Add a Subinterface
Add one or more subinterfaces to a physical, redundant, or port-channel interface.
For the Firepower 4100/9300, you can configure subinterfaces in FXOS for use with container instances; see Add a VLAN Subinterface for Container Instances. These subinterfaces appear in the Firewall Management Center interface list. You can also add subinterfaces in Firewall Management Center, but only on parent interfaces that do not already have subinterfaces defined in FXOS.
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The parent physical interface passes untagged packets. You may not want to pass untagged packets, so be sure not to include the parent interface in your security policy. |
Procedure
| 1 |
Select and click Edit ( |
| 2 |
Enable the parent interface according to Enable the Physical Interface and Configure Ethernet Settings. |
| 3 |
Click . |
| 4 |
On General, set the following parameters: 
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Click OK. |
| 6 |
Click Save. You can now go to and deploy the policy to assigned devices. The changes are not active until you deploy them. |
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Configure the routed or transparent mode interface parameters. See Configure Routed Mode Interfaces or Configure Bridge Group Interfaces. |
) for your Firewall Threat Defense device. The