You can create firewall interfaces using the firewall service blade setup wizard, or using the Create button in the Configure Firewall Interfaces option of the Firewall menu.
For Firewall Service Blade Setup Wizard:
Right-click the blade, then select Firewall Service Blade Setup Wizard. The Firewall Service Blade Setup Wizard appears.
Click Next till the Configure Firewall Interfaces option, in the left pane, is selected. The Firewall Configuration details appear in the right pane.
Click Create.
For Firewall menu:
Right-click the device, then select Configure Firewall Interface(s). The firewall interface details are displayed.
Click Create.
The following information appears:
Number assigned to the VLAN.
Name of the firewall interface.
Security level of the interface.
IP address assigned to the VLAN.
Subnet mask of the VLAN IP address.