RFC - 4023

Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE)

Original:	ftp://ftp.isi.edu/in-notes/rfc4023.txt
Authors:	T. Worster [Motorola, Inc.], Y. Rekhter [Juniper Networks, Inc.], E. Rosen [Cisco Systems, Inc.]
Date:	March 2005
Category:	Proposed Standard

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Referred by:	7 RFC
Refers to:	20 RFC

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Status

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2005).

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.

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