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Network Working Group                                     A. Lindem, Ed.
Internet-Draft                                                   N. Shen
Intended status: Standards Track                                 E. Chen
Expires: August 29, 2016                                   Cisco Systems
                                                       February 26, 2016


   OSPF Extensions for Advertising/Signaling Geo Location Information
                  draft-acee-ospf-geo-location-01.txt

Abstract

   This document specifies an OSPF Link-Local-Signaling (LLS) TLV to
   signal the current Geo Coordinates of the OSPF router.  For Point-to-
   Point (P2P)) and Point-to-Multi-Point (P2MP) networks, the Geo
   Coordinates can be used to dynamically computing the cost to
   neighbors.  This is useful both from the standpoint of auto-
   configuration and situations where the OSPF routers are moving.  The
   Geo Coordinates are also useful for other applications such as
   Traffic Engineering (TE) and network management and can be advertised
   in the OSPF Router Information (RI) LSA.

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 29, 2016.

Copyright Notice

   Copyright (c) 2016 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



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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Notation . . . . . . . . . . . . . . . . . .   2
   2.  OSPF Geo Coordinates TLV  . . . . . . . . . . . . . . . . . .   2
   3.  OSPF Geo Coordinates Link-Local-Signaling . . . . . . . . . .   4
   4.  OSPFv2 Router Information (RI) Opaque LSA . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This document specifies an OSPF Link-Local-Signaling (LLS) TLV to
   signal the current Geo Coordinates of the OSPF router.  For Point-to-
   Point (P2P)) and Point-to-Multi-Point (P2MP) networks, the Geo
   Coordinates can be used to dynamically computing the cost to
   neighbors.  This is useful both from the standpoint of auto-
   configuration and situations where the OSPF routers are moving.  The
   Geo Coordinates are also useful for other applications such as
   Traffic Engineering (TE) and network management and can be advertised
   in the OSPF Router Information (RI) LSA [OSPF-RI].

1.1.  Requirements Notation

   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 [RFC-KEYWORDS].

2.  OSPF Geo Coordinates TLV

   The Geo Coordinates TLV can be used to advertise the current location
   of an OSPFv2 [OSPF] or OSPFv3 [OSPFV3] router using either OSPF Link-
   Local-Signaling [LLS] or the OSPF Router Information LSA [OSPF-RI].
   The value of the Geo Coordinates TLV consists of the following
   fields:

    0                   1                   2                   3



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    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |U|N|E|A|M|     Reserved        |   Location Uncertainty        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Latitude Degr. |     Latitude Milliseconds                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Longitude Degr.|     Longitude Milliseconds                    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                              Altitude                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |         .. Optional Sub-TLVs
   +-+-+-+-+-+-+-+-+-....

   Where:

    U-bit: If the U-bit is set, it indicates that the "Location
           Uncertainty" field is specified. If the U-bit is clear,
           it indicates the "Location Uncertainty" field is
           unspecified.

    N-bit: If the N-bit is set, it indicates the Latitude is
           north relative to the Equator. If the N-bit is clear,
           it indicates the Latitude is south of the Equator.

    E-bit: If the E-bit is set, it indicates the Longitude is east
           of the Prime Meridian. If the E-bit is clear, it indicates
           the Longitude is west of the Prime Meridian.

    A-bit: If the A-bit is set, it indicates the "Altitude" field is
           specified. If the A-bit is clear, it indicates the
           "Altitude" field is unspecified.

    M-bit: If the M-bit is set, it indicates the "Altitude" is
           specified in meters. If the M-bit is clear, it indicates
           the "Altitude" is in centimeters.

    Reserved: These bits are reserved.  They SHOULD be set to 0 when
              sending protocol packets and MUST be ignored when
              receiving protocol packets.

    Location Uncertainty: Unsigned 16-bit integer indicating the
                          number of centimeters of uncertainty for
                          the location.

    Latitude Degrees: Unsigned 8-bit integer with a range of 0 - 90
                      degrees north or south of the Equator (northern
                      or southern hemisphere, respectively).




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    Latitude Milliseconds: Unsigned 24-bit integer with a range of
                           0 - 3,599,999 (i.e., less than 60 minutes).

    Longitude Degrees: Unsigned 8-bit integer with a range of 0 - 180
                       degrees east or west of the Prime Meridian.

    Longitude Milliseconds: Unsigned 24-bit integer with a range of
                            0 - 3,599,999 (i.e., less than 60 minutes).

    Altitude: Signed 32-bit integer containing the Height relative to
              sea level in centimeters or meters.  A negative height
              indicates that the location is below sea level.

