Network Working Group                                 A. Lindem (Editor)
Internet-Draft                                          Redback Networks
Intended status: Standards Track                                 N. Shen
Expires: November 8, 2007                                     J. Vasseur
                                                           Cisco Systems
                                                             R. Aggarwal
                                                        Juniper Networks
                                                              S. Shaffer
                                                     BridgePort Networks
                                                             May 7, 2007


    Extensions to OSPF for Advertising Optional Router Capabilities
                       draft-ietf-ospf-cap-11.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 November 8, 2007.

Copyright Notice

   Copyright (C) The IETF Trust (2007).








Lindem (Editor), et al.  Expires November 8, 2007               [Page 1]


Internet-Draft         OSPF Capability Extensions               May 2007


Abstract

   It is useful for routers in an OSPFv2 or OSPFv3 routing domain to
   know the capabilities of their neighbors and other routers in the
   routing domain.  This draft proposes extensions to OSPFv2 and OSPFv3
   for advertising optional router capabilities.  A new Router
   Information (RI) Link State Advertisement (LSA) is proposed for this
   purpose.  In OSPFv2, the RI LSA will be implemented with a new opaque
   LSA type ID.  In OSPFv3, the RI LSA will be implemented with a new
   LSA type function code.  In both protocols, the RI LSA can be
   advertised at any of the defined flooding scopes (link, area, or AS).


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements notation  . . . . . . . . . . . . . . . . . .  3
   2.  OSPF Router Information (RI) LSA . . . . . . . . . . . . . . .  4
     2.1.  OSPFv2 Router Information (RI) Opaque LSA  . . . . . . . .  4
     2.2.  OSPFv3 Router Information (RI) Opaque LSA  . . . . . . . .  5
     2.3.  OSPF Router Informational Capabilities TLV . . . . . . . .  6
     2.4.  Assigned OSPF Router Informational Capability Bits . . . .  7
     2.5.  Flooding Scope of the Router Information LSA . . . . . . .  7
   3.  Router Information LSA Opaque Usage and Applicability  . . . .  8
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  Acknowledgments . . . . . . . . . . . . . . . . . . . 13
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14
   Intellectual Property and Copyright Statements . . . . . . . . . . 15



















Lindem (Editor), et al.  Expires November 8, 2007               [Page 2]


Internet-Draft         OSPF Capability Extensions               May 2007


1.  Introduction

   It is useful for routers in an OSPFv2 [OSPF] or OSPFv3 [OSPFV3]
   routing domain to know the capabilities of their neighbors and other
   routers in the routing domain.  This can be useful for both the
   advertisement and discovery of OSPFv2 and OSPFv3 capabilities.
   Throughout this document, OSPF will be used when the specification is
   applicable to both OSPFv2 and OSPFv3.  Similarly, OSPFv2 or OSPFv3
   will be used when the text is protocol specific.

   OSPF uses the options field in LSAs and hello packets to advertise
   optional router capabilities.  In the case of OSPFv2, all the bits in
   this field have been allocated and there is no way to advertise new
   optional capabilities.  This document proposes extensions to OSPF to
   advertise these optional capabilities via opaque LSAs in OSPFv2 and
   new LSAs in OSPFv3.  For existing OSPF capabilities, backward
   compatibility issues dictate that this advertisement is used
   primarily for informational purposes.  For future OSPF features, this
   advertisement MAY be used as the sole mechanism for advertisement and
   discovery.

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].

























Lindem (Editor), et al.  Expires November 8, 2007               [Page 3]


Internet-Draft         OSPF Capability Extensions               May 2007


2.  OSPF Router Information (RI) LSA

   OSPF routers MAY optionally advertise their optional capabilities in
   a link-scoped, area-scoped, or AS-scoped LSA.  For existing OSPF
   capabilities, this advertisement will be used primarily for
   informational purposes.  Future OSPF features could use the RI LSA as
   the sole mechanism for advertisement and discovery.  The RI LSA will
   be originated initially when an OSPF router instance is created and
   whenever one of the advertised capabilities is configured or changed.

2.1.  OSPFv2 Router Information (RI) Opaque LSA

   OSPFv2 routers will advertise a link scoped, area-scoped, or AS-
   scoped Opaque-LSA [OPAQUE].  The OSPFv2 Router Information LSA has an
   Opaque type of 4 and Opaque ID of 0.


