Segment Routing Generic TLV for MPLS Label Switched Path (LSP) Ping/ Traceroute
draft-nainar-mpls-spring-lsp-ping-sr-generic-sid-00

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Last updated 2019-07-09
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Network Work group                                        N. Nainar, Ed.
Internet-Draft                                         C. Pignataro, Ed.
Intended status: Standards Track                                  Z. Ali
Expires: January 9, 2020                                     C. Filsfils
                                                                   Cisco
                                                            July 8, 2019

  Segment Routing Generic TLV for MPLS Label Switched Path (LSP) Ping/
                               Traceroute
          draft-nainar-mpls-spring-lsp-ping-sr-generic-sid-00

Abstract

   RFC8402 introduces Segment Routing architecture that leverages source
   routing and tunneling paradigms and can be directly applied to the
   Multi Protocol Label Switching (MPLS) data plane.  A node steers a
   packet through a controlled set of instructions called segments, by
   prepending the packet with Segment Routing header.  SR architecture
   defines different types of segments with different forwarding
   semantics associated.  SR can be applied to the MPLS directly and to
   IPv6 dataplane using a new routing header.

   RFC8287 defines the extensions to MPLS LSP Ping and Traceroute for
   Segment Routing IGP-Prefix and IGP-Adjacency Segment Identifier
   (SIDs) with an MPLS data plane.  Various SIDs are proposed as part of
   SR architecture with different associated instructions that raises a
   need to come up with new Target FEC Stack Sub-TLV for each such SIDs.

   This document defines a new Target FEC Stack Sub-TLV that is used to
   validate the instruction associated with any SID.

Status of This Memo

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   This Internet-Draft will expire on January 9, 2020.

Nainar, et al.           Expires January 9, 2020                [Page 1]
Internet-Draft   SR Generic TLV for MPLS LSP Ping/Trace        July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Challenges with Existing Mechanism  . . . . . . . . . . .   3
   2.  Requirements notation . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Target FEC Stack sub-TLV for Segment Routing SID  . . . . . .   4
     4.1.  Segment Routing Generic Label . . . . . . . . . . . . . .   4
     4.2.  FEC for Path validation . . . . . . . . . . . . . . . . .   4
   5.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  SID to Interface Mapping  . . . . . . . . . . . . . . . .   5
     5.2.  Initiator behavior  . . . . . . . . . . . . . . . . . . .   6
       5.2.1.  SRGL in Target FEC Stack TLV  . . . . . . . . . . . .   6
     5.3.  Responder behavior  . . . . . . . . . . . . . . . . . . .   7
     5.4.  PHP flag behavior . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   [RFC8402] introduces and describes a Segment Routing architecture
   that leverages the source routing and tunneling paradigms.  A node
   steers a packet through a controlled set of instructions called
   segments, by prepending the packet with Segment Routing header.  A
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