8Martini L, Tappan D. Encapsulation methods for transport of layer 2 frames over IP and MPLS networks [ DB/OL ]. http ://ietfreport, isoc. org/idref/draft,martini-12circuit-encap-mpls/, 2004/2005-03-02.
9Martini L, Tappan D. Transport cf layer 2 frames over MPLS[DB/OL]. http.//iethreport, isoc. org/idref/draft-martini-12circuit-trans-mpls/, 2004/2005-02-20.