The fail appears at 2:00 to 6:00 am when FTP traffic overloads the link, but it is normal. The comms were fine over 1 year ago until this month.
The only changes were routing redistribution betwen ospf and eigrp at the remote end and config of IPsec encryption over a GRE Tunnel (in order to permit the flow of routing traffic) on the main link (it´s an international FRelay link).
What´s the main reason for lose adj in this case?
Another important fact is that the lose ospf adj appears on neighbor associated with the Tunnel interface, not with the DLCI. Both have different ip address
Remember a tunnel is only a virtual interface not a physical pipe, you may have a physical pipe that is bouncing , what you can do is trace from to an interface that is in another ospf area on the other router , this will show you the physical path that it traverses , then run pings across all the hops , by doing this you can determine if you have a dirty circuit.
I wonder if the OSPF goes down just because the tunnel goes down...try and increase the keepalive timers on the tunnel to e.g. 10 2 and check if the OSPF adjacency still experiences the same problem. I usually also put the ip ospf mtu-ignore command on both sides of the tunnel configuration.
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