From: Ahsan Mohiuddin (ahsan.mohiuddin@yahoo.com)
Date: Tue Mar 18 2008 - 05:10:12 ART
Hello Group,
in subject task, we have three ospf areas 17, 135, 34, with ABRs sitting between (17, 135) and (135,34).
The task states: "Without regard to network redundancy, use the minimal number of virtual links needed to support this OSPF domain." If I am not mistaken, its asking me to attain reachability across the entire ospf domain.
The solution guide shows a virtual link between the aforementioned ABRs. However, when I LABed it, the virtual link never comes up. I remember reading somewhere that at least 1 ABR has to be in Area 0, but in this case there IS no area 0.
My Solution? Multipoint GRE tunnel between the ABRs (actually the ABRs sit on a common NBMA net with a third ospf router.. all three of them in area 135, hence the multipoint tunnel) Apparently, it works.
I still don't know whether virtual-links could have been used instead, and perhaps in a more clean way. Any ideas?
Regards,
Ahsan
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