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MPLS Extension Header Architecture

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Loa Andersson , Jim Guichard , Haoyu Song , Stewart Bryant
Last updated 2022-04-05
Replaced by draft-andersson-mpls-mna-operation-architecture
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-andersson-mpls-mna-operation-architecture
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Extension Headers (EH) carry information on in-network services and functions in an MPLS network. This document describes an architecture for EHs and what actions an EH capable Label Switching Router (LSR) takes when finding or not finding an EH in the packet. Multiprotocol Label Switching (MPLS) is a widely deployed forwarding technology. It uses label stack entries that are pre-pended to either the EH or the ACH which in turn is pre-pended to the payload. The label stack entries are used to identify the forwarding actions by each LSR. Actions may include pushing, swapping or popping the labels, and using the labels to determine the next hop for forwarding the packet. Labels may also be used to establish the context under which the packet is forwarded. The extension headers are carried after the MPLS Label Stack, and the presence of EHs are indicated in the label stack by an Extension Header Indicator (EHI).


Loa Andersson
Jim Guichard
Haoyu Song
Stewart Bryant

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)