Sina, Vishwas, Schhrre, Siva!
Thanks a lot for helping me out.

Sina!
I have a couple more doubt.

    A1 A2 A3
----------R1-----------R2----------
    N1 N2 N3

1. R1 is in A1 and A2 and R2 is in A2 and A3. So both of them are ABR. But
none of them are connected to BB Area. As u said ABR will consider the
Summary Lsa only from BB, does it mean that R1 will not have the info about
N3 and R2 about N1? ( I thought R2 will be summerising A2 about N3 and R1
will be having the info about N3).

2. I am able to configure virtual link between R1 and R2 without having an
interface(neither R1 nor R2) connected to BB Area (Checked with Cisco also).
For configuring a virtual link between R1 and R2, don't we require one of
the 2 routers to be connected to BB area ? I believe that a router will be
connected to BB area only if one of the interface lies in BB or a Virtual
link is established with a remote router, where the remote router is
connected to BB. Pl. let me know if I am wrong any where.

Regards Subrat

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