%% You should probably cite rfc4023 instead of this I-D. @techreport{ietf-mpls-in-ip-or-gre-08, number = {draft-ietf-mpls-in-ip-or-gre-08}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-mpls-in-ip-or-gre/08/}, author = {Eric C. Rosen and Tom Worster and Yakov Rekhter}, title = {{Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE)}}, pagetotal = 14, year = 2004, month = jun, day = 23, abstract = {Various applications of MPLS make use of label stacks with multiple entries. In some cases, it is possible to replace the top label of the stack with an IP-based encapsulation, thereby enabling the application to run over networks that do not have MPLS enabled in their core routers. This document specifies two IP-based encapsulations: MPLS-in-IP and MPLS-in-GRE (Generic Routing Encapsulation). Each of these is applicable in some circumstances. {[}STANDARDS-TRACK{]}}, }