FortiSwitches are status not stable appearing onlin/offline frequentl. High CPU usage on Fortilink.

[ahamza89]

I have a Fortigate 601E v6.4.9 as a switch controller, with 2 FotiSwitch 1048E as MCLAG peers and multiple 124F on distribution.

Few switches suddenly went offline including 1x 1048E.

in LOGS it shows 

NTP is fine.

[ahamza89]

why I cannot configure mclag-icl command here.

[ede_pfau]

do you really set ".ntp.org" as NTP server? the hostname part is missing.

Please post output of 'diag sys ntp status'.

[ahamza89]

I disconnected all the Access switch from core, MCLAG-ICL wasn't enabled between core Switches (1048)

Now when connect Access switches set mclag-icl enable is not working.

Below is the what connections look like