DHCPv6 Failover Protocol
draft-ietf-dhc-dhcpv6-failover-protocol-06

Document Type Active Internet-Draft (dhc WG)
Last updated 2017-03-07 (latest revision 2017-02-27)
Replaces draft-ietf-dhc-dhcpv6-failover-design
Stream IETF
Intended RFC status Proposed Standard
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Reviews
Stream WG state Submitted to IESG for Publication Apr 2016 Jul 2016
Document shepherd Bernie Volz
Shepherd write-up Show (last changed 2016-11-01)
IESG IESG state RFC Ed Queue
Consensus Boilerplate Yes
Telechat date
Responsible AD Suresh Krishnan
Send notices to "Bernie Volz" <volz@cisco.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
RFC Editor RFC Editor state EDIT
Dynamic Host Configuration (DHC)                            T. Mrugalski
Internet-Draft                                                       ISC
Intended status: Standards Track                              K. Kinnear
Expires: August 31, 2017                                           Cisco
                                                       February 27, 2017

                        DHCPv6 Failover Protocol
               draft-ietf-dhc-dhcpv6-failover-protocol-06

Abstract

   DHCPv6 as defined in "Dynamic Host Configuration Protocol for IPv6
   (DHCPv6)" (RFC3315) does not offer server redundancy.  This document
   defines a protocol implementation to provide DHCPv6 failover, a
   mechanism for running two servers with the capability for either
   server to take over clients' leases in case of server failure or
   network partition.  It meets the requirements for DHCPv6 failover
   detailed in "DHCPv6 Failover Requirements" (RFC7031).

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 August 31, 2017.

Copyright Notice

   Copyright (c) 2017 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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Mrugalski & Kinnear      Expires August 31, 2017                [Page 1]
Internet-Draft          DHCPv6 Failover Protocol           February 2017

   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  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Failover Concepts and Mechanisms  . . . . . . . . . . . . . .   9
     4.1.  Required Server Configuration . . . . . . . . . . . . . .   9
     4.2.  IPv6 Address and Delegable Prefix Allocation  . . . . . .   9
       4.2.1.  Independent Allocation  . . . . . . . . . . . . . . .   9
       4.2.2.  Proportional Allocation . . . . . . . . . . . . . . .  10
     4.3.  Lazy Updates  . . . . . . . . . . . . . . . . . . . . . .  13
     4.4.  Maximum Client Lead Time (MCLT) . . . . . . . . . . . . .  13
       4.4.1.  MCLT example  . . . . . . . . . . . . . . . . . . . .  15
   5.  Message and Option Definitions  . . . . . . . . . . . . . . .  18
     5.1.  Message Framing for TCP . . . . . . . . . . . . . . . . .  18
     5.2.  Failover Message Format . . . . . . . . . . . . . . . . .  18
     5.3.  Messages  . . . . . . . . . . . . . . . . . . . . . . . .  19
       5.3.1.  BNDUPD  . . . . . . . . . . . . . . . . . . . . . . .  19
       5.3.2.  BNDREPLY  . . . . . . . . . . . . . . . . . . . . . .  20
       5.3.3.  POOLREQ . . . . . . . . . . . . . . . . . . . . . . .  20
       5.3.4.  POOLRESP  . . . . . . . . . . . . . . . . . . . . . .  20
       5.3.5.  UPDREQ  . . . . . . . . . . . . . . . . . . . . . . .  20
       5.3.6.  UPDREQALL . . . . . . . . . . . . . . . . . . . . . .  20
       5.3.7.  UPDDONE . . . . . . . . . . . . . . . . . . . . . . .  21
       5.3.8.  CONNECT . . . . . . . . . . . . . . . . . . . . . . .  21
       5.3.9.  CONNECTREPLY  . . . . . . . . . . . . . . . . . . . .  21
       5.3.10. DISCONNECT  . . . . . . . . . . . . . . . . . . . . .  21
       5.3.11. STATE . . . . . . . . . . . . . . . . . . . . . . . .  21
       5.3.12. CONTACT . . . . . . . . . . . . . . . . . . . . . . .  21
     5.4.  Transaction Id  . . . . . . . . . . . . . . . . . . . . .  22
     5.5.  Options . . . . . . . . . . . . . . . . . . . . . . . . .  22
       5.5.1.  OPTION_F_BINDING_STATUS . . . . . . . . . . . . . . .  22
       5.5.2.  OPTION_F_CONNECT_FLAGS  . . . . . . . . . . . . . . .  23
       5.5.3.  OPTION_F_DNS_REMOVAL_INFO . . . . . . . . . . . . . .  24
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