Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces
RFC 7130
| Document | Type |
RFC - Proposed Standard
(February 2014; No errata)
Was draft-ietf-bfd-on-lags (bfd WG)
|
|
|---|---|---|---|
| Last updated | 2018-12-20 | ||
| Replaces | draft-mmm-bfd-on-lags | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication (wg milestone: Nov 2013 - Submit the BFD over ... ) | |
| Document shepherd | Nobo Akiya | ||
| Shepherd write-up | Show (last changed 2013-11-12) | ||
| IESG | IESG state | RFC 7130 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Adrian Farrel | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) M. Bhatia, Ed.
Request for Comments: 7130 Alcatel-Lucent
Category: Standards Track M. Chen, Ed.
ISSN: 2070-1721 Huawei Technologies
S. Boutros, Ed.
M. Binderberger, Ed.
Cisco Systems
J. Haas, Ed.
Juniper Networks
February 2014
Bidirectional Forwarding Detection (BFD) on
Link Aggregation Group (LAG) Interfaces
Abstract
This document defines a mechanism to run Bidirectional Forwarding
Detection (BFD) on Link Aggregation Group (LAG) interfaces. It does
so by running an independent Asynchronous mode BFD session on every
LAG member link.
This mechanism allows the verification of member link continuity,
either in combination with, or in absence of, Link Aggregation
Control Protocol (LACP). It provides a shorter detection time than
what LACP offers. The continuity check can also cover elements of
Layer 3 (L3) bidirectional forwarding.
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/rfc7130.
Bhatia, et al. Standards Track [Page 1]
RFC 7130 BFD for LAG Interfaces February 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. 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. BFD on LAG Member Links . . . . . . . . . . . . . . . . . . . 3
2.1. Micro-BFD Session Address Family . . . . . . . . . . . . 4
2.2. Micro-BFD Session Negotiation . . . . . . . . . . . . . . 4
2.3. Micro-BFD Session Ethernet Details . . . . . . . . . . . 5
3. Interaction between LAG and BFD . . . . . . . . . . . . . . . 6
4. BFD on LAG Member Links and L3 Applications . . . . . . . . . 6
5. Detecting a Member Link Failure . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
10.1. Normative References . . . . . . . . . . . . . . . . . . 9
10.2. Informative References . . . . . . . . . . . . . . . . . 9
Appendix A. Considerations When Using BFD on Member Links . . . 10
1. Introduction
The Bidirectional Forwarding Detection (BFD) protocol [RFC5880]
provides a mechanism to detect faults in the bidirectional path
between two forwarding engines, including interfaces, data links, and
to the extent possible the forwarding engines themselves, with
potentially very low latency. The BFD protocol also provides a fast
mechanism for detecting communication failures on any data links and
the protocol can run over any media and at any protocol layer.
LAG, as defined in [IEEE802.1AX], provides mechanisms to combine
multiple physical links into a single logical link. This logical
link provides higher bandwidth and better resiliency, because if one
Bhatia, et al. Standards Track [Page 2]
RFC 7130 BFD for LAG Interfaces February 2014
of the physical member links fails, the aggregate logical link can
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