Step 3 (Optional) Disable switch port mode for any of the switch ports (Ethernet1/2 through 1/8) by clicking the
slider in the SwitchPort column so it shows as disabled ( ).
Step 4 Enable the switch ports.
a) Click the Edit ( ) for the switch port.
b) Enable the interface by checking the Enabled check box.
c) (Optional) Change the VLAN ID; the default is 1. You will next add a VLAN interface to match this ID.
d) Click OK.
Step 5 Add the inside VLAN interface.
a) Click Add Interfaces > VLAN Interface.
The General tab appears.
Cisco Firepower 1010 Getting Started Guide
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Firepower Threat Defense Deployment with FMC
Configure Interfaces (6.5 and Later)