RFC 4023

Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE), March 2005

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Updated by:
RFC 5332
T. Worster
Y. Rekhter
E. Rosen, Ed.
mpls (rtg)

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DOI:  https://doi.org/10.17487/RFC4023

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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]

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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