DHCPv6 Relay Agent Assignment Notification (RAAN) Option
draft-ietf-dhc-dhcpv6-agentopt-delegate-05

Document Type Active Internet-Draft (dhc WG)
Last updated 2017-04-01
Stream IETF
Intended RFC status Proposed Standard
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Network Working Group                                           R. Droms
Internet-Draft
Intended status: Standards Track                                 B. Volz
Expires: October 3, 2017                                   Cisco Systems
                                                                O. Troan
                                                     Cisco Systems, Inc.
                                                           April 1, 2017

        DHCPv6 Relay Agent Assignment Notification (RAAN) Option
             draft-ietf-dhc-dhcpv6-agentopt-delegate-05.txt

Abstract

   The DHCP Relay Agent Assignment Notification (RAAN) option is sent
   from a DHCP server to a DHCP relay agent to inform the relay agent of
   IPv6 addresses that have been assigned or IPv6 prefixes that have
   been delegated to DHCP clients.

Status of This Memo

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   This Internet-Draft will expire on October 3, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Droms, et al.            Expires October 3, 2017                [Page 1]
Internet-Draft    DHCPv6 Assignment Notification Option       April 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language and Terminology . . . . . . . . . . . .   3
   3.  Option Semantics and Usage  . . . . . . . . . . . . . . . . .   3
   4.  Relay Agent Behavior  . . . . . . . . . . . . . . . . . . . .   4
   5.  Server Behavior . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Option Format . . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Encapsulating DHCP Options in the RAAN Option . . . . . . . .   5
     7.1.  IA Address Option . . . . . . . . . . . . . . . . . . . .   5
     7.2.  IA Prefix Option  . . . . . . . . . . . . . . . . . . . .   6
   8.  Requesting Assignment Information from the DHCP Server  . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   6
   11. Changes Log . . . . . . . . . . . . . . . . . . . . . . . . .   7
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     12.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The DHCP Relay Agent Assignment Notification (RAAN) option
   encapsulates address and prefix options to indicate that an address
   or prefix has been assigned.  The option may also carry other
   information required by the network element for configuration related
   to the assigned address or prefix.

   For example, a relay agent uses the RAAN option to learn when a
   prefix that has been delegated through DHCP prefix delegation (PD) to
   a DHCP client.  The relay agent notifies the network element on which
   it is implemented of the delegation information so the network
   element can add routing information about the delegated prefix into
   the routing infrastructure.

   While the practice to date for DHCPv6 has been for the relay agents
   to "snoop" the client's message (encapsulated in the received Relay
   Message option, and which is forwarded to the client), this will no
   longer be possible when clients and servers use
   [I-D.ietf-dhc-sedhcpv6] to encrypt their communication.

   Use of the RAAN option has another benefit in that the Reply to a
   client's Release message, which does not have any useful information
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