       0                   1                   2                   3
       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            LS age             |     Options   |  9, 10 or 11  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       4       |                    0                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Advertising Router                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     LS sequence number                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         LS checksum           |             length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +-                            TLVs                             -+
      |                             ...                               |


                   OSPFv2 Router Information Opaque LSA


   The format of the TLVs within the body of an RI LSA is the same as
   the format used by the Traffic Engineering Extensions to OSPF [TE].
   The LSA payload consists of one or more nested Type/Length/Value
   (TLV) triplets.  The format of each TLV is:









Lindem (Editor), et al.  Expires November 8, 2007               [Page 4]


Internet-Draft         OSPF Capability Extensions               May 2007


      0                   1                   2                   3
      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              Type             |             Length            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                            Value...                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                                TLV Format

   The Length field defines the length of the value portion in octets
   (thus a TLV with no value portion would have a length of zero).  The
   TLV is padded to four-octet alignment; padding is not included in the
   length field (so a three octet value would have a length of three,
   but the total size of the TLV would be eight octets).  Nested TLVs
   are also 32-bit aligned.  For example, a one-byte value would have
   the length field set to 1, and three octets of padding would be added
   to the end of the value portion of the TLV.  Unrecognized types are
   ignored.

2.2.  OSPFv3 Router Information (RI) Opaque LSA

   The OSPFv3 Router Information LSA has a function code of 12 while the
   S1/S2 bit are dependent on the desired flooding scope for the LSA.
   The U bit will be set indicating the OSPFv3 RI LSA should be flooded
   even if it is not understood.  The Link State ID (LSID) value for
   this LSA is 0.  This is unambiguous since an OSPFv3 router will only
   advertise a single RI LSA per flooding scope.


       0                   1                   2                   3
       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            LS age             |1|S12|          12             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         0  (Link State ID)                    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Advertising Router                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    LS sequence number                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |        LS checksum           |             Length             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +-                            TLVs                             -+
      |                             ...                               |




Lindem (Editor), et al.  Expires November 8, 2007               [Page 5]


Internet-Draft         OSPF Capability Extensions               May 2007


                       OSPFv3 Router Information LSA

   The format of the TLVs within the body of an RI LSA as defined in
   Section 2.1

   When a new Router Information LSA TLV is defined, the specification
   MUST explicitly state whether the TLV is applicable to OSPFv2 only,
   OSPFv3 only, or both OSPFv2 and OSPFv3.

2.3.  OSPF Router Informational Capabilities TLV

   The first defined TLV in the body of an RI LSA is the Router
   Informational Capabilities TLV.  A router advertising an RI LSA MAY
   include the Router Informational Capabilities TLV.  If included, it
   MUST be the first TLV in the LSA.  Additionally, the TLV MUST
   accurately reflect the OSPF router's capabilities in the scope
   advertised.  However, the informational capabilities advertised have
   no impact on the OSPFs operation - they are advertised purely for
   informational purposes

   The format of the Router Informational Capabilities TLV is as
   follows:


       0                   1                   2                   3
       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Type             |             Length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Informational Capabilities                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


      Type     A 16-bit field set to 1.
      Length   A 16-bit field that indicates the length of the value
               portion in octets and will be a multiple of 4 octets
               dependent on the number of capabilities advertised.
               Initially, the length will be 4 denoting 4 octets of
               informational capability bits.
      Value    A variable length sequence of capability bits rounded
               to a multiple of 4 octets padded with undefined bits.
               Initially, there are 4 octets of capability bits. Bits
               are numbered left-to-right starting with the most
               significant bit being bit zero.


                OSPF Router Informational Capabilities TLV




Lindem (Editor), et al.  Expires November 8, 2007               [Page 6]


Internet-Draft         OSPF Capability Extensions               May 2007


   The Router Informational Capabilities TLV MAY be followed by optional
   TLVs that further specify a capability.

2.4.  Assigned OSPF Router Informational Capability Bits

   The following informational capability bits assigned:


      Bit       Capabilities

      0         OSPF graceful restart capable [GRACE]
      1         OSPF graceful restart helper  [GRACE]
      2         OSPF Stub Router support [STUB]
      3         OSPF Traffic Engineering support [TE]
      4         OSPF point-to-point over LAN [P2PLAN]
      5         OSPF Experimental TE [EXP-TE]
      6-31      Future assignments


                OSPF Router Informational Capabilities Bits

2.5.  Flooding Scope of the Router Information LSA

   The flooding scope for a Router Information LSA is determined by the
   LSA type.  For OSPFv2, type 9 (link-scoped), type 10 (area-scoped),
   or a type 11 (AS-scoped) opaque LSA may be flooded.  For OSPFv3, the
   S1 and S2 bits in the LSA type determine flooding scope.  If AS wide
   flooding scope is chosen, the originating router should also
   advertise area scoped LSA(s) into any attached NSSA area(s).  An OSPF
   router MAY advertise different capabilities when both NSSA area
   scoped LSA(s) and an AS scoped LSA are advertised.  This allows
   functional capabilities to be limited in scope.  For example, a
   router may be an area border router but only support traffic
   engineering (TE) in a subset of its attached areas.

