I even become more confused.
1. Routers must form adjacency to DR and BDR in an area;
2. Router C could not form adjacency to Router A (DR) because they are not
in the same segment.
Therefore,
1. Router C and Router A can not be in same area;
2. The two interfaces of Router B should not in same area.
Router A (DR) ------Router B-------Router C
I know there must be something wrong, anyone could help me?
Thanks,
Daniel
"Ryan Moffett" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> In your example, router C cannot form an adjacency to router A. It must
> form an adjacency with router B. The adjacency process will not even
occur
> as router C and router A will never become neighbors. They cannot become
> neighbors because they do not share the same IP segment. Since the HELLO
> packets are sent as multicast, router B will most likely not forward the
> multicast to router C. If router C were to somehow receive this HELLO
> packet the network portion of the source address would not match that of
> router C and the neighbor relationship will fail.
>
> Ryan
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Daniel Ma
> Sent: Thursday, June 08, 2000 9:30 PM
> To: [EMAIL PROTECTED]
> Subject: OSPF adjacency question
>
>
> 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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