Link State - The term link state refers to the status of a link between two routers.If the OSPF Router-ID is not configured manually, router uses one of the IP addresses assigned to the router as its Router-ID. Router-ID - IP address used to identify OSPF router.Point-to-point - Network type eliminates the need for DRs and BDRs.Broadcast - Network that allows broadcasting, for example Ethernet.Additional OSPF neighbor configuration is required for those networks. NBMA - Non-broadcast multi-access, networks allow multi-access but have no broadcast capability (for example X.25, Frame Relay).ASBR - Autonomous System Boundary Router, router connected to an external network (in a different AS).ABR - Area Border Router, router connected to multiple areas.Area - areas are used to establish a hierarchical network.BDR receives all routing updates from adjacent routers, but it does not flood LSA updates. BDR -Backup Designated Router, hot standby for the DR.DR - Designated Router, chosen router to minimize the number of adjacencies formed.LSA - Link State Advertisement, data packet contains link-state and routing information, that is shared among OSPF neighbors.Interface is considered as link, when it is added to OSPF. Interface - physical interface on the router. ![]() Link - link refers to a network or router interface assigned to any given network.No routing information is exchanged unless adjacencies are formed. Adjacency - logical connection between router and its corresponding DR and BDR.Neighbor - connected (adjacent) router that is running OSPF with the adjacent interface assigned to the same area.Term definitions related to OSPF operations. MikroTik RouterOS implements OSPF version 2 (RFC 2328) and version 3 (RFC 5340, OSPF for IPv6). more complex protocol to implement compared to RIP.OSPF is quite CPU and memory intensive due to SPF algorithm and maintenance of multiple copies of routing information.transfers and tags external routes injected into AS.logical definition of networks where routers are divided into areas.updates are sent only when network topology changes occur.multicast addressing is used to send routing information updates.OSPF is based on link-state technology that has several advantages over distance-vector protocols such as RIP: ![]() OSPF is Interior Gateway Protocol (IGP) and distributes routing information only between routers belonging to the same Autonomous System (AS). This chapter describes the Open Shortest Path First (OSPF) routing protocol support in RouterOS.
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