Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > Backup Designated Router (BDR) > Role of the BDR > The Role of the Backup Designated Router (BDR)
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Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > Designated Router (DR) > DR Failures > The Role of the Backup Designated Router (BDR)



The Role of the Backup Designated Router (BDR)


OSPF includes the concept of a Backup Designated Router (BDR) on each subnet, so when the Designated Router (DR) fails or loses connectivity to the subnet, the BDR can take over as the DR. (All routers except the DR and BDR are typically called "DROther" in the IOS "show" command output.)







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.