Technical Tip: How to add multiple NTP servers in FortiGate

Solution

In order to add multiple NTP server, this configuration is supported via CLI only.

Use the following configuration:

config system ntp

set ntpsync enable
set type custom
set syncinterval 60

config ntpserver
    edit 1
        set server "0.europe.pool.ntp.org"
    next
    edit 2
        set server "0.north-america.pool.ntp.org"
    next

    edit 3
        set server "0.asia.pool.ntp.org"
    next

    end
end

The global limit of NTP server on each FortiGate can be checked via 'print tablesize'.

system.ntp:interface: 0 256 512

As an example on FortiGate-101E, a total of 512 NTP servers can be defined.