Configure ASA VLAN Subinterfaces

Procedure

Step 1

In the left pane, click Security Devices.

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: