here is the relative info from rfc 1247
3,4 Summary link Originated by area border routers, and
advs. flooded throughout their associated
area. Each summary link
advertisement
describes a route to a destination
outside the area, yet still inside
the
AS (i.e., an inter-area route).
Type 3
advertisements describe routes to
networks. Type 4 advertisements
describe routes to AS boundary
routers.
""Priscilla Oppenheimer"" a icrit dans le message de
news: [EMAIL PROTECTED]
> ericbrouwers wrote:
> >
> > Hi,
> >
> > For those that are reading Cisco Press' CCNP Routing Exam
> > Certification Guide:
> > there is a very confusing definition of type 4 summary LSAs on
> > page 292,
> > chapter 6:
> >
> > The AS external ASBR summary link- This LSA is sent to a router
> > that connects
> > to the outside world (ASBR). It is sent from the Area Border
> > Router to the
> > Autonomous System Boundary Router. The LSA contains the metric
> > cost from the
> > ABR to the ASBR. This is identified as a Type 4 LSA.
> >
> > In my opinion this is wrong, isn't it? Or maybe I'm missing
> > something?
> >
> > My understanding is that a type 4 summary LSA is originated by
> > ABRs.It is sent
> > into an area by the ABR to advertise the AS boundary routers.
> >
> > Could someone confirm my understanding?
>
> Yup, I have the same comment penciled into my copy of the book.
>
> Bottom line: don't even bother trying to learn OSPF from that book. It's a
> disaster. (It's a pretty good book otherwise, I think?)
>
> Read "Routing TCP/IP" by Doyle. You'll want to get that book anyway if you
> haven't already It's terrific for real-world and certs.
>
> _______________________________
>
> Priscilla Oppenheimer
> www.troubleshootingnetworks.com
> www.priscilla.com
> >
> > Eric Brouwers
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