05-12-2025 10:21 PM - edited 05-13-2025 06:24 AM
We have a setup with two FTDs running in High Availability (HA) on separate Firepower chassis in a Multi-Instance environment. I'm trying to create a new sub-interface on a port-channel from FMC, but the interface is not appearing in the FMC UI.
A couple of questions I need help with:
Do I need to create the sub-interface from the Firepower Chassis Manager (FCM) first?
If yes, do I need to create the sub-interface on both chassis and then assign it to the FTDs separately?
Will creating and assigning the sub-interface cause any disruption to the existing traffic or HA state?
Any guidance or best practices would be greatly appreciated.
05-13-2025 08:58 AM
What is the appliance model and version of code that you are using?
05-13-2025 02:04 PM
Appliance: FPR-4115
FXOS Software: 2.10(1.207)
FTD Software 7.0.1
05-14-2025 12:58 PM
I believe the information that you are looking for can be obtained here.
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