VRFs are to Layer 3 as VLANs are to Layer 2 and delimit the domain of an IP network within a router. The Cisco website has a more formal definition: VRF–A VPN Routing/Forwarding instance. A VRF ...
interface Vlan11 description Wired Guest subnet ip vrf forwarding guest ip address 172.16.11.2 255.255.255.0 ip helper-address 172.18.2.10 standby 11 ip 172.16.11.1 standby 11 timers msec 250 msec 800 ...