Inter-VLAN Routing
As we all know, VLANs cannot communicate with other VLANs without the help of a router or a layer 3 switch. Usually, hosts on a VLAN will need to speak to other hosts or devices on other VLANs.
To make this possible we need to configure what’s known as Inter-VLAN Routing. Inter-VLAN Routing uses a layer 3 intermediary device such as a Router or a Layer 3 switch to make these communications possible.
Inter-VLAN routing is the process to forward traffic from one VLAN to another VLAN.
Inter-VLAN Routing options
There is a total of 3 different Inter-VLAN Routing solutions
| Legacy Inter-VLAN Routing |
| A solution that is nowadays considered Legacy and is no longer used since it does not scale well. |
| Router on a Stick (ROS) |
| This is a widely used, acceptable solution for a small to medium-sized network |
| Layer 3 Switching (Using switched Virtual Interfaces [SVIs]) |
| This is by far the best and most scalable solution for medium to large networks. |