    Optional Sub-TLVs: No additional Sub-TLVs are defined in this
                       document.


                         OSPF Geo Coordinates TLV


3.  OSPF Geo Coordinates Link-Local-Signaling

   The OSPF Geo Coordinates TLV may optionally be included in the Link-
   Local-Signaling [LLS] data block appended to OSPF hello packets.

   When an OSPF router receives the Geo Coordinates TLV in the LLS
   extension from an adjacent neighbor, it can be used to calculate the
   physical distance to neighbor.  For P2P and P2MP networks, this
   distance can be used to dynamically compute the cost of the link to
   that neighbor.  The mapping of the distance to advertised cost is a
   local matter and is not specified in this document.  Computation of
   cost based on physical distance can be useful both for
   autoconfiguration of these networks types and dynamic cost
   computation when the routers are moving.

   The Geo location information can be statically provisioned or
   dynamically acquired from a GPS capable device on the OSPF Router.

4.  OSPFv2 Router Information (RI) Opaque LSA

   The OSPF Geo Coordinates TLV may optionally be advertised in the OSPF
   Router Information (RI) LSA [OSPF-RI].  It then may be used for
   applications such as traffic engineering (TE) and network management
   (e.g., the Find-My-Router application).  The details of such
   applications are beyond the scope of this document.






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5.  Security Considerations

   Since the Geo Location coordinates provide the exact location of the
   OSPF router, disclosure will make the OSPF router more susceptible to
   physical attacks.  In situations where this is a concern (e.g.,
   military applications), confidentiality should be provided either
   through a secure tunnel (e.g., [IP-ESP]) or protocol encryption
   [OSPFV3-AUTH].

   Additionally, in some situations, the topology of the network is
   considered proprietary information.  With the Geo Location
   coordinates, the physical topology, as well as the IP topology, can
   be discerned from the OSPF Router Information (RI) LSA.  In these
   situations, confidentiality should be assured.

   Security considerations for the base OSPF protocol are covered in
   [OSPF] and [OSPFV3].

6.  IANA Considerations

   The document will require two IANA actions:

   1.  An LLS Type TLV for the Geo Location TLV will be allocated from
       the OSPF Link Local Signaling TLV Identifiers (LLS Types)
       registry.

   2.  A Router Information TLV type for the Geo Location TLV will be
       allocated from the OSPF Router Information (RI) TLVs registry.

7.  References

7.1.  Normative References

   [LLS]      Zinin, A., Roy, A., Nguyen, L., Friedman, B., and D.
              Young, "OSPF Link-local Signaling", RFC 5613, August 2009.

   [OSPF]     Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998.

   [OSPF-RI]  Lindem, A., Shen, N., Vasseur, J., Aggarwal, R., and S.
              Shaffer, "Extensions to OSPF for Advertising Optional
              Router Capabilities", RFC 7770, January 2016.

   [OSPFV3]   Coltun, R., Ferguson, D., Moy, J., and A. Lindem, "OSPF
              for IPv6", RFC 5340, July 2008.

   [RFC-KEYWORDS]
              Bradner, S., "Key words for use in RFC's to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.



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7.2.  Informative References

   [IP-ESP]   Kent, S., "IP Encapsulation Security Payload (ESP)", RFC
              4303, December 2005.

   [OSPFV3-AUTH]
              Gupta, M. and S. Melam, "Authentication/Confidentiality
              for OSPFv3", RFC 4552, June 2006.

Appendix A.  Acknowledgments

   The RFC text was produced using Marshall Rose's xml2rfc tool.

   The encoding of the Geo location is adapted from the "Geo Coordinate
   LISP Canonical Address Format" specified in the "LISP Canonical
   Address Format (LCAF)".  We would like to thank the authors of that
   Document and particularily Dino Farinacci for subsequent discussions.

   Thanks to Yi Yang for review and discussions of the Geo Coordinate
   encoding.

   The use-case for using OSPF to advertise the geo-location in OSPF was
   first mentioned in an OSPF operator-defined TLV draft by Uma
   Chunduri, Xiaohu Xu, Luis M.  Contreras, Mohamed Boucadair, and Luay
   Jalil.

Authors' Addresses

   Acee Lindem (editor)
   Cisco Systems
   301 Midenhall Way
   Cary, NC  27513
   USA

   Email: acee@cisco.com


   Naiming Shen
   Cisco Systems
   821 Alder Drive
   Milpitas, CA  95935
   USA

   Email: naiming@cisco.com







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   Enke Chen
   Cisco Systems
   821 Alder Drive
   Milpitas, CA  95935
   USA

   Email: enkechen@cisco.com












































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