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
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