From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Wed Jun 29 2005 - 15:32:39 GMT-3
Hello group
I have a topology like this.
Area0--(R2)---Area25---(R5)---Area57----(R7)----Area78----(R9)
It showed up on a exercise in order to test Virtual-links etc.
I did it using vlink between R5 and R2 for area 57 reachability and a
vlink between R7 and R5 for area 78 reachability.
But I'd like to try the same topology using GRE tunnel between R7 and
R2.
If I extend Area 0 onto interface tunnel on R7, I get recursive routing
and the tunnel goes down. (OSPF will prefer intra area routes vs extra
area routes, so the preferred path to the tunnel destination is through
the tunnel itself, which shuts it down.
If I extend area 78 to R2 Tunnel, apparently all is well, but the
problem is that R5 starts complaining that
Received invalid packet: mismatch area ID, from backbone area must be
virtual-link but not found from 150.50.57.7, Ethernet0/0, even now that
area 78 is connected directly to area 0, and area 57 still has its vlink
on R5 to Area 0.
Any ideas why is the router R5 showing this behaviour? Any suggestions
how to correct it?
Thanks
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