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A problem in BIRD-Linux kernel routing table synchronization when BIRD tries to
overwrite an existing kernel route. There are two common causes:
First, there are some routes in the kernel routing table added by some other
tools (like ip or route commands). BIRD does not purge such routes during
its start. You could either do not add such routes, or configure BIRD kernel
protocol to learn such routes (option learn) and make them preferred (change
preference of kernel protocol to higher value)
Second, BIRD tries to overwrite kernel's device route by its own (common,
non-device) route. This might happen unintentionally if OSPF is configured with
strongly asymetric costs for local interfaces - the path through another router
is cheaper than the direct connection. In that case you could either change OSPF
costs, or import device routes from direct protocol with highest priority.
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