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> The BDR Acronym
The BDR acronym stands for Backup Designated Router. In order to minimize the amount of information exchanged on a particular segment, OSPF elects one router to be a designated router (DR) and one router to be a backup designated router (BDR) on each multi-access segment.
Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.