SR-MPLS over IPv6 satisfies CRH requirements
draft-steinberg-6man-crh-vs-sr-mpls-00

Document Type Active Internet-Draft (individual)
Authors Dirk Steinberg  , Wim Henderickx  , Zhenbin Li  , Weiqiang Cheng  , Daniel Voyer 
Last updated 2020-06-29
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6MAN                                                   D. Steinberg, Ed.
Internet-Draft                             Lapishills Consulting Limited
Intended status: Informational                             W. Henderickx
Expires: December 31, 2020                                         Nokia
                                                                   Z. Li
                                                     Huawei Technologies
                                                                W. Cheng
                                                            China Mobile
                                                                D. Voyer
                                                             Bell Canada
                                                           June 29, 2020

              SR-MPLS over IPv6 satisfies CRH requirements
                 draft-steinberg-6man-crh-vs-sr-mpls-00

Abstract

   SR-MPLS is a mature solution that provides highly scalable traffic
   engineering capabilities in MPLS networks.  This document analyzes
   how SR-MPLS over IP exceeds the capabilities of the CRH, making the
   latter redundant.

Status of This Memo

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   This Internet-Draft will expire on December 31, 2020.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  A Label by any Other Name . . . . . . . . . . . . . . . . . .   2
   3.  An Endpoint is an Endpoint  . . . . . . . . . . . . . . . . .   3
   4.  All Roads Lead to Rome  . . . . . . . . . . . . . . . . . . .   3
   5.  You Can't Manage What You Can't Measure . . . . . . . . . . .   3
   6.  MTU Overhead  . . . . . . . . . . . . . . . . . . . . . . . .   3
   7.  Services  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   8.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   SR-MPLS [RFC8660] is a mature solution that provides highly scalable
   traffic engineering capabilities in MPLS networks.

   By encapsulating the MPLS label stack in an IPv4 or IPv6 [RFC4023],
   or IP+UDP [RFC7510] header, an SR-MPLS policy can seamlessly traverse
   IP-only routers in a network [RFC8663].

   The SR-MPLS control plane can run on top of IPv4 or IPv6.  The latter
   is reminded in [I-D.filsfils-spring-sr-mpls-ipv6-control-plane].

   This document analyzes how SR-MPLS over IP provides all the
   capabilities of CRH [I-D.bonica-6man-comp-rtg-hdr], making CRH
   redundant.

   The analysis shows that the capabilities provided by CRH are in fact
   a subset of the capabilities provided by SR-MPLS over IPv6.

2.  A Label by any Other Name

   [I-D.bonica-6man-comp-rtg-hdr] specifies the encoding of identifiers
   in 16- or 32-bit values and places them in the CRH.  The CRH is to be
   inspected at each node represented by an identifier.

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   SR-MPLS over IP encodes identifiers in 20-bit values within 32 bit
   labels and places them in an in the SR-MPLS or UDP header.

   Because these encodings must translate into an action and a location
   (IPv6 address) there is really no difference between these encodings,
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