INTERNETWORKING WITH OTHER ROUTING PROTOCOLS
It is common to run OSPF and RIP in the same autonomous system. One approach is to assign a metric of one to each interface, which provides an almost least-hop count domain. I say almost because OSPF forces a path between two routers to be OSPF-based.
RFC 1745 defines the interactions between OSPF and BGP as well as the Inter-Domain Routing Protocol (IDRP). IDRP is an ISO/OSI variation of BGP, but has not enjoyed much success in the industry.
Most high-end routers support route distribution operations, which means any IP-based routing protocol information can be redistributed into any other IP-based routing protocol. In effect, OSPF can import or export routes via RIP, IS-IS, IGRP, and EIGRP for intradomain ...
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