One document matched: draft-meyer-lisp-eid-block-00.txt

Network Working Group                                           D. Lewis
Internet-Draft                                                  D. Meyer
Intended status: Experimental                                  V. Fuller
Expires: September 18, 2008                          Cisco Systems, Inc.
                                                          March 17, 2008


                             LISP EID Block
                   draft-meyer-lisp-eid-block-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 September 18, 2008.

Abstract

   This is a direction to IANA to allocate a /16 IPv6 prefix for use
   with the Locator/ID Separation Protocol (LISP) and LISP Alternative
   Topology (LISP-ALT) mapping system.











Lewis, et al.          Expires September 18, 2008               [Page 1]

Internet-Draft               LISP EID Block                   March 2008


Table of Contents

   1.  Requirements Notation . . . . . . . . . . . . . . . . . . . . . 3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Definition of Terms . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6
   Intellectual Property and Copyright Statements  . . . . . . . . . . 7






































Lewis, et al.          Expires September 18, 2008               [Page 2]

Internet-Draft               LISP EID Block                   March 2008


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 [RFC2119].


2.  Introduction

   This is a direction to IANA to allocate a /16 IPv6 prefix for use
   with the Locator/ID Separation Protocol (LISP) [LISP] and LISP
   Alternative Topology (LISP-ALT) [LISP-ALT] mapping system.  This
   block will be used as global Endpoint ID (EID) space (Section 3) for
   the LISP-ALT mapping system.


3.  Definition of Terms

   LISP-ALT operates on two name spaces and introduces a new network
   element, the LISP-ALT Router (see below).  This section provides
   high-level definitions of the LISP-ALT name spaces, network elements,
   and message types.

   The LISP Alternative Topology (LAT):  The virtual overlay network
      made up of Generic Routing Encapsulation (GRE) tunnels between EID
      Prefix Aggregators.  The Border Gateway Protocol (BGP) runs
      between LISP-ALT routers and is used to carry reachability
      information for EID prefixes.

   Legacy Internet:  The portion of the Internet which does not run LISP
      and does not participate in LISP-ALT.

   LISP-ALT Router:  The devices which run on the LAT.  The LAT is a
      static network built with GRE tunnels.  LISP-ALT routers are
      deployed in a hierarchy which matches the EID prefix allocation
      hierarchy.  LISP-ALT routers at each level in the this hierarchy
      are responsible for aggregating all EID prefixes learned from
      LISP-ALT routers logically "below" them and advertising summary
      prefixes to the LISP-ALT routers logically "above" them.  All
      prefix learning and propagation between levels is done using BGP.
      LISP-ALT routers at the lowest level, or "edge", of the LAT learn
      EID prefixes either over a BGP or LISP TCP session to ETRs.

      The primary function of LISP-ALT routers is to provide a
      lightweight forwarding infrastructure for LISP control-plane
      messages (Map-Request and Map-Reply), and to transport data
      packets when the packet has the same destination address in both
      the inner (encapsulating) destination and outer destination



Lewis, et al.          Expires September 18, 2008               [Page 3]

Internet-Draft               LISP EID Block                   March 2008


      addresses ((i.e., a Data Probe packet).

    Endpoint ID (EID):  A 32- or 128-bit value used in the source and
      destination fields of the first (most inner) LISP header of a
      packet.  A packet that is emitted by a system contains EIDs in its
      headers and LISP headers are prepended only when the packet
      reaches an Ingress Tunnel Router (ITR) on the data path to the
      destination EID.

      In LISP-ALT, EID-prefixes MUST BE assigned in a hierarchical
      manner (in power-of-two) such that they can be aggregated by LISP-
      ALT routers.  In addition, a site may have site-local structure in
      how EIDs are topologically organized (subnetting) for routing
      within the site; this structure is not visible to the global
      routing system.

