broadcast or multicast group address as described below. For this purpose, the NTP multicast group address assigned by the IANA is used. One or more anycast servers listen on the designated local broadcast address or multicast group address. Each anycast server, upon receiving a request, sends a unicast reply message to the originating client. The client then binds to the first such message received and continues operation in unicast mode. Subsequent replies from other anycast servers are ignored.

In anycast mode, the SmartNode sends a request to a designated local broadcast or multicast group address and expects a reply from one or more anycast servers. The SmartNode uses the first reply received to establish the particular server for subsequent unicast operations. Later replies from this server (duplicates) or any other server are ignored.

Other than the selection of address in the request, the operations of anycast and unicast clients are identical.

This procedure describes how to set local broadcast address or multicast group address to which the anycast request is sent

SNTP client configuration task list 287