Auto answering myself because the answer was alrady in the mailling
lists :
Just set nexthop=127.0.0.1 on the neighbor, then you can blackhole.
https://misc.openbsd.narkive.com/7jcjKEkQ/openbgpd-match-clause-with-multihop-bgp-session
Le 2018-11-23 16:16, Arnaud BRAND a écrit :
Hi misc@
Hi misc@ readers,
I have a question regarding the "set nexthop blackhole" nexthop
qualification in OpenBGPD 6.4 stable.
It looks like I have to add "nexthop qualify via default" in order for
the blackholed route to make it from the rib to the fib.
I understand this is standard behaviour
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