From the course: Cisco CCNA (200-301) Cert Prep: 2 IP Connectivity and Services

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OSPF interface types and areas

OSPF interface types and areas

From the course: Cisco CCNA (200-301) Cert Prep: 2 IP Connectivity and Services

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OSPF interface types and areas

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- [Instructor] OSPF has per-interface designations that change the behavior of how OSPF operates on that given interface. Engineers nowadays will most often use ethernet connections, which default to a type of broadcast. On these broadcast networks, one of the routers will be chosen to be the designated router, or DR, and one will be the backup DR. All routers on the segment will exchange their LSDB only with the DR. If for some reason the DR fails, then the backup DR will assume the role of DR, and a new BDR will be elected. The process of using a DR and BDR adds efficiency to a busy OSPF network. When routers want to send messages to the DR or BDR, they do so via 224.0.0.6, which is the all SPF DR's multicast address. In these scenarios, there are three types of router. DR, BDR, and everything else is considered a DR other. While DR others will maintain neighborships with each other, they will stop at the two way state, as they will only form full adjacencies with a DR and BDR…

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