3 OSPF non-zero areas

Hi All,

  Is it possible to run OSPF when there are three OSPF areas as shown below
and none of them is not a area 0.

R1 --ospf area3 --R2 ---ospf area4 ---R3 ----ospf area5 --R4

My understanding is that, virtual-link would be only useful when to join a
non-zero area to connect to area0 which is seperated by another
non-zero area.Also the virtual links would be useful in case where area 0 is
broken in between a non-zero area.Assuming my above understanding is right,I
am thinking the above scenario will not be able to use virtual links to
propagate OSPF routes among R1,R2,R3,R4.

In this case,if I would be able to build GRE tunnel between
R1-R2,R2-R3,R3-R4 and run OSPF on area0 over them,In that case,will the OSPF
routes would be able to get propagated ?

Thanks for the help

Regards
Anantha Subramanian Natarajan

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Received on Tue May 05 2009 - 22:17:59 ART