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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