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Common Interval Support in Bidirectional Forwarding Detection (RFC7419)

IP.com Disclosure Number: IPCOM000240100D
Original Publication Date: 2014-Dec-01
Included in the Prior Art Database: 2015-Jan-01
Document File: 16 page(s) / 17K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Akiya: AUTHOR [+3]


The Bidirectional Forwarding Detection (BFD) standard [RFC5880] describes how to calculate the transmission interval and the detection time. However, it does not make any statement about how to solve a situation where one BFD speaker cannot support the calculated value. In practice, this may not have been a problem as long as software-implemented timers were used and as long as the granularity of such timers was small compared to the interval values being supported, i.e. as long as the error in the timer interval was small compared to 25 percent jitter.

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Internet Engineering Task Force (IETF)                          N. Akiya Request for Comments: 7419                               M. Binderberger Updates: 5880                                              Cisco Systems Category: Informational                                        G. Mirsky ISSN: 2070-1721                                                 Ericsson                                                            December 2014

      Common Interval Support in Bidirectional Forwarding Detection


   Bidirectional Forwarding Detection (BFD) requires that messages be    transmitted at regular intervals and provides a way to negotiate the    interval used by BFD peers.  Some BFD implementations may be    restricted to only support several interval values.  When such BFD    implementations speak to each other, there is a possibility of two    sides not being able to find a common value for the interval to run    BFD sessions.

   This document updates RFC 5880 by defining a small set of interval    values for BFD that we call "Common Intervals" and recommends    implementations to support the defined intervals.  This solves the    problem of finding an interval value that both BFD speakers can    support while allowing a simplified implementation as seen for    hardware-based BFD.  It does not restrict an implementation from    supporting more intervals in addition to the Common Intervals.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see 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/rfc7419.

 Akiya, et al.                 Informational                     [Page 1]
 RFC 7419             Common Interval Support in BFD        December 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.ietf.org/license-info) in effect on the date of    publication of this document.  Pl...