IP over Ethernet (IPoE) Session Health Checking
draft-patterson-intarea-ipoe-health-05

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Last updated 2018-10-01
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intarea                                                     R. Patterson
Internet-Draft                                                    Sky UK
Intended status: Standards Track                          M. Abrahamsson
Expires: April 4, 2019                                         T-Systems
                                                        October 01, 2018

            IP over Ethernet (IPoE) Session Health Checking
                 draft-patterson-intarea-ipoe-health-05

Abstract

   PPP over Ethernet clients have the functionality to detect path
   unavailability by using PPP Keepalives.  IP over Ethernet does not
   have this functionality, and it is not specified in the IETF when an
   IP over Ethernet client should consider its WAN connectivity down,
   unless there is a physical layer link down event.

   This document describes a mechanism for IP over Ethernet clients to
   achieve connectivity validation, similar to that of PPP over
   Ethernet, by using BFD Echo, or an alternative health check
   mechanism.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 4, 2019.

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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of

Patterson & Abrahamsson   Expires April 4, 2019                 [Page 1]
Internet-Draft                 IPoE-Health                  October 2018

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Alternative Mitigations . . . . . . . . . . . . . . . . . . .   4
   3.  IPoE Health Checks  . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Parameters  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Startup . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  BFD Echo  . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  IPoE Health Check Probe . . . . . . . . . . . . . . . . .   5
   4.  IPoE Health Check DHCP Options  . . . . . . . . . . . . . . .   6
     4.1.  DHCPv6  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  DHCPv4  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Recovery Behaviour  . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  LAN Considerations  . . . . . . . . . . . . . . . . . . .   9
   6.  Multihomed Clients  . . . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   10. Appendix A. Changes from -00  . . . . . . . . . . . . . . . .  10
   11. Appendix B. Changes from -01  . . . . . . . . . . . . . . . .  10
   12. Appendix C. Changes from -02  . . . . . . . . . . . . . . . .  10
   13. Appendix D. Changes from -03  . . . . . . . . . . . . . . . .  11
   14. Appendix E. Changes from -04  . . . . . . . . . . . . . . . .  11
   15. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     15.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     15.2.  Informative References . . . . . . . . . . . . . . . . .  12
     15.3.  URIs . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   PPP [RFC1661] makes use of regular LCP echos and replies to
   continually test the data link layer, if the peer fails to respond to
   a predetermined number of LCP echos, the PPP session is terminated
   and will return to the Link Dead phase, ready for reestablishing.
   IPoE currently lacks this functionality.
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