Prefix to blackhole

Hi! I want to be able to set a router prefix via bgp to blackhole. What I have is this: if ((my_as, 666) ~ bgp_community) then { print "blackhole '", net, "' from AS", bgp_path.last, " via AS", bgp_path.first, " [", proto, "]"; # set nexthop blackhole; # bgp_next_hop blackhole; bgp_community.delete((my_as, 666 )); return false; } but either set nexthop or bgp_next_hop works. Is this possible in bird? -- //fredan