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?
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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