Re: ASBR Selection

Vincent,
The only selection of which router router id is used is when you have an
NSSA area. In that case the highest router id will be elected to translate
the LSA Type7s to Type5. But in this case you are talking about
redistribution, there is no election of which router redistributes, both
will do as long as each ASBR sees the EIGRP in their routing table. The
only thing you have to worry about in this case is that you have mutual
redistribution between two routing domains EIGRP and OSPF. I'm guessing you
had EIGRP external routes and only one OSPF router was advertising and
that's because it prefers the OSPF route instead of the EIGRP route (AD).
This is a classical redistribution problem. I would check out a lot of the
free material regarding redistribution, as you'll need to get a very
in-depth understanding of redistribution, which is very complex.

Regards,

Tom

On Mon, May 28, 2012 at 6:16 AM, Vincent Tay <vtay.75_at_gmail.com> wrote:

> Hi all,
>
> I have lab it up. Both ASBR is redistributing E2 cost 20 metric. However,
> the highest router-id wins does not apply. For example, if i clear ip ospf
> process on R3, R3 will be the ASBR. If i clear the other fellow R2, R2
> become ASBR. So, i was confused.
>
> Regards
>
> On Mon, May 28, 2012 at 8:59 PM, Tony Singh <mothafungla_at_gmail.com> wrote:
>
> > Is it not the case if we have two asbr's that we need to specify type 1
> in
> > redistribution this is enable router to make correct decision for packet
> > forwarding for the destination? Please correct me
> >
> > --
> > BR
> >
> > Sent from my iPhone on 3
> >
> > On 28 May 2012, at 11:13, oo IPX <oispxl_at_gmail.com> wrote:
> >
> > > and say R2 and R3 are receiving *E2 routes * then the *lower*
> > *forwarding
> > > metric path is chosen. *
> > >
> > > if one is E1 and other comes from E2, no matter what the cost is, E1
> will
> > > be preferred.
> > >
> > >
> > >
> > >
> > > On Mon, May 28, 2012 at 2:21 PM, 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.
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
> _______________________________________________________________________
> > >> Subscription information may be found at:
> > >> http://www.groupstudy.com/list/CCIELab.html
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > > _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Mon May 28 2012 - 08:11:56 ART