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castro8
castro8
New Member
February 10, 2026
Question

Rstp with fortiswitch

Hello,

I have an environment running MSTP on my FortiSwitches. We are adding a new building to this environment, so we want to unify STP across all switches by running RSTP.

My FortiSwitches are currently running MSTP and are managed by a FortiGate. I noticed that the FortiSwitches use two instances within MSTP (0 and 15). We use FortiLink between the Fortinet infrastructure.

I couldn’t find any guide describing the migration process from MSTP to RSTP.

My FortiSwitch models are 124F and 148F, running version 7.4.5.

2 replies

Stephen_G
Staff & Editor
Stephen_G
Staff & Editor
February 13, 2026

Hello castro8, 

 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

 

In the meantime, if anyone else has any ideas, please feel free to contribute!

Regards,
Stephen_G - Fortinet Community Team
funkylicious
SuperUser
funkylicious
SuperUser
February 13, 2026

hi,

i dont think you can switch from MSTP to RSTP. i didnt find such a config option from what ive read but MSTP is backwards compatible with the rest https://docs.fortinet.com/document/fortiswitch/7.4.9/fortiswitchos-administration-guide/364618/support-for-interoperation-with-rapid-per-vlan-rstp-rapid-pvst-or-rpvst 

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