Lightweight DHCPv6 Relay Agent
RFC 6221
| Document | Type |
RFC - Proposed Standard
(May 2011; Errata)
Updates RFC 3315
|
|
|---|---|---|---|
| Authors | Wojciech Dec , Sven Ooghe , Alan Kavanagh , Suresh Krishnan , David Miles | ||
| Last updated | 2015-10-14 | ||
| Replaces | draft-miles-dhc-dhcpv6-ldra | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6221 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ralph Droms | ||
| IESG note | Ted Lemon (mellon@nominum.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) D. Miles, Ed.
Request for Comments: 6221 S. Ooghe
Updates: 3315 Alcatel-Lucent
Category: Standards Track W. Dec
ISSN: 2070-1721 Cisco Systems
S. Krishnan
A. Kavanagh
Ericsson
May 2011
Lightweight DHCPv6 Relay Agent
Abstract
This document proposes a Lightweight DHCPv6 Relay Agent (LDRA) that
is used to insert relay agent options in DHCPv6 message exchanges
identifying client-facing interfaces. The LDRA can be implemented in
existing access nodes (such as Digital Subscriber Link Access
Multiplexers (DSLAMs) and Ethernet switches) that do not support IPv6
control or routing functions.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6221.
Miles, et al. Standards Track [Page 1]
RFC 6221 LDRA May 2011
Copyright Notice
Copyright (c) 2011 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
(http://trustee.ietf.org/license-info) in effect on the date of
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 ....................................................3
1.1. Requirements Language ......................................3
2. Background ......................................................3
3. Terminology .....................................................3
4. Server Considerations ...........................................5
5. Message Format ..................................................5
5.1. Relay-Forward Message ......................................5
5.2. Relay-Reply Message ........................................6
5.3. Mandatory DHCP Options .....................................6
5.3.1. Relay-Message Option ................................6
5.3.2. Interface-ID Option .................................6
6. Agent Behaviour .................................................7
6.1. Relaying a Client Message ..................................7
6.1.1. Client Message Validation ...........................8
6.1.2. Trusted and Untrusted Interfaces ....................8
6.2. Relaying a Relay-Reply Message from the Network ............8
7. Network Topology ................................................9
7.1. Client and Server on Same Link .............................9
7.2. Client and Server behind Relay Agent ......................11
7.3. Relay Agent in Front of LDRA ..............................12
8. Contributors ...................................................15
9. Security Considerations ........................................15
10. References ....................................................15
10.1. Normative References .....................................15
10.2. Informative References ...................................16
Miles, et al. Standards Track [Page 2]
RFC 6221 LDRA May 2011
1. Introduction
DHCPv6 Relay Agents [RFC3315] are deployed to forward DHCPv6 messages
between clients and servers when they are not on the same IPv6 link
and are often implemented alongside a routing function in a common
node. A Lightweight DHCPv6 Relay Agent (LDRA) allows Relay Agent
Information to be inserted by an access node that performs a link-
layer bridging (i.e., non-routing) function. An LDRA resides on the
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