Re: ospf virtual link

As you said " I read that the transit area between two ABR's when a
virtual link is formed must be a stub area"

You cannot create virtual link over the stub area. you need to create
GRE tunnel to run over OSPF if the area is stub. Transit area should
be normal area to create virtual link

Regards,
Anser

On Fri, Feb 26, 2010 at 8:24 AM, <kebramccie_at_gmail.com> wrote:
> Hello karthik,
>
> As for the loop between two Abrs depends on your scenario. At most times what we c wit virtual links is that they are configured between abrs of diff areas.
>
> A virtual link is just an extension of area 0. The backbone. And remeber all areas must atleast have a single link to area 0 as it is through the area that all lsas are exchanged between areas..
>
> HTH
>
> Kabir
> ------Original Message------
> From: karthik thatikonda
> Sender: nobody_at_groupstudy.com
> To: ccielab_at_groupstudy.com
> ReplyTo: karthik thatikonda
> Subject: ospf virtual link
> Sent: Feb 25, 2010 04:54
>
> Hi GS,
>
> I read that the transit area between two ABR's when a virtual link is formed
> must be a stub area. One thing that stucks my mind is that the two ABR's
> would advertise Type 3 summary lsa for the default route into the transit
> area. Therefore, there is a loop here since the default route is advertised
> into the same area twice. Is this thinking correct? Can anyone clearly
> elaborate why the transit area must not be a stub area when we form a
> virtual link. Honestly, I haven't checked the archives but if there is one
> posted already please ignore and I will try to find it.
>
>
> Thanks.
>
> Karthik
>
>
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Received on Fri Feb 26 2010 - 19:34:53 ART