Routing

Hi everyone,

I am wondering what the below command do:

set system ntp server 99.99.99.1 prefer

set system ntp server 99.99.99.2

I thought if there are multiple NTP severs like above, JUNOS will pick the one with prefer . In order to prove this, I set up this lab:

MX is configured with following NTP:

But vMX has selected 99.99.99.2 not 99.99.99.1 even though 99.99.99.1 is stratum 1 and is configured with " Prefer" as shown  below

What is exactly the selection criteria vMX is using to select NTP server above?

Much appreciated!!

Hi

You have to check "reach".   "reach" indicates how many times the access was successful.

99.99.99.1's  "reach" is 0 (no reach).

99.99.99.2's  "reach" is 3 (this means that junos could access NTP server twice), so junos selects 99.99.99.2.

99.99.99.1's NTP server is working？