Encapsulating MPLS in IP or Generic Routing Encapsulation
RFC 4023, “Encapsulating MPLS in IP or Generic Routing Encapsulation”, is a Proposed Standard document published in March 2005 by T. Worster, Y. Rekhter, E. Rosen. It has since been updated by RFC 5332. The canonical text is published by the RFC Editor.
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]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 4023 is hosted at rfc-editor.org. Available in TXT,HTML.
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