Hi Lord!
I understood u r point. My doubt is a basic one. What is the philosophy
behind the concept of VLink and backbone connectivity(I believe they are
pretty inter related). Our main goal is to forward the data traffic. So if I
don't have a VLink, and don't connect Area3 to BB, still I will be able to
forward the data traffic. When u form a VLink between R1 and R2 say, the
basic reqiurement is u have a route in R1 to R2 and vice versa. U already
have a connectivity between them. If u want to forward some traffic from R1
to some destination, thru R2, then u can still do it without having a Vlink.
Pl. go thru Sina's reply and my questions to him also, so that u can get
more about my doubt.
Regards Subbu

-----Original Message-----
From: Mailing List [mailto:OSPFdiscuss.microsoft.com]On Behalf Of
Sivaguru Sankaridurg
Sent: Tuesday, July 03, 2001 11:48 PM
To: OSPFdiscuss.microsoft.com
Subject: Re: Doubt in Virtual Link

Hi subbu,

Vlink is very easy. Dont think abt it is being
complicated and all that.
If u have an area border router that cannot directly
connect to the Backbone as with Area 3 in the figure.,
then u will need to configure a Vlink between this ABR
and another ABR that is connected to the backbone.

That is all.
If this is done, OSPF routing protocol will treat the
area (ARea3 in this case) as though it is directly
connected to the backbone.

Bye
Siva

--- Subrat Mohanty <subratmFUTURE.FUTSOFT.COM> wrote:
> I have a basic doubt in Virtual Link. I am still not
> clear about the use or
> benifit of the VLink.
>
> Pl. Check RFC-2328 Fig-6. Sec-3.4. See the last line
> which states
>
> "Note that a failure of the line between Routers RT6
> and RT10 will cause the
> backbone to become disconnected. Configuring a
> virtual link between Routers
> RT7 and RT10 will give the backbone more
> connectivity and more resistance to
> such failures. "
>
> Anyway RT7 and RT10 are connected thru network-6 and
> all the routers are
> having this info so that when the link fails between
> RT6-RT10 fails they can
> still do the routing. What is the benifit of the
> Vlink?
>
> Can u pl. give me a scenario where I will have an
> advantage of a VLink?
>
> Regards Subrat

=====
----------------------------------------------------------------------------
----------------------------------------------
Sivaguru Sankaridurg
Graduate Student
Computer Science Department
Univeristy of California, Santa Barbara
www.cs.ucsb.edu/~srsiva
srsivacs.ucsb.edu

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