maybe specify your question in more details, because:
- captive portal is technology/idea .. it is somehow implemented in FortiAuthenticator, FortiGate and other products
- 201E is what ? I guessed that you might refer to Access Point but I haven't found one, it might be FortiGate
- Fortinet is not a Cisco, however generic ideas and technology parts like RADIUS used to auth users is very similar
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.