   The choice of flooding scope is made by the advertising router and is
   a matter of local policy.  The originating router MAY advertise
   multiple RI LSAs as long as the flooding scopes differ.  TLV flooding
   scope rules will be specified on a per-TLV basis and MUST be
   specified in the accompanying specifications for new Router
   Information LSA TLVs.










Lindem (Editor), et al.  Expires November 8, 2007               [Page 7]


Internet-Draft         OSPF Capability Extensions               May 2007


3.  Router Information LSA Opaque Usage and Applicability

   The purpose of the Router Information (RI) LSA is to advertise
   information relating to the aggregate OSPF router.  Normally, this
   should be confined to TLVs with a single value or very few values.
   It is not meant to be a generic container to carry any and all
   information.  The intent is to both limit the size of the RI LSA to
   the point where an OSPF router will always be able to contain the
   TLVs in a single LSA and to keep the task of determining what has
   changed between LSA instances reasonably simple.  Hence, discretion
   and sound engineering judgment will need to be applied when deciding
   whether newly proposed TLV(s) in support of a new application are
   advertised in the RI LSA or warrant the creation of an application
   specific LSA.





































Lindem (Editor), et al.  Expires November 8, 2007               [Page 8]


Internet-Draft         OSPF Capability Extensions               May 2007


4.  Security Considerations

   This document describes both a generic mechanism for advertising
   router capabilities and a TLV for advertising informational
   capability bits.  The latter TLV is less critical than the topology
   information currently advertised by the base OSPF protocol.  The
   security considerations for the generic mechanism are dependent on
   the future application and, as such, should be described as
   additional capabilities are proposed for advertisement.  Security
   considerations for the base OSPF protocol are covered in [OSPF] and
   [OSPFV3].








































Lindem (Editor), et al.  Expires November 8, 2007               [Page 9]


Internet-Draft         OSPF Capability Extensions               May 2007


5.  IANA Considerations

   The following IANA assignments are to be made from existing
   registries:

   1.  The OSPFv2 opaque LSA type 4 will need to be reserved for the
       OSPFv2 RI opaque LSA.

   New registries will need to be defined for the following purposes:

   1.  Registry for OSPFv3 LSA Function Codes - This new top-level
       registry will be comprised of the fields Value, LSA function code
       name, and Document Reference.  The OSPFv3 LSA function code is
       defined in section A.4.2.1 of [OSPFV3].  The OSPFv3 LSA function
       code 12 will need to be reserved for the OSPFv3 Router
       Information (RI) LSA.

                      +-----------+--------------------+
                      | Range     | Assignment Policy  |
                      +-----------+--------------------+
                      | 0         | Not to be assigned |
                      |           |                    |
                      | 1-9       | Already assigned   |
                      |           |                    |
                      | 10-255    | Standards Action   |
                      |           |                    |
                      | 256-8175  | Reserved           |
                      |           |                    |
                      | 8176-8183 | Experimentation    |
                      |           |                    |
                      | 8184-8191 | Vendor Private Use |
                      +-----------+--------------------+

                           OSPFv3 LSA Function Codes

       *  OSPFv3 LSA function codes in the range 256-8175 are not to be
          assigned at this time.  Before any assignments can be made in
          this range, there MUST be a Standards Track RFC that specifies
          IANA Considerations that covers the range being assigned.

       *  OSPFv3 LSA function codes in the range 8176-8181 are for
          experimental use; these will not be registered with IANA and
          MUST NOT be mentioned by RFCs.

       *  OSPFv3 LSAs with an LSA Function Code in the Vendor Private
          Use range 8184-8191 MUST include the Vendor Enterprise Code as
          the first four octets following the 20 octets of LSA header.




Lindem (Editor), et al.  Expires November 8, 2007              [Page 10]


Internet-Draft         OSPF Capability Extensions               May 2007


       *  If a new LSA Function Code is documented, the documentation
          MUST include the valid combinations of the U, S2 and S1 bits
          for the LSA.  It SHOULD also describe how the Link State ID is
          to be assigned.

   2.  Registry for OSPF RI TLVs - This top-level registry will be
       comprised of the fields Value, TLV Name, and Document Reference.
       The value of 1 for the capabilities TLV is defined herein.

