Applicability Statement for OSPF (RFC1370)
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
Internet Architecture Board: AUTHOR [+1]
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.
Network Working Group Internet Architecture Board
Request for Comments: 1370 Lyman Chapin, Chair
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  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.
2. APPLICABILITY OF OSPF
An IP router that implements any routing protocol (other than static
routes) is required to implement OSPF  and the OSPF MIB .
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"
, 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 188.8.131.52 of STD-2, "Requirements for Internet
Hosts -- Communication Layer...