Unaffiliated BFD Echo Function
draft-cw-bfd-unaffiliated-echo-00
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BFD Working Group W. Cheng
Internet-Draft R. Wang
Intended status: Informational China Mobile
Expires: September 8, 2020 X. Min
A. Liu
ZTE
March 7, 2020
Unaffiliated BFD Echo Function
draft-cw-bfd-unaffiliated-echo-00
Abstract
Bidirectional Forwarding Detection (BFD) is a fault detection
protocol that can quickly determine a communication failure between
devices and notify upper-layer applications [RFC5880]. BFD has
asynchronous detecting mode and demand detection mode to satisfy
different scenarios, also supports echo function as an adjunct to
both modes to reduce the device requirement for BFD.
Unaffiliated BFD echo function described in this document reuses the
BFD echo function as described in [RFC5880] and [RFC5881], but
independent of BFD asynchronous mode or BFD demand mode, that means
it doesn't need BFD protocol capability of state machine, but only
BFD echo function to a deployed device supporting BFD detection.
When using unaffiliated BFD echo function, just the local device
works on BFD protocol and the BFD peer doesn't, which only loopback
the received BFD echo packets as usual data packets without enabling
BFD protocol.
Section 6.2.2 of [BBF-TR-146] describes one use case of the
unaffiliated BFD echo function, and at least one more use case is
known in the field BFD deployment.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Cheng, et al. Expires September 8, 2020 [Page 1]
Internet-Draft Unaffiliated BFD Echo Function March 2020
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 8, 2020.
Copyright Notice
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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Unaffiliated BFD Echo Behavior . . . . . . . . . . . . . . . 3
3. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
To minimize the impact of device faults on services and improve
network availability, a network device must be able to quickly detect
faults in communication with adjacent devices. Measures can then be
taken to promptly rectify the faults to ensure service continuity.
BFD is a low-overhead, short-duration method to detect faults on the
path between adjacent forwarding engines. The faults can be
interface, data link, and even forwarding engine faults. It is a
single, unified mechanism to monitor any media and protocol layers in
real time.
BFD has asynchronous detecting mode and demand detection mode to
satisfy different scenarios, also supports echo function to reduce
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Internet-Draft Unaffiliated BFD Echo Function March 2020
the device requirement for BFD. When the echo function is activated,
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