From: Alan Kucharski (akuchars@cisco.com)
Date: Mon Oct 21 2002 - 22:08:09 GMT-3
It is also dependent on what order the routers initalized onto multiple
access media, what you're seeing could be a function of that.
If a router with a 100 priority came up first, it will be the DR,
irrespective of a 200 priority router coming up later. Only if there's a
re-election, say if the DR router went away, will the 200 priority router
(if it's still the highest) be elected DR.
It's covered in Doyle I.
-Alan.
-----Original Message-----
From: Kris Keen [mailto:kkeen@bigpond.net.au]
Sent: Monday, October 21, 2002 5:37 PM
To: Hunt Lee; 'Tim Ross'
Cc: ccielab@groupstudy.com
Subject: Re: OSPF DR/BDR Election
Hunt
Because on different ospf topologies, some cases a DR isnt elected (ie p2p
or multipoint)
Regards
Kris
----- Original Message -----
From: "Hunt Lee" <huntl@webcentral.com.au>
To: "'Tim Ross'" <ross2k@pclv.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, October 22, 2002 10:03 AM
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
> >
> > http://careers.yahoo.com.au - Yahoo! Careers
> > - 1,000's of jobs waiting online for you!
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