   EID-Prefix Aggregate:  A set of EID-prefixes said to be aggregatable
      in the [RFC4632] sense.  That is, an EID-Prefix aggregate is
      defined to be a single contiguous power-of-two EID-prefix block.
      Such a block is characterized by a prefix and a length.

   Routing Locator (RLOC):  An IP address of an egress tunnel router
      (ETR).  It is the output of a EID-to-RLOC mapping lookup.  An EID
      maps to one or more RLOCs.  Typically, RLOCs are numbered from
      topologically-aggregatable blocks that are assigned to a site at
      each point to which it attaches to the global Internet; where the
      topology is defined by the connectivity of provider networks,
      RLOCs can be thought of as Provider Aggregatable (PA) addresses.
      Note that in LISP-ALT, RLOCs are not carried by LISP-ALT routers.

    EID-to-RLOC Mapping:  A binding between an EID and the RLOC-set that
      can be used to reach the EID.  The term "mapping" refers to an
      EID-to-RLOC mapping.

    EID Prefix Reachability:  An EID prefix is said to be "reachable" if
      one or more of its locators are reachable.  That is, an EID prefix
      is reachable if the ETR (or its proxy) that is authoritative for a
      given EID-to-RLOC mapping is reachable.

    Default Mapping:  A Default Mapping is a mapping entry for EID-
      prefix 0.0.0.0/0.  It maps to a locator-set used for all EIDs in
      the Internet.  If there is a more specific EID-prefix in the
      mapping cache it overrides the Default Mapping entry.  The Default
      Mapping route can be learned by configuration or from a Map-Reply
      message.






Lewis, et al.          Expires September 18, 2008               [Page 4]

Internet-Draft               LISP EID Block                   March 2008


    Default Route:  A Default Route in the context of LISP-ALT is a EID-
      prefix value of 0.0.0.0/0 which is advertised by BGP on top of the
      LAT.  The Default Route is used to realize a path for Data Probe
      and Map-Request packets.


4.  Security Considerations

   This document introduces no new security considerations.


5.  Acknowledgments

   Marla Azinger, Chris Morrow, and Peter Schoenmaker all made
   insightful comments on early versions of this draft.


6.  IANA Considerations

   This document instructs the IANA to allocate a /16 IPv6 prefix for
   LISP and LISP-ALT deployment.


7.  References

7.1.  Normative References

   [LISP]     Farinacci, D., Fuller, V., Oran, D., and D. Meyer,
              "Locator/ID Separation Protocol (LISP)",
              draft-farinacci-lisp-06 (work in progress), November 2007.

   [LISP-ALT]
              Farinacci, D., Fuller, V., and D. Meyer, "LISP Alternative
              Topology (LISP-ALT)", draft-fuller-lisp-alt-02 (work in
              progress), November 2007.

   [RFC1918]  Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and
              E. Lear, "Address Allocation for Private Internets",
              BCP 5, RFC 1918, February 1996.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4632]  Fuller, V. and T. Li, "Classless Inter-domain Routing
              (CIDR): The Internet Address Assignment and Aggregation
              Plan", BCP 122, RFC 4632, August 2006.





Lewis, et al.          Expires September 18, 2008               [Page 5]

Internet-Draft               LISP EID Block                   March 2008


7.2.  Informative References

   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
              October 1998.

   [RFC2993]  Hain, T., "Architectural Implications of NAT", RFC 2993,
              November 2000.


Authors' Addresses

   Darrel Lewis
   Cisco Systems, Inc.

   Email: darlewis@cisco.com


   David Meyer
   Cisco Systems, Inc.

   Email: dmm@cisco.com


   Vince Fuller
   Cisco Systems, Inc.

   Email: vaf@cisco.com























Lewis, et al.          Expires September 18, 2008               [Page 6]

Internet-Draft               LISP EID Block                   March 2008


Full Copyright Statement

   Copyright (C) The IETF Trust (2008).

   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, THE IETF TRUST 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.











Lewis, et al.          Expires September 18, 2008               [Page 7]