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Updates the documentation.
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@ -1654,6 +1654,15 @@ use cases that use the direct protocol (like abusing eBGP as an IGP
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routing protocol), in most cases it is not needed to have these device
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routes in BIRD routing table and to use the direct protocol.
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<p>There is one notable case when you definitely want to use the
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direct protocol -- running BIRD on BSD systems. Having high priority
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device routes for directly connected networks from the direct protocol
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protects kernel device routes from being overwritten or removed by IGP
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routes during some transient network conditions, because a lower
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priority IGP route for the same network is not exported to the kernel
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routing table. This is an issue on BSD systems only, as on Linux
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systems BIRD cannot change non-BIRD route in the kernel routing table.
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<p>The only configurable thing about direct is what interfaces it watches:
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<p><descrip>
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