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Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Networks Using Entropy Labels (ELs) (RFC8012)

IP.com Disclosure Number: IPCOM000248196D
Original Publication Date: 2016-Nov-01
Included in the Prior Art Database: 2016-Nov-08
Document File: 46 page(s) / 50K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Akiya: AUTHOR [+5]


[RFC4379] describes LSP traceroute as an operation where the initiating LSR sends a series of MPLS echo requests towards the same destination. The first packet in the series has the TTL set to 1. When the echo reply is received from the LSR one hop away, the second echo request in the series is sent with the TTL set to 2. For each additional echo request, the TTL is incremented by one until a response is received from the intended destination. The initiating LSR discovers and exercises ECMP by obtaining Multipath Information from each transit LSR and using a specific destination IP address or specific entropy label.

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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)


   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 obtaine...