Re: ASBR Selection

Hi Mark/Tom,

Thanks. Finally, I have got the concept right. ASBRs (R3 and R2) will not
have any election. For EIGRP external routes (170), if R3 is the first to
redistribute, R2 will accept the OSPF routes from R3 since it has higher
admin distance (110) and its routing table will flush out its EIGRP
external (170) routes and thus will not be able ro redistribute the routes
back to R3. This process of operation will happen similarly if R2 is the
first to redistribute. So, it is a matter on the order of operation
process. Thanks for the enlightenment.

Data plane path calculation will be base on advertising router and FA if
present to the ASBR.

Regards

On Tue, May 29, 2012 at 12:52 AM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> There is no election. All ASBRs advertise routes that are redistributed.
> OSPF routers then calculate the best paths to those ASBRs or FA (if
> present) and chose which routes to use. External metrics are compared first
> though.
>
> --
> Marko Milivojevic - CCIE #18427
>
> :: This message was sent from a mobile device. I apologize for errors and
> brevity. ::
>
> On May 28, 2012, at 1:51, Vincent Tay <vtay.75_at_gmail.com> wrote:
>
> > Hi all,
> >
> > If there are two ASBRs redistributing routes, will there be any
> selection?
> > From what i have try, the router that i clear the ospf process will end
> up
> > advertising the type 5 routes. I am quite confuse with it.
> >
> > EIGRP
> > ____________________________________
> > | |
> > | |
> > | |
> > R3(ASBR)------------------------------R2(ASBR) !
> > Redistributing EIGRP into OSPF
> > | |
> > | |
> > | |
> > OSPF Area Routers
> > ___________________________________
> >
> > Thanks.
> >
> >
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Received on Tue May 29 2012 - 13:16:06 ART