why routers declaring themselves to be the DR cannot be elected BDR?

[huangzhy]

The election procedure of the DR and BDR says that routers declaring themselves to be the DR cannot be elected BDR.Why ?

[dtodd]

Hi:

I am assuming that you are refering to OSPF. If you want to elect a router to become the DR and not the BDR then you will need to use the ip ospf priority command in the interface:

ie:

int fe0/0

ip ospf prioritity 150

The higher the priority the more preferred it will be for becoming the DR. The higher the ip address the more preferred it will be for becoming the DR.

Use the ip ospf priority command to force a router to be a DR/BDR or 2way/other.

Let me know if you have other problems.

Thx.