Using One-Arm BFD in Cloud Network
draft-wang-bfd-one-arm-use-case-00

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Last updated 2019-11-18
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BFD Working Group                                                R. Wang
Internet-Draft                                                  W. Cheng
Intended status: Informational                              China Mobile
Expires: May 21, 2020                                            Y. Zhao
                                                                  A. Liu
                                                                     ZTE
                                                       November 18, 2019

                   Using One-Arm BFD in Cloud Network
                   draft-wang-bfd-one-arm-use-case-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 to reduce the device
   requirement for BFD.  One-Arm BFD this draft descripted supports
   another BFD detecting function rather than the echo as described in
   [RFC5880] [RFC5881], it needs nothing BFD capability to one of the
   devices deployed BFD detecting.  Using One-Arm BFD function, the one
   device works on BFD detecting normally and the other device just
   loopback the BFD packets like echo function.  One-Arm BFD is suitable
   for the cloud virtualization network, the One-Arm BFD is deploy on
   NFV gateways, and NFV virtual machine vNICs just enable the echo/
   loopback process.

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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   This Internet-Draft will expire on May 21, 2020.

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Internet-Draft     Using One-Arm BFD in Cloud Network      November 2019

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  One-Arm BFD Use Case  . . . . . . . . . . . . . . . . . . . .   3
   3.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   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
   the device requirement for BFD.  BFD echo function is used when two
   devices are connected but only one of them supports full BFD
   capability.  When the echo function is activated, the local system
   sends a BFD control packet and the remote system loops back the

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