L2TP Tunneling
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If you need to run a Layer 2 circuit over a Layer 3 network, you can set up an L2TP tunnel. It can be applied to a variety of interfaces:
- VLAN interfaces on L3 switches, allowing it to provide access to all ports on a VLAN
- subinterfaces on routed interfaces on routers, allowing you to constrain it to a particular VLAN
- an entire routed interface on a router, allowing you to trunk VLANs through it.
l2tp-class L2TP-TUNNEL hello 5 password 7 110A1016141D cookie size 8 ! pseudowire-class L2TP-TUNNEL encapsulation l2tpv3 ip local interface Loopback0 ! interface Loopback0 ip address 172.16.5.2 255.255.255.255 ! interface Vlan1 no ip address xconnect 172.16.5.1 1 encapsulation l2tpv3 pw-class L2TP-TUNNEL