Generic Application of Bidirectional Forwarding Detection (BFD)
RFC 5882
| Document | Type |
RFC - Proposed Standard
(June 2010; Errata)
Was draft-ietf-bfd-generic (bfd WG)
|
|
|---|---|---|---|
| Last updated | 2016-09-28 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5882 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ross Callon | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) D. Katz
Request for Comments: 5882 D. Ward
Category: Standards Track Juniper Networks
ISSN: 2070-1721 June 2010
Generic Application of Bidirectional Forwarding Detection (BFD)
Abstract
This document describes the generic application of the Bidirectional
Forwarding Detection (BFD) protocol.
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/rfc5882.
Copyright Notice
Copyright (c) 2010 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
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Katz & Ward Standards Track [Page 1]
RFC 5882 Generic Application of BFD June 2010
Table of Contents
1. Introduction ....................................................3
1.1. Conventions Used in This Document ..........................3
2. Overview ........................................................3
3. Basic Interaction between BFD Sessions and Clients ..............4
3.1. Session State Hysteresis ...................................4
3.2. AdminDown State ............................................5
3.3. Hitless Establishment/Reestablishment of BFD State .........5
4. Control Protocol Interactions ...................................6
4.1. Adjacency Establishment ....................................6
4.2. Reaction to BFD Session State Changes ......................7
4.2.1. Control Protocols with a Single Data Protocol .......7
4.2.2. Control Protocols with Multiple Data Protocols ......8
4.3. Interactions with Graceful Restart Mechanisms ..............8
4.3.1. BFD Fate Independent of the Control Plane ...........9
4.3.2. BFD Shares Fate with the Control Plane ..............9
4.4. Interactions with Multiple Control Protocols ..............10
5. Interactions with Non-Protocol Functions .......................10
6. Data Protocols and Demultiplexing ..............................11
7. Multiple Link Subnetworks ......................................11
7.1. Complete Decoupling .......................................12
7.2. Layer N-1 Hints ...........................................12
7.3. Aggregating BFD Sessions ..................................12
7.4. Combinations of Scenarios .................................12
8. Other Application Issues .......................................13
9. Interoperability Issues ........................................13
10. Specific Protocol Interactions (Non-Normative) ................13
10.1. BFD Interactions with OSPFv2, OSPFv3, and IS-IS ..........14
10.1.1. Session Establishment .............................14
10.1.2. Reaction to BFD State Changes .....................14
10.1.3. OSPF Virtual Links ................................15
10.2. Interactions with BGP ....................................15
10.3. Interactions with RIP ....................................15
11. Security Considerations .......................................16
12. References ....................................................16
12.1. Normative References .....................................16
12.2. Informative References ...................................16
Katz & Ward Standards Track [Page 2]
RFC 5882 Generic Application of BFD June 2010
1. Introduction
The Bidirectional Forwarding Detection [BFD] protocol provides a
liveness detection mechanism that can be utilized by other network
components for which their integral liveness mechanisms are either
too slow, inappropriate, or nonexistent. Other documents have
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