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RFC 9790
Title: IANA Registry and Processing Recommendations
for the First Nibble Following a Label Stack
Author: K. Kompella,
S. Bryant,
M. Bocci,
G. Mirsky, Ed.,
L. Andersson,
J. Dong
Status: Standards Track
Stream: IETF
Date: July 2025
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 15
Updates: RFC 4928
I-D Tag: draft-ietf-mpls-1stnibble-13.txt
URL: https://www.rfc-editor.org/info/rfc9790
DOI: 10.17487/RFC9790
This document creates a new IANA registry (called the "Post-Stack
First Nibble" registry) for the first nibble (4-bit field)
immediately following an MPLS label stack. Furthermore, this document
presents some requirements for registering new values and making the
processing of MPLS packets easier and more robust.
The relationship between the IANA "Post-Stack First Nibble" registry
and the "IP Version Numbers" registry (RFC 2780) is described in this
document.
This document updates RFC 4928 by deprecating the heuristic method
for identifying the type of packet encapsulated in MPLS.
This document is a product of the Multiprotocol Label Switching Working Group
of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: 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 Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
memo is unlimited.
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