The analysis of SRv6 and potential improvement
draft-yan-rtgwg-srv6-constrain-analysis-00

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INTERNET-DRAFT                                                  Shen Yan
Intended Status: Informational                                  Zhe Chen
Expires: January 3, 2019                             Huawei Technologies
                                                            July 2, 2018

             The analysis of SRv6 and potential improvement
               draft-yan-rtgwg-srv6-constrain-analysis-00

Abstract

   This document analyzes the constrains of Segment Routing (SR),
   especially in the aspect of the header consumption and multicast of
   SRv6. Some potential methods have been proposed to improve the
   performance and enable more functions. 

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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Copyright and License Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
 

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   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Constrain Analysis . . . . . . . . . . . . . . . . . . . . . .  3
     3.1  Segment Consumption . . . . . . . . . . . . . . . . . . . .  3
     3.2  Multicast . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4  Potential Improvement . . . . . . . . . . . . . . . . . . . . .  5
     4.1  Decrease the Consumption  . . . . . . . . . . . . . . . . .  5
     4.2  Globalize Semantics . . . . . . . . . . . . . . . . . . . .  6
   5  Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   6  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   7  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     7.1  Normative References  . . . . . . . . . . . . . . . . . . .  7
     7.2  Informative References  . . . . . . . . . . . . . . . . . .  8
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  8

 

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1  Introduction

   Segment Routing (SR) leverages the source routing paradigm. It allows
   a headend node to steer a packet flow along any path for specific
   objectives like Traffic Engineering (TE). A node steers a packet
   through an SR Policy instantiated as an ordered list of instructions.
   These instructions are stack-structural and Segment Routing can be
   directly instantiated on the IPv6 data plane through the use of the
   Segment Routing Header defined in [I-D.ietf-6man-segment-routing-
   header]. SRv6 refers to this SR instantiation on the IPv6 data plane.
   The current SRv6's design is good however there are still some
   constrains in SID consumption and functional defects. 

   In this document, we analyze the constrains of SRv6's design and try
   to propose the potential improvement methods. 

2  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

3.  Constrain Analysis

3.1  Segment Consumption

   The SID of SRv6 is a LOC:FUNCT tuple where FUNCT is a locally defined
   label. If a router is required to forward the packet to a specific
   neighbor, or perform a specific function, a corresponding label/SID
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