NTP Stratum 2 Server

Preface

NTP Stratum 2 Server is server that is using NTP Stratum 1 Server for as his reference time source. It is possible to interconnect more as one NTP Stratum 2 server between each other. This will provide us failover in the case that the NTP Stratum 1 server will be unavailable.

In this case we will use NTPD demon that is running on NTP Stratum 1 server as well we'll use NTPD demon running on NTP Stratum 2 Server. The whole communication will be running on 123/UDP port.

In exact same way you can configure any NTP Stratum server that is higher as NTP Stratum 2

Configure NTP Stratum 2 Server

The whole configuration of NTPD is stored in “ /etc/ntp.conf “ file. To configure it, just insert list of your NTP Stratum 1 servers in the format:
“server <IP_or_FQDN> “

[root@NTP-Stratum-2 ~]# cat /etc/ntp.conf | grep server
server 10.0.12.13

Status of NTP Stratum 2 Server

To check the status of any accessible NTPD demon you can use on your NTP Client site the application “ ntpq “

[root@NTP-Stratum-2 ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 10.0.12.13           .GPS.      0 l   21   64  377    0.000    0.013   0.020
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