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Setting up Sub Interfaces to connect to multiple VLANs

Have you ever want to setup sub interfaces on your router so that you can connect multiple VLANs on one physical ethernet port?

The easiest way to do this is to setup a trunk port on your switch and connect it to the ethernet port on your router. Since I am fan standard protcols we will use 802.1q as our trunking protocol as opposed to ISL.

interface f0/0.1
encapsulation dot1q <vlan id>