Label Switched Path (LSP) Ping/Traceroute for Segment Routing Networks with MPLS Data-plane
draft-ietf-mpls-spring-lsp-ping-06

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-08-21
Replaces draft-kumarkini-mpls-spring-lsp-ping
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Network Work group                                         N. Kumar, Ed.
Internet-Draft                                         C. Pignataro, Ed.
Intended status: Standards Track                                   Cisco
Expires: February 22, 2018                                    G. Swallow
                                                              Individual
                                                                N. Akiya
                                                     Big Switch Networks
                                                                 S. Kini
                                                              Individual
                                                                 M. Chen
                                                                  Huawei
                                                         August 21, 2017

 Label Switched Path (LSP) Ping/Traceroute for Segment Routing Networks
                          with MPLS Data-plane
                   draft-ietf-mpls-spring-lsp-ping-06

Abstract

   Segment Routing architecture leverages the source routing and
   tunneling paradigms and can be directly applied to 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 in LSP with Segment Routing architecture.  This
   document illustrates the problem and describe a mechanism to perform
   LSP Ping and Traceroute on Segment Routing network over 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
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Kumar, et al.           Expires February 22, 2018               [Page 1]
Internet-Draft        LSP Ping/Trace for SR on MPLS          August 2017

   This Internet-Draft will expire on February 22, 2018.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements notation . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Challenges with Existing mechanism  . . . . . . . . . . . . .   4
     4.1.  Path validation in Segment Routing networks . . . . . . .   4
     4.2.  Service Label . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Segment ID sub-TLV  . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  IPv4 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   6
     5.2.  IPv6 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   6
     5.3.  IGP-Adjacency Segment ID  . . . . . . . . . . . . . . . .   7
   6.  Extension to Downstream Detailed Mapping TLV  . . . . . . . .   9
   7.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  FECs in Target FEC Stack TLV  . . . . . . . . . . . . . .  10
     7.2.  FEC Stack Change sub-TLV  . . . . . . . . . . . . . . . .  10
     7.3.  Segment ID POP Operation  . . . . . . . . . . . . . . . .  11
     7.4.  Segment ID Check  . . . . . . . . . . . . . . . . . . . .  11
     7.5.  TTL Consideration for traceroute  . . . . . . . . . . . .  14
   8.  Issues with non-forwarding labels . . . . . . . . . . . . . .  15
   9.  Backward Compatibility with non Segment Routing devices . . .  15
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  New Target FEC Stack Sub-TLVs  . . . . . . . . . . . . .  15
     10.2.  Protocol in Label Stack Sub-TLV of Downstream Detailed
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