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Making Route Flap Damping Usable (RFC7196)

IP.com Disclosure Number: IPCOM000236822D
Publication Date: 2014-May-17
Document File: 16 page(s) / 15K

Publishing Venue

The IP.com Prior Art Database

Related People

C. Pelsser: AUTHOR [+5]

Abstract

Route Flap Damping (RFD) was first proposed (see [RIPE178] and [RFC2439]) and subsequently implemented to reduce BGP churn in routers. Unfortunately, RFD was found to severely penalize sites for being well connected because topological richness amplifies the number of update messages exchanged, see [MAO2002]. Subsequently, many operators turned RFD off; see [RIPE378]. Based on the measurements of [PELSSER2011], [RIPE580] now recommends that RFD is usable with some changes to the parameters. Based on the same measurements, this document recommends adjusting a few RFD algorithmic constants and limits. The result is damping of a non- trivial amount of long-term churn without penalizing well-behaved prefixes' normal convergence process.

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Internet Engineering Task Force (IETF)                        C. Pelsser Request for Comments: 7196                                       R. Bush Category: Standards Track                      Internet Initiative Japan ISSN: 2070-1721                                                 K. Patel                                                            Cisco Systems                                                             P. Mohapatra                                                         Sproute Networks                                                               O. Maennel                                                  Loughborough University                                                                 May 2014

                     Making Route Flap Damping Usable

Abstract

   Route Flap Damping (RFD) was first proposed to reduce BGP churn in    routers.  Unfortunately, RFD was found to severely penalize sites for    being well connected because topological richness amplifies the    number of update messages exchanged.  Many operators have turned RFD    off.  Based on experimental measurement, this document recommends    adjusting a few RFD algorithmic constants and limits in order to    reduce the high risks with RFD.  The result is damping a non-trivial    amount of long-term churn without penalizing well-behaved prefixes'    normal convergence process.

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 5741.

   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/rfc7196.

 Pelsser, et al.              Standards Track                    [Page 1]
 RFC 7196            Making Route Flap Damping Usable            May 2014

 Copyright Notice

   Copyright (c) 2014 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....