Bidirectional Forwarding Detection (BFD) for Multipoint Networks
RFC 8562
| Document | Type |
RFC - Proposed Standard
(April 2019; No errata)
Updates RFC 5880
|
|
|---|---|---|---|
| Last updated | 2019-04-02 | ||
| Replaces | draft-katz-ward-bfd-multipoint | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Reshad Rahman | ||
| Shepherd write-up | Show (last changed 2018-03-05) | ||
| IESG | IESG state | RFC 8562 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Martin Vigoureux | ||
| Send notices to | Reshad Rahman <rrahman@cisco.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) D. Katz
Request for Comments: 8562 Juniper Networks
Updates: 5880 D. Ward
Category: Standards Track Cisco Systems
ISSN: 2070-1721 S. Pallagatti, Ed.
VMware
G. Mirsky, Ed.
ZTE Corp.
April 2019
Bidirectional Forwarding Detection (BFD) for Multipoint Networks
Abstract
This document describes extensions to the Bidirectional Forwarding
Detection (BFD) protocol for its use in multipoint and multicast
networks.
This document updates RFC 5880.
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/rfc8562.
Katz, et al. Standards Track [Page 1]
RFC 8562 BFD for Multipoint Networks April 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
Provisions Relating to IETF Documents
(https://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, et al. Standards Track [Page 2]
RFC 8562 BFD for Multipoint Networks April 2019
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Protocol Details . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Multipoint BFD Control Packets . . . . . . . . . . . . . 6
5.2. Session Model . . . . . . . . . . . . . . . . . . . . . . 6
5.3. Session-Failure Semantics . . . . . . . . . . . . . . . . 6
5.4. State Variables . . . . . . . . . . . . . . . . . . . . . 6
5.4.1. New State Variable Values . . . . . . . . . . . . . . 6
5.4.2. State Variable Initialization and Maintenance . . . . 7
5.5. State Machine . . . . . . . . . . . . . . . . . . . . . . 7
5.6. Session Establishment . . . . . . . . . . . . . . . . . . 8
5.7. Discriminators and Packet Demultiplexing . . . . . . . . 8
5.8. Packet Consumption on Tails . . . . . . . . . . . . . . . 9
5.9. Bringing Up and Shutting Down Multipoint BFD Service . . 9
5.10. Timer Manipulation . . . . . . . . . . . . . . . . . . . 10
5.11. Detection Times . . . . . . . . . . . . . . . . . . . . . 10
5.12. State Maintenance for Down/AdminDown Sessions . . . . . . 11
5.12.1. MultipointHead Sessions . . . . . . . . . . . . . . 11
5.12.2. MultipointTail Sessions . . . . . . . . . . . . . . 11
5.13. Base Specification Text Replacement . . . . . . . . . . . 11
5.13.1. Reception of BFD Control Packets . . . . . . . . . . 12
5.13.2. Demultiplexing BFD Control Packets . . . . . . . . . 15
5.13.3. Transmitting BFD Control Packets . . . . . . . . . . 16
6. Congestion Considerations . . . . . . . . . . . . . . . . . . 19
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
8. Security Considerations . . . . . . . . . . . . . . . . . . . 20
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 21
9.1. Normative References . . . . . . . . . . . . . . . . . . 21
9.2. Informative References . . . . . . . . . . . . . . . . . 22
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 22
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 23
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