DR of ospf

[leungcm]

Hi,

base on the cisco doc, there is only one DR/BDR in segment. If we had ospf, the setting is as following:

router ospf 10

network 192.168.10.0 0.0.0.255 area 0

network 192.168.15.0 0.0.0.255 area 0

network 192.168.18.0 0.0.0.255 area 0

network 192.168.22.0 0.0.0.255 area 0

network 192.168.25.0 0.0.0.255 area 0

Does it mean that there is one DR on 192.168.10.o segment, one DR on 192.168.15.0 segment .....

it has 5 DR totally. Is it correct?

Best regards

[Richard Burts · Accepted solution]

We might need to qualify it a bit, but essentially yes you are correct that there would be 5 DR.

If the 5 network statements correspond to 5 interfaces (what if there were a 192.168.10.0/25 and 192.168.10.128/25 - they would both match to the first network statement and each could have a DR) and if each of the interfaces are a network type that elects DR, then yes there would be 5 DR.

HTH

Rick

[deveshkumar]

Hi

if the network u specified is point-to-point network interfaces than u have no DR here also.

If the interfaces are boradcast medium -e.g Lan...then u need one DR nad one BDR on each segments i.e. 5 in yur case.