ASA 5525 Internal-Data0/1

[Andreew]

Hello, 

I have ASA 5525-X and on this ASA is down Internal-Data0/1

Internal-Control0/0 127.0.1.1 YES unset up up
Internal-Data0/0 unassigned YES unset up up
Internal-Data0/1 unassigned YES unset down down
Internal-Data0/2 unassigned YES unset up up

Please can me someone explain or give me some guide about X ASA's what are these Internal-Data interfaces and why can get these interfaces down? 

I do nothing with configuration or physical connections and communication and services on ASA are OK but this interface Internal-Data0/1 is down. 

Thanks 

[Rahul Govindan]

The InternalData interfaces are used as various communication channels with the Firepower services module:

Reference here:

https://www.ciscolive.com/c/dam/r/ciscolive/apjc/docs/2016/pdf/BRKSEC-3055.pdf