The Route Switch Feature Card (RSFC) is a router feature card for the Catalyst 5000 series Supervisor Engine II G and Supervisor Engine III G modules. The RSFC runs Cisco IOS router software and directly interfaces to the Catalyst switch backplane to provide interVLAN routing.The RSFC contains no physical interfaces. InterVLAN routing is accomplished using virtual interfaces that correspond one-to-one with the VLANs configured on the switch. For example, if you configure VLAN 100 on the switch, you can configure an RSFC interface in that VLAN by creating interface vlan100.