From: Tim Ross (ross2k@pclv.com)
Date: Sat Oct 19 2002 - 22:56:03 GMT-3
The highest ip ospf priority will be elected as DR as long as you are using
an OSPF network type that elects a DR. Are you using frame-relay? Is the hub
a physical or multipoint logical connection? Try this, put "ip ospf netw
broadcast" on all interfaces invove (hub and spokes). Put "ip ospf priority
200 on the Hub" and "ip ospf priority 0" on each of the spokes. This way you
are using "Ip ospf netw broadcast" type which elects a DR, and each of the
spokes can never become a BDR because they have priority 0.
Non-broadcast and Broadcast will elect a DR/BDR.
Point-to-point and point-to-multipoint will not.
Good luck,
Tim
----- Original Message -----
From: "Hunt Lee" <ciscoforme3@yahoo.com.au>
To: <ccielab@groupstudy.com>
Sent: Saturday, October 19, 2002 4:50 PM
Subject: OSPF DR/BDR Election
> Guys,
>
> I'm sure this question has been asked many times before, but can
> someone kindly explain to me again? There are 3 routers in a hub &
> spoke topology that I want to influence the DR election. And I'm doing
> this with "(config-router)# neighbor <x.x.x.x> priority <y>" command -
> I also tried "(config-if)# ip ospf priority <y>" command. I have been
> reloading the routers (as well as taking down OSPF by "no router ospf
> <x>" & putting OSPF back on, and every time the DR, BDR & DROther is
> different.
>
> I have read Caslow & Jeff Doyle, they both agree that the router with
> the highest priority (on an interface basis) will be the DR for that
> subnet, while Parkhurst says that the router with the lowest non-zero
> priority will be elected the DR. So who is correct?? And why is the
> DR/BDR/DROther are different each time?
>
> Thanks in advance,
>
> Hunt
>
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