BFD Stability
draft-ietf-bfd-stability-06
Network Working Group A. Mishra
Internet-Draft SES
Intended status: Standards Track M. Jethanandani
Expires: January 14, 2021 Kloud Services
A. Saxena
Ciena Corporation
S. Pallagatti
VmWare
M. Chen
Huawei
P. Fan
China Mobile
July 13, 2020
BFD Stability
draft-ietf-bfd-stability-06
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 packet loss.
Status of This Memo
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This Internet-Draft will expire on January 14, 2021.
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Copyright (c) 2020 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. BFD Null-Authentication Type . . . . . . . . . . . . . . . . 3
5. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 3
5.1. Loss Measurement . . . . . . . . . . . . . . . . . . . . 3
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. Security Consideration . . . . . . . . . . . . . . . . . . . 4
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 4
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
10. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
The Bidirectional Forwarding Detection ( BFD) [RFC5880] protocol
operates by transmitting and receiving BFD control packets, generally
at high frequency, over the datapath being monitored. In order to
prevent significant data loss due to a datapath failure, BFD session
detection time as defined in BFD [RFC5880] is set to the smallest
feasible value.
This document proposes a mechanism to detect lost packet 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 any BFD extension to measure data
traffic loss or delay on a link or tunnel and the scope is limited to
BFD packets.
2. Terminology
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] and
RFC 8174 [RFC8174].
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The reader is expected to be familiar with the BFD [RFC5880],
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