Document Type Replaced Internet-Draft (mpls WG)
Authors Xiaohu Xu  , Stewart Bryant  , Adrian Farrel  , Syed Hassan  , Wim Henderickx  , Zhenbin Li 
Last updated 2018-07-31 (latest revision 2018-06-04)
Replaces draft-bryant-mpls-unified-ip-sr, draft-xu-mpls-unified-source-routing-instruction
Replaced by RFC 8663
Stream Internent Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-mpls-sr-over-ip
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


MPLS Segment Routing (SR-MPLS in short) is an MPLS data plane-based source routing paradigm in which the sender of a packet is allowed to partially or completely specify the route the packet takes through the network by imposing stacked MPLS labels on the packet. SR-MPLS could be leveraged to realize a source routing mechanism across MPLS, IPv4, and IPv6 data planes by using an MPLS label stack as a source routing instruction set while preserving backward compatibility with SR-MPLS. This document describes how SR-MPLS capable routers and IP-only routers can seamlessly co-exist and interoperate through the use of SR-MPLS label stacks and IP encapsulation/tunneling such as MPLS-in- UDP as defined in RFC 7510.


Xiaohu Xu (
Stewart Bryant (
Adrian Farrel (
Syed Hassan (
Wim Henderickx (
Zhenbin Li (

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