I 2nd A.Z., Go with a non-default kernel table you do not use for anything else, than installing the BH routes you need. & have bird import the kernel configured kernel tables BH routes. I have this exact setup. But instead of BH routes. I use it for propagating VM /32 & /128 routes internally in iBGP. (feasible, while the VM amount is low) On Thu, 7 Mar 2024 at 18:32, Alexander Zubkov via Bird-users <bird-users@network.cz> wrote:

Hi Robert,

You can import route from the kernel table and apply blackhole policy based on its parameters like krt_metric or something else. You can also import such routes from non-default kernel table and add it there temporarily.

Regards, Alexander

On Thu, Mar 7, 2024 at 5:10 PM Robert Blayzor via Bird-users <bird-users@network.cz> wrote:

...

Is there any possible way to interact with bird, ie: birdcl to add a non-persistent route into a routing table or is modifying the config and reload the only way?

Using some mitigation tools and need to add some external blackhole routes and today it seems the only way to do that is via adding them to a static route config file and reloading.

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