Network Working Group M. Bhatia, Ed.
Internet-Draft Alcatel-Lucent
Intended status: Standards Track M. Chen, Ed.
Expires: October 13, 2013 Huawei Technologies
S. Boutros, Ed.
M. Binderberger, Ed.
Cisco Systems
J. Haas, Ed.
Juniper Networks
April 11, 2013
Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG)
Interfaces
draft-mmm-bfd-on-lags-07
Abstract
This document proposes a mechanism to run 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, LACP. It provides a
shorter detection time than what LACP offers. The continuity check
can also cover elements of layer 3 bidirectional forwarding.
This mechanism utilizes a well-known UDP port distinct from that of
single-hop BFD over IP. This new UDP port removes the ambiguity of
BFD over LAG packets from BFD over single-hop IP.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six months
Bhatia, et al. Expires October 13, 2013 [Page 1]
Internet-Draft BFD for LAG Interfaces April 2013
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
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This Internet-Draft will expire on October 13, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. BFD on LAG member links . . . . . . . . . . . . . . . . . . . 4
2.1. Micro BFD session address family . . . . . . . . . . . . . 5
2.2. Micro BFD session negotiation . . . . . . . . . . . . . . 5
2.3. Micro BFD session Ethernet details . . . . . . . . . . . . 6
3. LAG Management Module . . . . . . . . . . . . . . . . . . . . 6
3.1. Interaction between LAG and BFD . . . . . . . . . . . . . 6
3.2. Handling Exceptions . . . . . . . . . . . . . . . . . . . 7
4. BFD on LAG members and layer-3 applications . . . . . . . . . 8
5. Detecting a member link failure . . . . . . . . . . . . . . . 8
6. Security Consideration . . . . . . . . . . . . . . . . . . . . 8
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9
9. Contributing authors . . . . . . . . . . . . . . . . . . . . . 9
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . . 10
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