Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Networks Using Entropy Labels (ELs)
RFC 8012

Document Type RFC - Proposed Standard (November 2016; No errata)
Updates RFC 6790
Last updated 2016-11-07
Replaces draft-akiya-mpls-entropy-lsp-ping
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
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IESG IESG state RFC 8012 (Proposed Standard)
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Internet Engineering Task Force (IETF)                          N. Akiya
Request for Comments: 8012                           Big Switch Networks
Updates: 6790                                                 G. Swallow
Category: Standards Track                                   C. Pignataro
ISSN: 2070-1721                                                    Cisco
                                                                A. Malis
                                                     Huawei Technologies
                                                               S. Aldrin
                                                                  Google
                                                           November 2016

        Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace
             over MPLS Networks Using Entropy Labels (ELs)

Abstract

   Multiprotocol Label Switching (MPLS) Label Switched Path (LSP) ping
   and traceroute are methods used to test Equal-Cost Multipath (ECMP)
   paths.  Ping is known as a connectivity-verification method and
   traceroute is known as a fault-isolation method, as described in RFC
   4379.  When an LSP is signaled using the Entropy Label (EL) described
   in RFC 6790, the ability for LSP ping and traceroute operations to
   discover and exercise ECMP paths is lost for scenarios where Label
   Switching Routers (LSRs) apply different load-balancing techniques.
   One such scenario is when some LSRs apply EL-based load balancing
   while other LSRs apply load balancing that is not EL based (e.g.,
   IP).  Another scenario is when an EL-based LSP is stitched with
   another LSP that can be EL based or not EL based.

   This document extends the MPLS LSP ping and traceroute multipath
   mechanisms in RFC 6424 to allow the ability of exercising LSPs that
   make use of the EL.  This document updates RFC 6790.

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
   http://www.rfc-editor.org/info/rfc8012.

Akiya, et al.                Standards Track                    [Page 1]
RFC 8012                  LSP Ping over Entropy            November 2016

Copyright Notice

   Copyright (c) 2016 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
   (http://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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................5
           1.1.1. Requirements Language ...............................6
      1.2. Background .................................................6
   2. Multipath Type {9} ..............................................7
   3. Pseudowire Tracing ..............................................7
   4. Entropy Label FEC ...............................................8
   5. DS Flags: L and E ...............................................9
   6. New Multipath Information Type {10} ............................10
   7. Initiating LSR Procedures ......................................12
   8. Responder LSR Procedures .......................................14
      8.1. IP-Based Load Balancer That Does Not Push ELI/EL ..........15
      8.2. IP-Based Load Balancer That Pushes ELI/EL .................15
      8.3. Label-Based Load Balancer That Does Not Push ELI/EL .......16
      8.4. Label-Based Load Balancer That Pushes ELI/EL ..............17
      8.5. Flow-Aware MS-PW Stitching LSR ............................18
   9. Supported and Unsupported Cases ................................18
   10. Security Considerations .......................................20
   11. IANA Considerations ...........................................21
      11.1. Entropy Label FEC ........................................21
      11.2. DS Flags .................................................21
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