From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Wed Jun 29 2005 - 15:43:03 GMT-3
Apparently I had a dumb config problem on R7... Duhhh... It's working
now.
Either way, any way how to solve recursive routing situation I
presented?
Thanks
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gustavo Novais
Sent: quarta-feira, 29 de Junho de 2005 19:33
To: ccielab@groupstudy.com
Subject: OSPF Virtual Link and GRE tunnel.
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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