Use of Provider Edge to Provider Edge (PE-PE) Generic Routing Encapsulation (GRE) or IP in BGP/MPLS IP Virtual Private Networks
Yakov Rekhter, R. Bonica, Eric Rosen · 2007
This document proposes an automated mechanism for establishing tunnels between provider-edge routers in a VPN, but does not provide an automated mechanism for establishing security associations for these tunnels.Without such a mechanism, this document is not appropriate for publication on the Internet standards track.