802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. 802.1Q (or dot1q) tunneling is pretty simple…the provider will put a 802.1Q tag on all the frames that it receives from a customer with a unique VLAN tag. By using a different VLAN tag for … Continue reading 802.1Q Tunneling (Q-in-Q) Configuration Example