When using the BGP module in Free Range Routing, the 'network The draw back to advertising connected prefixes is that the prefix is advertised even a related interface is not 'up'. This could lead to a blackhole scenario.
A better way to handle the advertisements of connected prefixes is to use the 'redistribute connected' command.
Even with the use of this command, there may be scenarios (which I need to test at some point) where the prefix is advertised or withdrawn depending upon the link state. Free Range Routing has an additional command which could be used to ensure link state checking: 'bgp network import-check'.
There is more about the Linux state checking flags in the
Why Link-State Matters presentation from LinuxCon 2015.
In addition, the Free Range Routing developers have brought together some
relevant sysctl settings.
Monday, April 30. 2018
Linux Link State and Free Range Routing
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