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Attention: The Cisco Support Community site will be in read only mode on Dec14, 2017 from 12:01am PST to 11:30am for standard maintenance. Sorry for the inconvenience.

New Member

OSPF. 2 BDR

Good day!

Can anyone explain me, why in my network topology, where OSPF is running, i have 2 BDR router, instead of have 1 BDR and one DROTHER.

On DR router i have following output:

CENTRE#show ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

172.16.10.150     1   FULL/BDR        00:00:31    192.168.10.1    FastEthernet0/0

172.16.10.50      1   FULL/BDR        00:00:33    192.168.10.10   FastEthernet0/1

Thanks:)

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Cisco Employee

OSPF. 2 BDR

Hello Dmitri,

A DR/BDR is elected for each multiaccess network, not for the network as a whole. You have two FastEthernet interfaces and hence (at least) two multiaccess networks. On each of these networks, DR and BDR must be elected. That is why you see two BDRs - because each of them serves a different multiaccess network. This is normal.

Best regards,

Peter

2 REPLIES
Cisco Employee

OSPF. 2 BDR

Hello Dmitri,

A DR/BDR is elected for each multiaccess network, not for the network as a whole. You have two FastEthernet interfaces and hence (at least) two multiaccess networks. On each of these networks, DR and BDR must be elected. That is why you see two BDRs - because each of them serves a different multiaccess network. This is normal.

Best regards,

Peter

New Member

OSPF. 2 BDR

Ok, thanks o lot:)

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