                      +-------------+--------------------+
                      | Range       | Assignment Policy  |
                      +-------------+--------------------+
                      | 0           | Not to be assigned |
                      |             |                    |
                      | 1           | Already assigned   |
                      |             |                    |
                      | 2-32767     | Standards Action   |
                      |             |                    |
                      | 32768-32777 | Experimentation    |
                      |             |                    |
                      | 32778-65535 | Reserved           |
                      +-----------+----------------------+

                                 OSPF RI TLVs

       *  Types in the range 32768-32777 are for experimental use; these
          will not be registered with IANA and MUST NOT be mentioned by
          RFCs.

       *  Types in the range 32778-65535 are not to be assigned at this
          time.  Before any assignments can be made in this range, there
          MUST be a Standards Track RFC that specifies IANA
          Considerations that covers the range being assigned.

   3.  Registry for OSPF Router Informational Capability Bits - This
       sub-registry of the OSPF RI TLV registry will be comprised of the
       fields Bit Number, Capability Name, and Document Reference.  The
       values are defined in Section 2.3.  All Router Informational
       Capability TLV additions are to be assigned through standards
       action.











Lindem (Editor), et al.  Expires November 8, 2007              [Page 11]


Internet-Draft         OSPF Capability Extensions               May 2007


6.  References

6.1.  Normative References

   [OPAQUE]   Coltun, R., "The OSPF Opaque LSA Option", RFC 2370,
              July 1998.

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

   [OSPFV3]   Coltun, R., Ferguson, D., and J. Moy, "OSPF for IPv6",
              RFC 2740, December 1999.

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

   [TE]       Katz, D., Yeung, D., and K. Kompella, "Traffic Engineering
              Extensions to OSPF", RFC 3630, September 2003.

6.2.  Informative References

   [EXP-TE]   Srisuresh, P. and P. Joseph, "OSPF  OSPF-TE: An
              experimental extension to OSPF for Traffic Engineering",
              draft-srisuresh-ospf-te-07.txt (work in progress).

   [GRACE]    Moy, J., Pillay-Esnault, P., and A. Lindem, "Graceful OSPF
              Restart", RFC 3623, November 2003.

   [P2PLAN]   Shen, N. and A. Zinin, "Point-to-point operation over LAN
              in link-state routing protocols",
              draft-ietf-isis-igp-p2p-over-lan-05.txt (work in
              progress).

   [STUB]     Retana, A., Nguyen, L., White, R., Zinin, A., and D.
              McPherson, "OSPF Stub Router Advertisement", RFC 3137,
              June 2001.















Lindem (Editor), et al.  Expires November 8, 2007              [Page 12]


Internet-Draft         OSPF Capability Extensions               May 2007


Appendix A.  Acknowledgments

   The idea for this work grew out of a conversation with Andrew Partan
   and we would like to thank him for his contribution.  The authors
   would like to thanks Peter Psenak for his review and helpful comments
   on early versions of the draft.

   Comments from Abhay Roy, Vishwas Manral, Vivek Dubey, and Adrian
   Farrel have been incorporated into later draft versions.

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








































Lindem (Editor), et al.  Expires November 8, 2007              [Page 13]


Internet-Draft         OSPF Capability Extensions               May 2007


Authors' Addresses

   Acee Lindem
   Redback Networks
   102 Carric Bend Court
   Cary, NC  27519
   USA

   Email: acee@redback.com


   Naiming Shen
   Cisco Systems
   225 West Tasman Drive
   San Jose, CA  95134
   USA

   Email: naiming@cisco.com


   Jean-Philippe Vasseur
   Cisco Systems
   300 Beaver Brook Road
   Boxborough, MA  01719
   USA

   Email: jpv@cisco.com


   Rahul Aggarwal
   Juniper Networks
   1194 N. Mathilda Ave.
   Sunnyvale, CA  94089
   USA

   Email: rahul@juniper.net


   Scott Shaffer
   BridgePort Networks
   One Main Street, 7th Floor
   Cambridge, MA  02142
   USA

   Email: sshafferl@bridgeport-networks.com






Lindem (Editor), et al.  Expires November 8, 2007              [Page 14]


Internet-Draft         OSPF Capability Extensions               May 2007


Full Copyright Statement

   Copyright (C) The IETF Trust (2007).

   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.


Acknowledgment

   Funding for the RFC Editor function is provided by the IETF
   Administrative Support Activity (IASA).





Lindem (Editor), et al.  Expires November 8, 2007              [Page 15]