Configure ASA VLAN Subinterfaces

Step 1

In the left pane, click Inventory.

Step 2

Click the ASA tab.

Step 3

Select the device you want to modify, and in the Management pane on the right, click Interfaces.

Step 4

You can add a subinterface using one of the following methods:

Choose > Subinterface
Click a physical interface that you want to configure and in the Actions pane on the right, click New Subinterface.

Step 5

In the VLAN ID field, enter the VLAN ID between 1 and 4094.

Some VLAN IDs might be reserved on connected switches, so check the switch documentation for more information. For multiple context mode, you can only set the VLAN in the system configuration.

Step 6

In the Subinterface ID field, enter the subinterface ID as an integer between 1 and 4294967293.

The number of subinterfaces allowed depends on your platform. You cannot change the ID after you set it.

Step 7

Continue with one of the following procedures:

Configure IPv4 Address for the subinterface if you intend to assign an IPv4 address to this interface.
Configure IPv6 Address for the subinterface if you intend to assign an IPv6 address to this interface.
Configure Advanced ASA subinterface. The advanced settings have defaults that are appropriate for most networks. Edit them only if you are resolving network issues.
If you saved the subinterface, and you don't want to continue advanced subinterface options, continue to Enable the Subinterface.

Configure ASA VLAN Subinterfaces

Procedure