Let’s look at several ways to route between VLANs in the Cisco world. Router on a Stick (ROAS) A router is connected to a switch. If separate VLANs on separate IP subnets wantto talk to each other, they have to go through the router. The router has a VLANtrunk to the switch. The router itself needs an IP address in every VLAN itroutes. These IP addresses are the default routes for the end hosts. On the router, you create subinterfaces by putting a .<n> after the interfacetype and number, wh...
