>Finally, I got it. The DR and BDR are per segment not per area. If an area
>has several segments, it has several DRs and BDRs as well.
>
>Am I right?
The OSPF terminology is confusing.
It would have been better to call the DR and BDR "designated
interface." You are correct thwt they are ideas for individual media.
"Internal," "Backbone," "Area Border," and "AS Border" are, loosely
speaking, attributes of "boxes". Since Cisco supports multiple OSPF
processes per physical box, the box could be an ABR in one process
and an ASBR in another. Indeed, a router can be both ABR and ASBR in
the same process.
If the router has...
1 or more interfaces in 1 nonzero area Internal
1 or more interfaces in area 0.0.0.0 only Backbone
1 or more in area 0.0.0.0 AND 1 or more in 1 or more
nonzero areas ABR
Produces type 5 or 7 LSAs through
redistribution under OSPF AND/OR
default-information originate ASBR
>
>Sorry for waisting your bandwidth.
>
>
>Daniel
>
>"Daniel Ma" <[EMAIL PROTECTED]> wrote in message
>8hpgv2$r6s$[EMAIL PROTECTED]">news:8hpgv2$r6s$[EMAIL PROTECTED]...
> > We all know that in an area (multi-access media), all routers must form
> > adjacency with DR and BDR. But how it is done if the router is not
>directly
> > linked to DR?
> > For example, Router A is the DR. Router B is between the Router A and
>Router
> > C. Now Router C must form adjacency with Router A. Am I right to say that
> > Router C multicast to 224.0.0.6, then Router B will forward this packet to
> > Router A? So actually it's a virtual adjacency between Router A and Router
> > C, they are not neighbor.
> > I really hope you would clear the concept for me, as I could not find the
> > answer in books, even in "Routing TCP/IP".
> >
> >
> > Thanks,
> >
> > Daniel
> >
> >
> > ___________________________________
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>
>
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