From: Barney Gaumer (bagaumer@yahoo.com)
Date: Mon Sep 22 2003 - 14:26:09 GMT-3
Each OSPF speaker on a given network assumes themself
to be DR at the start of the election process.
Interfaces with a "IP OSPF Priority 0" dont
participate in the election process. DR goes to the
router who's interface has the highest priority on the
given network. Also, cost can play a role in this
(CCIE correct me on this if I'm wrong.) Lower cost is
better.
Once you "clear ip ospf proc" on DR or BDR, ospf
priority should take affect.
With that said, I have seen DR and BDR go back and
forth depending on which router you cleared the
process on, but this was in a redundant core and
redundant ABR scenario.
Thats my 2Cents,
Barney
--- "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com> wrote:
> make the other router a drother so it will never
> become the dr or bdr.
>
> ajaz
>
> -----Original Message-----
> From: Ken.Farrington@barclayscapital.com
> [mailto:Ken.Farrington@barclayscapital.com]
> Sent: 22 September 2003 18:04
> To: ccielab@groupstudy.com
> Subject: OSPF DR/BDR Election Question on Ethernet
>
>
> Peeps,
>
> Have a quick one.
>
> DR BDR
> rtr1 rtr3
> | |
> ------------------------------ Ethernet LAN A
>
>
> If I set the "ip ospf priority 2" on rtr1, this
> means that whenever I do a
> cle ip ospf proc on one of the routers, rtr1 should
> always come back as the
> DR?
>
> Or,
>
> Will the BDR become the DR regardsless of priority?
> So if R3 was the BDR,
> and i clear the adjs on rtr1, R3 now becomes the DR,
> R1 the BDR and the 2
> routers dont negotiate the priority field?
>
> If so, is there a way of ensuring that RTR1 always
> becomes the DR? I think
> not. It's just that I have an excercise that says
> "Ensure that RTR1 is the
> DR on LAN A.
>
> We I can do this if both routers come up at exactly
> the same time, but in
> reality, that will not be the case.
>
> Please can someone clarify as I am worried about
> getting this question in
> the exam.
>
> Many thx
>
>
>
>
>
>
>
>
>
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