Hello community!! * Sorry, in original mail (filters: strange protocol restarts) I fogot * to add kernel20 configuration. And again I need to spread some light on BIRD behavior: why bird restarts protocol instead of just reloading it when no filter changes in configuration when using prefix set constant? There is simple configuration and steps to reproduce this ------------------------------------------------------------------------- # Configure logging log syslog all; log stderr all; router id 172.16.1.1; protocol device devices { scan time 15; } ### KRT 10 table rt_10; # This function does not forces "kernel" protocol to reload. function f1(prefix pfx) { if pfx ~ [ 192.168.0.0/16+ ] then return false; return true; } protocol kernel kernel10 { table rt_10; persist no; scan time 15; learn yes; device routes yes; kernel table 10; import where f1(net); export none; } ### KRT 20 table rt_20; # And this does, "kernel" protocol restarts without changing PS_1. define PS_1 = [ 192.168.0.0/16+ ]; function f2(prefix pfx) { if pfx ~ PS_1 then return false; return true; } protocol kernel kernel20 { table rt_20; persist no; scan time 15; learn yes; device routes yes; kernel table 20; import where f2(net); export none; } There is nothing difficult in config: 2 functions f1() and f2() that do same thing except f2() matches specified as parameter prefix to a defined constant of type prefix set (PS_1). Starting bird, and invoking three times on console command to reconfigure bird (birdc configure) without altering configuration file I get following in my syslog: -------------------------------------------------------------------------------- Aug 21 18:50:54 gw1 bird: Started Aug 21 18:50:59 gw1 bird: Reconfiguring Aug 21 18:50:59 gw1 bird: Reloading protocol kernel20 Aug 21 18:50:59 gw1 bird: Restarting protocol kernel20 Aug 21 18:50:59 gw1 bird: Reconfigured Aug 21 18:51:08 gw1 bird: Reconfiguring Aug 21 18:51:08 gw1 bird: Reloading protocol kernel20 Aug 21 18:51:08 gw1 bird: Restarting protocol kernel20 Aug 21 18:51:08 gw1 bird: Reconfigured Aug 21 18:51:08 gw1 bird: Reconfiguring Aug 21 18:51:08 gw1 bird: Reloading protocol kernel20 Aug 21 18:51:08 gw1 bird: Restarting protocol kernel20 Aug 21 18:51:08 gw1 bird: Reconfigured Same thing can be reproduced with other protocols. This is not wery good to restart protocol when no REAL things changed in its filter, as it purges all routes from kernel table, and reinstalls them again causing flap when huge number of routes needed to be reinstalled. Can some one explain to me this behavior of BIRD? Does this mean that usage of constats with type prefix set is not recommended? Thanks for your support. -- SP5474-RIPE Sergey Popovich