Посмотреть ограничения на конкретной модели 

из cli 

print tablesize


There are 3 numbers associated with each table value:

1) The first number refers to the maximum number allowed for the child table in its parent entry.

2) The second number refers to maximum number allowed per VDOM limit.

3) The third number refers to the system global limit.



Через сайт 

https://docs.fortinet.com/max-value-table