From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Mon Oct 21 2002 - 23:52:17 GMT-3
In short,
DR is only on broadcast and NBMA topology.
when u're in point to point and point to multipoint topology there is no such thing as DR.
Donny
"Scott Morris"
<swm@emanon.com> To: "'Hunt Lee'" <huntl@webcentral.com.au>, "'Tim Ross'" <ross2k@pclv.com>
Sent by: cc: <ccielab@groupstudy.com>
nobody@groupstudy Subject: RE: OSPF DR/BDR Election
.com
22-10-2002 10:19
Please respond to
"Scott Morris"
Try leaving it as a physical connection and do a 'show ip ospf
interfaces' and see what type it is. Then change it to
point-to-multipoint and do the same thing.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Hunt Lee
Sent: Monday, October 21, 2002 8:04 PM
To: 'Tim Ross'
Cc: 'ccielab@groupstudy.com'
Subject: RE: OSPF DR/BDR Election
Hello Tim & other guys,
Thanks for your explanations!!! What I don't understand is why do you
ask whether the hub is a physical or "point-to-multipoint" logical
connection? What difference does it make? It would be greatly
appreciated if you could elaborate on this ;-)
Anyway, I'm using Frame-Relay, & the hub is a physical interface, & so
are the spokes.
Best Regards,
Hunt Lee
-----Original Message-----
From: Tim Ross [mailto:ross2k@pclv.com]
Sent: Sunday, 20 October 2002 11:56 AM
To: Hunt Lee; ccielab@groupstudy.com
Subject: Re: OSPF DR/BDR Election
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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