Interconnecting Millions of Endpoints with Segment Routing
RFC 8604

Document Type RFC - Informational (June 2019; No errata)
Last updated 2019-06-17
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Independent Submission                                  C. Filsfils, Ed.
Request for Comments: 8604                           Cisco Systems, Inc.
Category: Informational                                       S. Previdi
ISSN: 2070-1721                                      Huawei Technologies
                                                           G. Dawra, Ed.
                                                                LinkedIn
                                                           W. Henderickx
                                                                   Nokia
                                                               D. Cooper
                                                             CenturyLink
                                                               June 2019

       Interconnecting Millions of Endpoints with Segment Routing

Abstract

   This document describes an application of Segment Routing to scale
   the network to support hundreds of thousands of network nodes, and
   tens of millions of physical underlay endpoints.  This use case can
   be applied to the interconnection of massive-scale Data Centers (DCs)
   and/or large aggregation networks.  Forwarding tables of midpoint and
   leaf nodes only require a few tens of thousands of entries.  This may
   be achieved by the inherently scaleable nature of Segment Routing and
   the design proposed in this document.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not candidates for any level of Internet Standard;
   see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8604.

Filsfils, et al.              Informational                     [Page 1]
RFC 8604               Large-Scale Segment Routing             June 2019

Copyright Notice

   Copyright (c) 2019 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. Reference Design ................................................3
   4. Control Plane ...................................................5
   5. Illustration of the Scale .......................................5
   6. Design Options ..................................................6
      6.1. Segment Routing Global Block (SRGB) Size ...................6
      6.2. Redistribution of Routes for Agg Nodes .....................7
      6.3. Sizing and Hierarchy .......................................7
      6.4. Local Segments to Hosts/Servers ............................7
      6.5. Compressed SRTE Policies ...................................7
   7. Deployment Model ................................................8
   8. Benefits ........................................................8
      8.1. Simplified Operations ......................................8
      8.2. Inter-domain SLAs ..........................................8
      8.3. Scale ......................................................9
      8.4. ECMP .......................................................9
   9. IANA Considerations .............................................9
   10. Manageability Considerations ...................................9
   11. Security Considerations ........................................9
   12. Informative References .........................................9
   Acknowledgements ..................................................10
   Contributors ......................................................10
   Authors' Addresses ................................................11

Filsfils, et al.              Informational                     [Page 2]
RFC 8604               Large-Scale Segment Routing             June 2019

1.  Introduction

   This document describes how Segment Routing (SR) can be used to
   interconnect millions of endpoints.

2.  Terminology

   The following terms and abbreviations are used in this document:

      Term          Definition
      -------------------------------------------------------------
      Agg           Aggregation
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