Label Switched Path (LSP) Ping and Traceroute Multipath Support for Link Aggregation Group (LAG) Interfaces
RFC 8611

Document Type RFC - Proposed Standard (June 2019; No errata)
Updates RFC 8029
Last updated 2019-06-19
Replaces draft-akiya-mpls-lsp-ping-lag-multipath
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
Shepherd write-up Show (last changed 2018-08-03)
IESG IESG state RFC 8611 (Proposed Standard)
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Internet Engineering Task Force (IETF)                          N. Akiya
Request for Comments: 8611                           Big Switch Networks
Updates: 8029                                                 G. Swallow
Category: Standards Track                                           SETC
ISSN: 2070-1721                                             S. Litkowski
                                                             B. Decraene
                                                                  Orange
                                                                J. Drake
                                                        Juniper Networks
                                                                 M. Chen
                                                                  Huawei
                                                               June 2019

    Label Switched Path (LSP) Ping and Traceroute Multipath Support
              for Link Aggregation Group (LAG) Interfaces

Abstract

   This document defines extensions to the MPLS Label Switched Path
   (LSP) Ping and Traceroute mechanisms as specified in RFC 8029.  The
   extensions allow the MPLS LSP Ping and Traceroute mechanisms to
   discover and exercise specific paths of Layer 2 (L2) Equal-Cost
   Multipath (ECMP) over Link Aggregation Group (LAG) interfaces.
   Additionally, a mechanism is defined to enable the determination of
   the capabilities supported by a Label Switching Router (LSR).

   This document updates RFC 8029.

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/rfc8611.

Akiya, et al.                Standards Track                    [Page 1]
RFC 8611                    LSP Ping for LAG                   June 2019

Copyright Notice

   Copyright (c) 2019 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
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   publication of this document.  Please review these documents
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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.  Background  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Overview of Solution  . . . . . . . . . . . . . . . . . . . .   4
   3.  LSR Capability Discovery  . . . . . . . . . . . . . . . . . .   6
     3.1.  Initiator LSR Procedures  . . . . . . . . . . . . . . . .   7
     3.2.  Responder LSR Procedures  . . . . . . . . . . . . . . . .   7
   4.  Mechanism to Discover L2 ECMP . . . . . . . . . . . . . . . .   7
     4.1.  Initiator LSR Procedures  . . . . . . . . . . . . . . . .   7
     4.2.  Responder LSR Procedures  . . . . . . . . . . . . . . . .   8
     4.3.  Additional Initiator LSR Procedures . . . . . . . . . . .  10
   5.  Mechanism to Validate L2 ECMP Traversal . . . . . . . . . . .  11
     5.1.  Incoming LAG Member Links Verification  . . . . . . . . .  11
       5.1.1.  Initiator LSR Procedures  . . . . . . . . . . . . . .  11
       5.1.2.  Responder LSR Procedures  . . . . . . . . . . . . . .  12
       5.1.3.  Additional Initiator LSR Procedures . . . . . . . . .  12
     5.2.  Individual End-to-End Path Verification . . . . . . . . .  14
   6.  LSR Capability TLV  . . . . . . . . . . . . . . . . . . . . .  14
   7.  LAG Description Indicator Flag: G . . . . . . . . . . . . . .  15
   8.  Local Interface Index Sub-TLV . . . . . . . . . . . . . . . .  16
   9.  Remote Interface Index Sub-TLV  . . . . . . . . . . . . . . .  17
   10. Detailed Interface and Label Stack TLV  . . . . . . . . . . .  17
     10.1.  Sub-TLVs . . . . . . . . . . . . . . . . . . . . . . . .  19
       10.1.1.  Incoming Label Stack Sub-TLV . . . . . . . . . . . .  19
       10.1.2.  Incoming Interface Index Sub-TLV . . . . . . . . . .  20
   11. Rate-Limiting on Echo Request/Reply Messages  . . . . . . . .  21
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  21
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