Label Switched Path (LSP) Ping/Traceroute for Segment Routing IGP Prefix and Adjacency SIDs with MPLS Data-plane
draft-ietf-mpls-spring-lsp-ping-13

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-11-29 (latest revision 2017-10-17)
Replaces draft-kumarkini-mpls-spring-lsp-ping
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RFC Editor RFC Editor state AUTH48
Network Work group                                         N. Kumar, Ed.
Internet-Draft                                         C. Pignataro, Ed.
Intended status: Standards Track                                   Cisco
Expires: April 20, 2018                                       G. Swallow
                                               Southend Technical Center
                                                                N. Akiya
                                                     Big Switch Networks
                                                                 S. Kini
                                                              Individual
                                                                 M. Chen
                                                                  Huawei
                                                        October 17, 2017

Label Switched Path (LSP) Ping/Traceroute for Segment Routing IGP Prefix
                and Adjacency SIDs with MPLS Data-plane
                   draft-ietf-mpls-spring-lsp-ping-13

Abstract

   A Segment Routing architecture leverages source routing and tunneling
   paradigms and can be directly applied to use of a 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 a Segment Routing header.

   The segment assignment and forwarding semantic nature of Segment
   Routing raises additional consideration for connectivity verification
   and fault isolation for an LSP within a Segment Routing architecture.
   This document illustrates the problem and defines extensions to
   perform LSP Ping and Traceroute for Segment Routing IGP Prefix and
   Adjacency SIDs with an MPLS data plane.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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Kumar, et al.            Expires April 20, 2018                 [Page 1]
Internet-Draft        LSP Ping/Trace for SR on MPLS         October 2017

   This Internet-Draft will expire on April 20, 2018.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Coexistence of SR-Capable and Non-SR-Capable Node
           Scenarios . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements notation . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Challenges with Existing mechanisms . . . . . . . . . . . . .   4
     4.1.  Path validation in Segment Routing networks . . . . . . .   4
   5.  Segment ID sub-TLV  . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  IPv4 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   6
     5.2.  IPv6 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   7
     5.3.  IGP-Adjacency Segment ID  . . . . . . . . . . . . . . . .   8
   6.  Extension to Downstream Detailed Mapping TLV  . . . . . . . .   9
   7.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  FECs in Target FEC Stack TLV  . . . . . . . . . . . . . .  10
     7.2.  FEC Stack Change sub-TLV  . . . . . . . . . . . . . . . .  11
     7.3.  Segment ID POP Operation  . . . . . . . . . . . . . . . .  11
     7.4.  Segment ID Check  . . . . . . . . . . . . . . . . . . . .  11
     7.5.  TTL Consideration for traceroute  . . . . . . . . . . . .  17
   8.  Backward Compatibility with non Segment Routing devices . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
     9.1.  New Target FEC Stack Sub-TLVs . . . . . . . . . . . . . .  18
     9.2.  Protocol in the Segment ID sub-TLV  . . . . . . . . . . .  18
     9.3.  Adjacency Type in the IGP-Adjacency Segment ID  . . . . .  19
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