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- Network Working Group Internet Architecture Board
- Request for Comments: 1370 Lyman Chapin, Chair
- October 1992
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- Applicability Statement for OSPF
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- 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.
-
- 1. INTRODUCTION
-
- 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
- [5].
-
- 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.
-
- 2. APPLICABILITY OF OSPF
-
- 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
- recommended.
-
- 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"
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- IAB [Page 1]
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- RFC 1370 Applicability Statement: OSPF October 1992
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- [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 3.3.1.4 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
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- [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
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- IAB [Page 2]
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