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   available from each protocol.  More than a year has now passed since
   the IESG's recommendation.  There have been significant advancements
   in specification, implementation, and operational experience with
   each protocol.  It is now reasonable to re-open the consideration of
   designating a "common IGP".

   At the March 1991 meeting of the IETF, the IETF Routing Area Director
   presented a set of criteria for the advancement of routing protocols
   through the Internet standards process [6].  More information
   regarding the IAB Internet Standards process can be found in [1].

   Also, at the March 1991 meeting of the IETF, the OSPF Working Group
   requested that OSPF be considered for advancement to Draft Internet
   Standard.  The OSPF WG submitted four documents to the IETF to
   support its request:

   o a revised protocol specification to update [4];

   o an SNMP Management Information Base (MIB);

   o two technical reports giving a technical analysis and operational
     experience with OSPF.  These reports follow the format recommended
     in [6].




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   These four documents have now been published as [7, 8, 9, 10]
   respectively.

   In summary for OSPF:

   o all features of OSPF have tested (although not all features have
     been used in operation),

   o OSPF has been shown to operate well in several operational
     networks containing between 10 and 30 routers,

   o interoperation among routers from multiple vendors has been
     demonstrated at organized "bakeoffs".

   In May 1991, the IAB approved the IETF/IESG recommendation to advance
   OSPF to Draft Internet Standard.

   Integrated IS-IS, as specified in [5], is currently a Proposed
   Internet Standard.  In July 1991, the status of Integrated IS-IS is
   as follows:

   o There are several separate implementations of integrated
     IS-IS under development,

   o Integrated IS-IS has worked well in several multi-area operational
     networks, one containing between 20 and 30 routers,

   o These recent operational results have not yet been fully
     documented.  Documentation, showing satisfaction of the criteria
     given in [6] for advancing routing protocols, will be submitted
     to the IESG when Integrated IS-IS is submitted for Draft Internet
     Standard status.

7. IESG Recommendations

7.1 Regarding the Common IGP for the IP Internet

   Based on the available operational experience and the pressing need
   for a high functionality IGP for the IP protocol family, the IESG
   recommends that OSPF be designated as the common IGP for the IP
   portions of the Internet.  To help ensure that this IGP is available
   to all users, the IESG recommends that the IETF Router Requirements
   Working Group specify OSPF as "MUST IMPLEMENT" in the document
   "Requirements for Internet IP Routers".







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7.2 Regarding Integrated Routing

   As mentioned above, the IESG is commited to multiprotocol
   environments, and expects usage of OSI CLNP to increase in the
   Internet over time.

   However, at this time, the IESG is not prepared to take a position
   regarding the preference of either "Ships in the Night" or Integrated
   routing for such mixed routing environments.  At this time, the
   "Ships in the Night" approach is most widely used in the Internet.
   Integrated routing has the potential advantage of reducing resource
   utilization.  However, additional operational experience is needed
   before any potential advantages can be fully evaluated.

   Therefore, the IESG wishes to encourage implementation of Integrated
   IS-IS so that a reasonable position can be determined based on
   operational experience.  All implementers of Integrated IS-IS are
   encouraged to coordinate their activity with the IETF IS-IS Working
   Group, which is actively collecting information on such experience.

7.3 Limits of the Recommendation

   It is useful to recognize the limits of this recommendation.  This
   recommendation does not take a position on any of the following
   issues:

   1. What IGP (if any) users should run inside an AS. Users are free to
      run any IGP they wish inside an AS.

   2. What IGP is technically superior, or has greater operational
      utility.

   3. What IGP any vendor should recommend to its users for any specific
      environment.

   4. What IGP should be used within a CLNP-only environment.

   Again, this recommendation is meant to designate one modern high
   functionality IGP that should be implemented by all vendors of
   routers for the IP portion of the Internet.  This will enable routers
   from vendors who follow this recommendation to interoperate within a
   single IP Autonomous System.

   It is not our intent to discourage the use of other routing protocols
   in situations where there may be sound technical reasons to do so.
   Therefore, developers of Internet routers are free to implement, and
   network operators are free to use, other Internet standard routing
   protocols, or proprietary non-Internet-standard routing protocols, as



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   they wish.

8.  References

   [1] Internet Activities Board, "The Internet Standards Process", RFC
       1310, IAB, March 1992.

   [2] Lougheed, K., and Y. Rekhter, "A Border Gateway Protocol 3 (BGP-
       3)", RFC 1267, cisco Systems, T.J. Watson Research Center, IBM
       Corp., October 1991.

   [3] Mills, D., "Exterior Gateway Protocol Formal Specification", STD
       18, RFC 904, UDEL, April 1984.

   [4] Moy, J., "OSPF Specification", RFC 1131 (Superceded by [7]),
       Proteon, October 1989.

   [5] Callon, R., "Use of OSI IS-IS for Routing in TCP/IP and Dual
       Environments", RFC 1195, DEC, December 1990.

   [6] Hinden, R., "Criteria for Standardizing Internet Routing
       Protocols", RFC 1264, BBN, October 1991.

   [7] Moy, J., "OSPF Version 2", RFC 1247, Proteon, July 1991.

   [8] Baker, F., and R. Coltun, "OSPF Version 2 Management Information
       Base", RFC 1253, ACC, Computer Science Center, August 1991.

   [9] Moy, J., "Experience with the OSPF Protocol", RFC 1246, Proteon,
       July 1991.

  [10] Moy, J., "OSPF Protocol Analysis", RFC 1245, Proteon, July 1991.

  [11] Internet Architecture Board, "Applicability Statement for OSPF",
       RFC 1370, IAB, October 1992.
















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9. Security Considerations

   Security issues are not discussed in this memo.

10. Author's Address

   Phillip Gross, IESG Chair
   Advanced Network & Services
   100 Clearbrook Road
   Elmsford, NY

   Phone: [phone]
   EMail: [e-mail]






































IESG                                                            [Page 9]