Geopriv J. Winterbottom
Internet-Draft M. Thomson
Intended status: Standards Track Andrew Corporation
Expires: April 4, 2007 Oct 2006
HELD End-Point identity Extensions
draft-winterbottom-geopriv-held-identity-extensions-00.txt
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on April 4, 2007.
Copyright Notice
Copyright (C) The Internet Society (2006).
Winterbottom & Thomson Expires April 4, 2007 [Page 1]
Internet-Draft HELD-ID-EXT Oct 2006
Abstract
This document describes a schema for extending HELD Target
identification beyond source IP Address. It describes real-world
situations where such a mechanism can be deployed, and provides
examples of HELD message syntax including identity extensions.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Example Network Deployments . . . . . . . . . . . . . . . . . 6
4.1. Digital Subscriber Line Networks . . . . . . . . . . . . . 6
4.2. LLDP Enabled Network . . . . . . . . . . . . . . . . . . . 7
5. XML Schema Definition . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
7.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:geopriv:held:deviceIdentifiers . . 14
7.2. XML Schema Registration . . . . . . . . . . . . . . . . . 14
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.1. Normative references . . . . . . . . . . . . . . . . . . . 17
9.2. Informative references . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18
Intellectual Property and Copyright Statements . . . . . . . . . . 19
Winterbottom & Thomson Expires April 4, 2007 [Page 2]
Internet-Draft HELD-ID-EXT Oct 2006
1. Introduction
The HELD protocol [I-D.winterbottom-http-location-delivery] defines
the way in in which location information is acquired from a Location
Information Server (LIS). HELD uses the IP address of the location
request message as the primary source of identifier for the
requesting device, there are however circumstances and network
configurations where an IP address alone is insufficient to identify
a Target in a network. This specification defines an identity
extensions schema that can be used by requesting devices to assist
the LIS in determining their physical location.
Winterbottom & Thomson Expires April 4, 2007 [Page 3]
Internet-Draft HELD-ID-EXT Oct 2006
2. Terminology
The key conventions and terminology used in this document are defined
as follows:
This document reuses the terms Target, as defined in [RFC3693].
This document uses the term Location Information Server, LIS, to
represent a combined Location Server and Location Generator (as
defined in [RFC3693]) residing inside the local access domain.
Broadband Regional Aggregation Server (BRAS). A node in a DSL
network responsible for switching data streams between end-points and
Internet Service Providers.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Winterbottom & Thomson Expires April 4, 2007 [Page 4]
Internet-Draft HELD-ID-EXT Oct 2006
3. Overview
A basic premise in HELD is that the source IP address of the location
request message can be used by the LIS to identify the requesting
Target, and that this identity can be used with other contextual
network information to provide a physical location for the Target.
In many network deployments this premise holds true, but in some
network deployments additional identifiers are required to identify
the Target at different points throughout the network, or they may
assist with speeding up location determination.
The base HELD schema was designed with extensibility in mind and the
assumption that IP address may not always be enought to identify a
Target. The HELD identity extensions schema is made up of a number
of discrete element blocks that can included into the HELD
locationRequest, createContext and updateContext messages. These
elements can then be used by the LIS to identify the Target closer to
the edge of the network, for example a MAC address or DHCP client-
identifier, or to identify an element that has a closer relationship
with the target, for example LLDP switch and port information. The
identity extension elements have been desgined to work across a range
of existing and emerging technologies. It is envisaged that while
this schema is not exhaustive, it will address many of the perceived
deployment solution. It is further envisaged that extensions to this
schema will be necessary as new identifiers are created or required.
Winterbottom & Thomson Expires April 4, 2007 [Page 5]
Internet-Draft HELD-ID-EXT Oct 2006
4. Example Network Deployments
4.1. Digital Subscriber Line Networks
Digital Subscriber Line (DSL) networks represent the fastest growing
residentital broadband technology. DSL networks have evolved
consideraly since their first deployments, with core aggregation
architectures being covered in DSL forum documents [TR025] and
[TR101]. DSL depoloyments are frequently constructed through the
cooperation of two or more providers. These can be generalized into
two basic categories, infrastructure providers and Internet
providers. Infrastructure providers own the cables and provide layer
2 connectivity from a residence to the Internet provider. The
Internet provider assigns an IP address and provides routing and
access to broader network services. End users obtain their service
from and ISP, that in turn needs to negotiate access from an
Infrastructure provider. Request for location from the end user
therefore, are made to the Internet Service Provider (ISP) LIS. In
many cases the ISP LIS is unable to provide location as it is removed
from the physical access network, consequently it needs to request
location from the Infrastructure provider LIS. Depending on the
network configuration the ISP LIS may need to provide the
Infrastructure provider LIS with additional identifier information
that it can glean when the end-point connection is established with
the ISP Network Access Server (NAS).
