Some Cisco firewall users have this kind of confusion regarding about images on Firepower (2100, 4100 or 9300 platforms) and various ASA 5500-FTD-X model platforms; X-elusive FP chassis(9300) & other two platform has FX-OS built-in and on that FTD images which none other than an ASA image with Firepower functionality? In other hand ASA-5500-FTD-X has its own ASA image with FP functionality; If my interpretation is quite wrong what would be core and significant differences between FP and ASA /w FP image; Basically my question is that, from image perspective what's different between them?
Cisco ASA-FTD and FirePower
The appliances 2100, 4100 and 9300 can run either FTD or ASA codes, but not both at the same time. Regardless if they run FTD or ASA, the underlying operating system will always be the FXOS. Through the FXOS supervisor, you can manage the FTD or ASA codes, and configuring the initial settings for the appliances themselves such as physical interfaces, application deployment, traffic distribution, clustering with other appliances etc etc. The FXOS command line is totally different than the ASA or even FTD. FXOS also allows running third party applications such as Radware DDoS which runs in KVM mode on its security modules, on the other side ASA and FTD run in native mode. However, FTD software module on ASA allows the ASA to run its original code, in addition to the FTD software at the same time, from within the ASA you can access to the FTD and install/configure it and then you can redirect the traffic internally from the ASA to the FTD and filter it against the security policies you apply on the FTD module.
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