Hello, I would like announce routes differently via bgp (longer AS-Path) depending on, if carp(4) status is "master" or "backup". If the carp status is „Master“ Status the shows up as a kernel route to the carp(4) address. If carp is in "Backup“ status the route is removed. **Master Status for carp IP 10.8.15.254** bird> show route 10.8.15.254/32 all 10.8.15.254/32 dev lo0 [kernel1 00:06:42] * (10) Type: inherit unicast univ Kernel.source: 1 Kernel.metric: 0 bird> **Backup Status for carp IP 10.8.15.254** bird> show route 10.8.15.254/32 all Network not in table bird> If possible I would like to check in my bgp export filter if I have a kernel route to my carp address (10.8.15.254) and if possible if this route is via the loopback dev lo0 Is there any function to lookup a route in bird that could be used in the following scenario? filter bgp_export { if ( [ check_if_10.8.15.254/32 is via lo0] ) { bgp_local_pref = 120; accept; } else { bgp_path.prepend(65534); accept; } } Kind regards, Manon