Network Working Group                          Internet Architecture Board
Request for Comments: 1370                             Lyman Chapin, Chair
                                                              October 1992

                    Applicability Statement for OSPF

Status of this Memo

   This memo is an IAB standards track Applicability Statement for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "IAB
   Official Protocol Standards" for the standardization state and status
   of this specification.  Distribution of this memo is unlimited.


   Users and vendors have expressed a strong need for IP routers from
   different vendors that can interoperate using a common Interior
   Gateway Protocol (IGP).  There is therefore an urgent requirement for
   a high-functionality non-proprietary 'open' IGP that will be
   ubiquitously available from all IP router vendors.

   The Open Shortest Path First (OSPF) routing protocol [1] was
   developed by the IETF to fill this need.  This Applicability
   Statement specifies the circumstances under which OSPF must be
   implemented by router vendors.  The history of OSPF development and
   the reasoning behind this Applicability Statement will be found in

   This Applicability Statement places a requirement on vendors claiming
   conformance to this standard, in order to assure that users will have
   the option of deploying OSPF when they need a multivendor,
   interoperable IGP in their environment.  Users are of course free to
   use whatever routing protocol best meets their requirements.


   An IP router that implements any routing protocol (other than static
   routes) is required to implement OSPF [1] and the OSPF MIB [2].
   Within OSPF, implementation of all features except TOS (Type-of-
   Service) routing is required; implementation of TOS routing is

   This requirement does not prevent a router from implementing other
   routing protocols in addition to OSPF.  Complete and definitive
   requirements on all aspects of an IP router will be found in a
   forthcoming Applicability Statement: "Requirements for IP Routers"

IAB                                                             [Page 1]

RFC 1370 Applicability Statement: OSPF October 1992 [4], currently in preparation in the IETF. "Requirements for IP Routers", when it becomes a Standard, will take precedence if its requirements for OSPF should conflict with this present RFC. It should be noted that OSPF is intended for use by routers for exchanging dynamic routing information, and not for use by hosts. As discussed in Section of STD-2, "Requirements for Internet Hosts -- Communication Layers" [3], 'wiretapping' of routing protocols by hosts is not recommended. Recommended mechanisms for a host to use for discovering local routers and detecting dead routers will be found in [3]. In particular, the ICMP Router Discovery messages, under development, will provide a standard way for a host to learn the addresses of local routers [6]. 3. REFERENCES [1] Moy, J., "OSPF Version 2", RFC 1247, Proteon, Inc., July 1991. [2] Baker, F., and R. Coltun, "OSPF Version 2 Management Information Base", RFC 1253, ACC, Computer Science Center, August 1991. [3] Braden, R., Editor, "Requirements for Internet Hosts -- Communication Layers", IETF, STD 3, RFC 1122, October 1989. [4] Almquist, P., Editor, "Requirements for IP Routers", Work in Preparation, IETF. [5] Gross, P., Editor, "Choosing a "Common IGP" for the IP Internet (The IESG's Recommendation to the IAB)", RFC 1371, IESG, October 1992. [6] Deering, S., Editor, "ICMP Router Discovery Messages", RFC 1256, Xerox PARC, September 1991. Security Considerations Security issues are not discussed in this memo. Author's Address A. Lyman Chapin BBN Communications Corporation 150 Cambridge Park Drive Cambridge, MA 02140 Phone: 617-873-3133 Fax: 617-873-4086 Email: Lyman@BBN.COM IAB [Page 2]

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