In an OSPF routing domain, two routers must be specified as one DR and one BDR in a broadcast or NBMA network with at least two routers.

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In OSPF, a Designated Router (DR) and a Backup Designated Router (BDR) are elected in broadcast and Non-Broadcast Multi-Access (NBMA) networks to reduce the amount of routing information exchanged and to ensure network stability.

In an OSPF Routing Domain, Two Routers Must Be Specified