FortiGate 100F/600F - HA Management Interface Reservation

Forum|Forum|2 months ago
May 19, 2026
2 replies
66 views

Hi All,

We have a pair of 100F’s and a pair of 600F’s , these are in HA Active/Standby mode.

We have the management interface configured for well management, it has been suggested that we enable the Management Interface Reservation option within HA however there are no clear guidelines on how to do this.

I understand that we cannot use the existing management interface and that we cannot use the same subnet we use for the management.

So we just pick another interface , find a different subnet and patch this other interface to a switch ?. So that's two interfaces (1 for active and 1 for standby) ?.

If so what purpose does that serve as you still need to patch both interfaces on the firewall - so just consuming interfaces to replicate the management interface ?

So just looking for some really good configuration guidelines - not the Fortinet docos they are useless and do not explain it well enough.

Regards

sjoshi

Staff

Hi @gokiwi64

When you have enabled dedicated HA mgmt interface under HA config then both the FortiGate Active and Slave can be access at same time.

Another use case can be when you have syslog and want to sent logs of both device to the logging device then dedicated ha mgmt interface can be used to sent the logs since both will have separate IP address

Thanks, Salon

msanjaypadma

Staff

Hi @gokiwi64 ,

You can use the same MGMT interface for HA management interface as well. If the interface is not showing might be it has few reference.

You can refer this below article , any doubt in this can help you further.

Thanks,
Mayur Padma

Thanks, Mayur Padma

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