Internet Engineering Task Force (IETF)                  C. Filsfils, Ed.
Request for Comments: 8355                               S. Previdi, Ed.
Category: Informational                              Cisco Systems, Inc.
ISSN: 2070-1721                                              B. Decraene
                                                                  Orange
                                                               R. Shakir
                                                                  Google
                                                              March 2018


                          Resiliency Use Cases
        in Source Packet Routing in Networking (SPRING) Networks

Abstract

   This document identifies and describes the requirements for a set of
   use cases related to Segment Routing network resiliency on Source
   Packet Routing in Networking (SPRING) networks.

Status of This Memo

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

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are 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/rfc8355.

















Filsfils, et al.              Informational                     [Page 1]

RFC 8355               SPRING Resiliency Use Cases            March 2018


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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Path Protection . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Management-Free Local Protection  . . . . . . . . . . . . . .   6
     3.1.  Management-Free Bypass Protection . . . . . . . . . . . .   7
     3.2.  Management-Free Shortest-Path-Based Protection  . . . . .   8
   4.  Managed Local Protection  . . . . . . . . . . . . . . . . . .   8
     4.1.  Managed Bypass Protection . . . . . . . . . . . . . . . .   9
     4.2.  Managed Shortest Path Protection  . . . . . . . . . . . .   9
   5.  Loop Avoidance  . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Coexistence of Multiple Resilience Techniques in the Same
       Infrastructure  . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   9.  Manageability Considerations  . . . . . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .