Traditional Inter-VLAN Routing:
Traditional inter-VLANrouting using physicalinterfaces does have alimitation.
As the number of VLANsincreases on a network, thephysical approach of having one router interface per VLAN quickly becomes hindered by the physical hardware limitations of a router.
Routers have a limited number of physical interfaces that they can use to connect to different VLANs.
It is very expensive to add an Ethernet Interface.