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In the routing table, the neighbor's state is displayed, and if it shows a Full state, it indicates that the neighbors are fully adjacent, allowing routers to use the learned OSPF routes to forward traffic.
However, there are instances where no routes are visible even when the neighbor is in a Full state, as demonstrated in the following example.
get router info ospf neighbor
OSPF process 0, VRF 0:
Neighbor ID Pri State Dead Time Address Interface
10.10.10.1 1 Full/ - 00:00:30 10.7.251.252 x1
In this situation, it is important to verify the network type configured for the OSPF interface on both sides, ensuring that they match. For instance, if the FortiGate is set to broadcast, the neighboring device should also be set to broadcast.
An example configuration is below:
config router ospf
set router-id 0.0.0.1
config area
edit 0.0.0.0
next
end
config ospf-interface
edit "ospf"
set interface "x1"
set network-type broadcast
next
end
To debug routing communication, use the commands below:
diagnose debug disable
diagnose debug reset
diagnose ip router ospf all enable
diagnose ip router ospf level info
diagnose debug console timestamp enable
diagnose debug enable
diagnose debug disable --> To stop the debug:
Related article:
Technical Tip: How to configure OSPF over Non-Broadcast link
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