Hi, bird user It seems that the image attachment cannot be seen by others, so I resend it ( I want to export 2602:feda:ab4::/48. I wrote 「if bgp_export() then accept」 in the BGP template, but it was not exported to BGP correctly. But bgp_export() outputs 2602:feda:ab4::/48. I can't find the BGP in the bird document under what circumstances will not export prefix, please tell me, thanks! bird> show route export Hurricane_Electric_LLC Table master6: 2a10:cc44:100::/44 unicast [UNM_Exch_RS2 2021-08-13 from 2602:ffb1:200:0:192:34:27:253] * (100) [AS38281i] via 2602:ffb1:200:0:192:34:27:6 on ens19 2a10:cc44:109::/48 unicast [LL_IX 15:22:24.526] * (100) [AS38281i] via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix 2001:df6:9f80::/48 unicast [EVIX_RS1 2021-08-13 from 2602:fed2:fff:ffff::1] * (100) [AS38281i] via 2602:fed2:fff:ffff::107 on ens20 2602:feda:ab2::/48 unicast [LL_IX 2021-08-15] * (100) [AS141011i] via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix bird> bird> show route where bgp_export() all Table master6: 2602:feda:ab2::/48 unicast [LL_IX 2021-08-15] * (100) [AS141011i] via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix Type: BGP univ BGP.origin: IGP BGP.as_path: 141011 BGP.next_hop: 2602:feda:ab2:5247:5247:5247:5247:5247 fe80::200:5efe:5bd:ff6b BGP.local_pref: 100 2602:feda:ab4::/48 unreachable [BGP_Prefix 2021-08-13] (200) Type: static univ bird> template bgp tpl_bgp { graceful restart on; local as LOCAL_ASN; ipv6 { next hop self; import filter peer_in_v6; #export where bgp_export(); export filter{ #if my_opt_prefix() then bgp_path.prepend(LOCAL_ASN); if bgp_export() then accept; if bgp_export_downstream() then accept; else reject; }; }; }