BFD Stability
draft-ietf-bfd-stability-02
Network Working Group A. Mishra
Internet-Draft O3b Networks
Intended status: Standards Track M. Jethanandani
Expires: November 26, 2018
A. Saxena
Ciena Corporation
S. Pallagatti
Juniper Networks
M. Chen
Huawei
P. Fan
China Mobile
May 25, 2018
BFD Stability
draft-ietf-bfd-stability-02
Abstract
This document describes extensions to the Bidirectional Forwarding
Detection (BFD) protocol to measure BFD stability. Specifically, it
describes a mechanism for detection of BFD frame loss.
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
Task Force (IETF). Note that other groups may also distribute
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and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 26, 2018.
Mishra, et al. Expires November 26, 2018 [Page 1]
Internet-Draft BFD Stability May 2018
Copyright Notice
Copyright (c) 2018 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. BFD Null-Authentication TLV . . . . . . . . . . . . . . . . . 3
4. Theory of Operations . . . . . . . . . . . . . . . . . . . . 3
4.1. Loss Measurement . . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Security Consideration . . . . . . . . . . . . . . . . . . . 4
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 4
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
9. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
The Bidirectional Forwarding Detection (BFD) [RFC5880] protocol
operates by transmitting and receiving control frames, generally at
high frequency, over the datapath being monitored. In order to
prevent significant data loss due to a datapath failure, the
tolerance for lost or delayed frames in the Detection Time, as
defined in BFD [RFC5880] is set to the smallest feasible value.
This document proposes a mechanism to detect lost frames in a BFD
session in addition to the datapath fault detection mechanisms of
BFD. Such a mechanism presents significant value to measure the
stability of BFD sessions and provides data to the operators for the
cause of a BFD failure.
This document does not propose BFD extension to measure data traffic
loss or delay on a link or tunnel and the scope is limited to BFD
frames.
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2. Use Cases
Legacy BFD cannot detect any BFD frame loss if loss does not last for
dead interval. This draft proposes a method to detect a dropped
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