topic Re: Management interface for logical FTD on Firepower 4100 in Network Security

Management interface for logical FTD on Firepower 4100

DavideRanalli97851 — Fri, 12 Mar 2021 18:27:29 GMT

Hi,

I'll shortly have to deploy a physical firepower of the 4100 family "4115".

I know that the first MGMT interface showing up is for chassis FXOS purpuses. In Cisco videos I've seen that the management interface used for FTD "logical instance" is the ethernet1/1 .

1) I am right on saying that management interface for FTD can be any of the interfaces available on the fixed module?

2) On FTD can I use a subinterface as management (and FMC use that same subinterface), or management interface must be physical?

3) Management interface on FTD, can also work as data interface? (for example as mgmt interface i use the once facing as server in a DMZ)

Unfortunately on my virtual lab I couldn't test these things

Thank you in advanced

Re: Management interface for logical FTD on Firepower 4100

Marvin Rhoads — Sat, 13 Mar 2021 12:13:06 GMT

Yes - you must use a separate dedicated physical interface for management. Firepower Chassis Manager will not allow you do deploy an FTD logical devices without having that configured and available.

Re: Management interface for logical FTD on Firepower 4100

DavideRanalli97851 — Sun, 14 Mar 2021 07:37:46 GMT

Thanks Marvin,

so i must first define a management interface, for example eth1/1, then I can create the FTD logical device and apply eth1/1 to it, but can that eth1/1 interface be used for both data and management or does it have to be used exclusively for managemet?

thanks

David

Re: Management interface for logical FTD on Firepower 4100

Marvin Rhoads — Sun, 14 Mar 2021 10:15:35 GMT

While we note that the documentation for Firepower 6.7 says that you can "manage the FTD using a data interface instead of the Management interface", I know that, at least through the latest FXOS for a 4100 or 9300 series, you cannot deploy an FTD logical device without first designating one of the network interfaces as exclusively management (not data). Note that the guide tells us explicitly:

"You can later enable management from a data interface; but you must assign a Management interface to the logical device even if you don't intend to use it after you enable data management. See the configure network management-data-interface command in the FTD command reference for more information."

Reference: https://www.cisco.com/c/en/us/td/docs/security/firepower/fxos/fxos291/web-guide/b_GUI_FXOS_ConfigGuide_291/logical_devices.html#task_4D51AFC7091E4D8F8289F08C6A071459

Re: Management interface for logical FTD on Firepower 4100

DavideRanalli97851 — Sun, 14 Mar 2021 19:32:15 GMT

Fantastic thanks Marvin, you couldn't be clearer than this

Re: Management interface for logical FTD on Firepower 4100

m-abutaleb — Thu, 08 Jan 2026 21:21:50 GMT

Does the management interface have to be connected or not?
Because I am trying to add the FTD inside FXOS, but when I enter the CLI and run:

the device keeps doing a reload.
and the dashboard for FXOS , the Roman version is exciting also , is normal
4100

Re: Management interface for logical FTD on Firepower 4100

Marvin Rhoads — Fri, 09 Jan 2026 15:45:12 GMT

@m-abutaleb please create a new discussion and provide more details on your specific situation. The thread you are replying to is almost 5 years old.

Re: Management interface for logical FTD on Firepower 4100

m-abutaleb — Fri, 09 Jan 2026 18:31:44 GMT

I will explain my question again.

I am trying to add an FTD 4100 to FXOS, but I am only connected back-to-back on the management port, and I did not connect the interface that should be dedicated for the FTD.
I configured that interface type as Management, but it is not connected to the core switch.

So when I try to run:

from FXOS to connect to the FTD, I cannot connect.

My question is:
Does the FTD Management port have to be physically connected to the core switch for this to work?

Re: Management interface for logical FTD on Firepower 4100

Marvin Rhoads — Mon, 12 Jan 2026 14:32:53 GMT

No it does not need to be physically connected to anything for it to initialize. However you may have done other things during your testing that would cause it to fail. It's hard to say what given the limited information you have provided. Generally, the document you would follow for reimaging FTD is this one: https://www.cisco.com/c/en/us/td/docs/security/firepower/2100/troubleshoot_fxos/b_2100_CLI_Troubleshoot/b_2100_CLI_Troubleshoot_chapter_011.html