Hi, I have very buggy network with bird and OSPF, I try not restart bird daemon to catch the bugs: 1) on some router, birdc show ospf topology all change constantly See attached file 2) Route A (emit route to X.X.X.X) <-> Router B <-> Router C (Bug received route to X.X.X.X via B) on router B I put export filter protocol ospf main { import all; export filter { #STARTEXPORTFILTER if net = X.X.X.X/32 then reject; #STOPEXPORTFILTER accept; }; It's complex network with multiple router, and edge router have BGP. Cheers, -- alpha_one_x86/BRULE Herman<alpha_one_x86@first-world.info> Main developer of Supercopier/Ultracopier/CatchChallenger, Esourcing and server management IT, OS, technologies, research & development, security and business department