Label Switched Path (LSP) Ping/Traceroute for Segment Routing (SR) IGP-Prefix and IGP-Adjacency Segment Identifiers (SIDs) with MPLS Data Planes
RFC 8287

Document Type RFC - Proposed Standard (December 2017; Errata)
Last updated 2018-03-21
Replaces draft-kumarkini-mpls-spring-lsp-ping
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
Shepherd write-up Show (last changed 2017-08-21)
IESG IESG state RFC 8287 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Deborah Brungard
Send notices to Loa Andersson <loa@pi.nu>, draft-ietf-mpls-spring-lsp-ping@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                     N. Kumar, Ed.
Request for Comments: 8287                             C. Pignataro, Ed.
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                               G. Swallow
                                               Southend Technical Center
                                                                N. Akiya
                                                     Big Switch Networks
                                                                 S. Kini
                                                              Individual
                                                                 M. Chen
                                                                  Huawei
                                                           December 2017

   Label Switched Path (LSP) Ping/Traceroute for Segment Routing (SR)
        IGP-Prefix and IGP-Adjacency Segment Identifiers (SIDs)
                         with MPLS Data Planes

Abstract

   A Segment Routing (SR) architecture leverages source routing and
   tunneling paradigms and can be directly applied to the use of a
   Multiprotocol Label Switching (MPLS) data plane.  A node steers a
   packet through a controlled set of instructions called "segments" by
   prepending the packet with an SR header.

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

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc8287.

Kumar, et al.                Standards Track                    [Page 1]
RFC 8287               LSP Ping/Trace for SR-MPLS          December 2017

Copyright Notice

   Copyright (c) 2017 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.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Kumar, et al.                Standards Track                    [Page 2]
RFC 8287               LSP Ping/Trace for SR-MPLS          December 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Coexistence of SR-Capable and Non-SR-Capable Node
           Scenarios . . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Challenges with Existing Mechanisms . . . . . . . . . . . . .   5
     4.1.  Path Validation in Segment Routing Networks . . . . . . .   5
   5.  Segment ID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  IPv4 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   7
     5.2.  IPv6 IGP-Prefix Segment ID  . . . . . . . . . . . . . . .   8
     5.3.  IGP-Adjacency Segment ID  . . . . . . . . . . . . . . . .   9
   6.  Extension to Downstream Detailed Mapping TLV  . . . . . . . .  11
   7.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  FECs in Target FEC Stack TLV  . . . . . . . . . . . . . .  11
     7.2.  FEC Stack Change Sub-TLV  . . . . . . . . . . . . . . . .  12
     7.3.  Segment ID POP Operation  . . . . . . . . . . . . . . . .  13
     7.4.  Segment ID Check  . . . . . . . . . . . . . . . . . . . .  13
     7.5.  TTL Consideration for Traceroute  . . . . . . . . . . . .  19
   8.  Backward Compatibility with Non-SR Devices  . . . . . . . . .  19
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
     9.1.  New Target FEC Stack Sub-TLVs . . . . . . . . . . . . . .  20
     9.2.  Protocol in the Segment ID Sub-TLV  . . . . . . . . . . .  20
Show full document text