6K. Kompella, et al. Layer 2 VPNs over Tunnels. Internet draft (work in progress) draft-kompella-ppvpn-12vp n-02.txt.
7Luca Martini, et al. Encapsulation Methods for Transport of Layer 2 Frames over IP and MPLS Networks. Internet draft (work in progress) draft-martini-12circuit-encap-mpls-04.txt.
8Luca Martini, et al. Transport of Layer 2 Frames over MPLS. Internet draft (work in progress) draft-martini-12circuit-trans-mpls-09.txt.
