DHCPv6 Failover Protocol
draft-ietf-dhc-dhcpv6-failover-protocol-03
Dynamic Host Configuration (DHC) T. Mrugalski
Internet-Draft ISC
Intended status: Standards Track K. Kinnear
Expires: April 16, 2017 Cisco
October 13, 2016
DHCPv6 Failover Protocol
draft-ietf-dhc-dhcpv6-failover-protocol-03
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
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on April 16, 2017.
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Mrugalski & Kinnear Expires April 16, 2017 [Page 1]
Internet-Draft DHCPv6 Failover Protocol October 2016
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 5
3. Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Failover Concepts and Mechanisms . . . . . . . . . . . . . . 8
4.1. Required Server Configuration . . . . . . . . . . . . . . 8
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 . . . . . . . . . . . . . . . . . . . . 14
5. Message and Option Definitions . . . . . . . . . . . . . . . 16
5.1. Message Framing for TCP . . . . . . . . . . . . . . . . . 16
5.2. Failover Message Format . . . . . . . . . . . . . . . . . 16
5.3. Messages . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.1. BNDUPD . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.2. BNDREPLY . . . . . . . . . . . . . . . . . . . . . . 18
5.3.3. POOLREQ . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.4. POOLRESP . . . . . . . . . . . . . . . . . . . . . . 18
5.3.5. UPDREQ . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.6. UPDREQALL . . . . . . . . . . . . . . . . . . . . . . 18
5.3.7. UPDDONE . . . . . . . . . . . . . . . . . . . . . . . 19
5.3.8. CONNECT . . . . . . . . . . . . . . . . . . . . . . . 19
5.3.9. CONNECTREPLY . . . . . . . . . . . . . . . . . . . . 19
5.3.10. DISCONNECT . . . . . . . . . . . . . . . . . . . . . 19
5.3.11. STATE . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3.12. CONTACT . . . . . . . . . . . . . . . . . . . . . . . 19
5.4. Transaction Id . . . . . . . . . . . . . . . . . . . . . 20
5.5. Options . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5.1. OPTION_F_BINDING_STATUS . . . . . . . . . . . . . . . 20
5.5.2. OPTION_F_CONNECT_FLAGS . . . . . . . . . . . . . . . 21
5.5.3. OPTION_F_DNS_REMOVAL_INFO . . . . . . . . . . . . . . 22
5.5.4. OPTION_F_DNS_HOST_NAME . . . . . . . . . . . . . . . 23
5.5.5. OPTION_F_DNS_ZONE_NAME . . . . . . . . . . . . . . . 23
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