Determining location in DSL environments is dependent on identifying
and following provisioned circuit chains. And circuit chains are
identified differently depending the DSL network deployment. Take
for example a deployment that uses a proxy-RADIUS service between the
BRAS, this mode of operation IP routing is used between the BRAS and
the ISP NAS. In this case, the Infrastructure provider LIS may
information about incoming port information to the BRAS that it can
link back to a DSLAM port, and hence a street address. Since the
BRAS must perform IP routing to the ISP NAS, the Infrastructure
provider LIS may more easily perform associations between IP address
and provisioned circuit chain information.
A large number of DSL deployments however use L2TP connections from
the BRAS to the ISP NAS. In this case, the Infrastructure provider
LIS can only link tunnel and session information to with the
provisioned circuit chain. Since the ISP LIS can obtain this same
tunnel and session information it can provide this in a HELD request
to the Infrastructre provider LIS, and obtain the location of the
end-point. A HELD location request using this meachnism may look
something similar to the figure below.
Winterbottom & Thomson Expires April 4, 2007 [Page 6]
Internet-Draft HELD-ID-EXT Oct 2006
See RFCXXXX.
END 7.2. XML Schema Registration This section registers an XML schema as per the guidelines in [RFC3688]. URI: urn:ietf:params:xml:schema:geopriv:held:deviceIdentifiers Winterbottom & Thomson Expires April 4, 2007 [Page 14] Internet-Draft HELD-ID-EXT Oct 2006 Registrant Contact: IETF, GEOPRIV working group, (geopriv@ietf.org), James Winterbottom (james.winterbottom@andrew.com). Schema: The XML for this schema can be found as the entirety of Section 5 of this document. Winterbottom & Thomson Expires April 4, 2007 [Page 15] Internet-Draft HELD-ID-EXT Oct 2006 8. Acknowledgements The authors wish to thank the NENA VoIP location working group for their assistance in the definition of the schema used in this document. Winterbottom & Thomson Expires April 4, 2007 [Page 16] Internet-Draft HELD-ID-EXT Oct 2006 9. References 9.1. Normative references [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [I-D.winterbottom-http-location-delivery] Winterbottom, J., "HTTP Enabled Location Delivery (HELD)", draft-winterbottom-http-location-delivery-03 (work in progress), May 2006. 9.2. Informative references [RFC3693] Cuellar, J., Morris, J., Mulligan, D., Peterson, J., and J. Polk, "Geopriv Requirements", RFC 3693, February 2004. [TR025] Wang, R., "Core Network Architecture Recommendations for Access to Legacy Data Networks over ADSL", September 1999. [TR101] Cohen, A. and E. Shrum, "Migration to Ethernet-Based DSl Aggregation", April 2006. [LLDP] IEEE, "802.1AB, IEEE Standard for Local and Metropolitan area networks, Station and Media Access Control Connectivity Discovery", June 2005. Winterbottom & Thomson Expires April 4, 2007 [Page 17] Internet-Draft HELD-ID-EXT Oct 2006 Authors' Addresses James Winterbottom Andrew Corporation PO Box U40 University of Wollongong, NSW 2500 AU Email: james.winterbottom@andrew.com Martin Thomson Andrew Corporation PO Box U40 University of Wollongong, NSW 2500 AU Email: martin.thomson@andrew.com Winterbottom & Thomson Expires April 4, 2007 [Page 18] Internet-Draft HELD-ID-EXT Oct 2006 Full Copyright Statement Copyright (C) The Internet Society (2006). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Winterbottom & Thomson Expires April 4, 2007 [Page 19]