Most chances that BGP session was initiated from BIRD

cat /etc/issue
Ubuntu 18.04 LTS \n \l
uname -r
4.19.0-041900rc7-generic

#VRF vrf01
ipv4 table table_vrf01;

protocol kernel kernel_vrf01 {
        vrf "vrf01";
        kernel table 101;
        scan time 2;
        ipv4 {                            
                table table_vrf01;
                import none;    # Default is import all   
                export all;     # Default is export none
        };
        merge paths yes;
        learn on;               # Learn all alien routes from the kernel
}

protocol direct direct_vrf01 {
        vrf "vrf01";
        ipv4 { table table_vrf01; };    
        interface  "swp32.101";
        interface  "swp17.201";
        interface  "swp18.301";
        interface  "vrf01";
}

protocol static static_vrf01 {
        vrf "vrf01";
        ipv4 { table table_vrf01; };         
}

protocol bgp bgp_vrf01_n1 {
        vrf "vrf01";
        local as 65034;
        bfd yes;
        graceful restart;
        neighbor 191.34.1.4 as 65001;
        ipv4 {
                table table_vrf01;
                import all;
#                export all;
                export where source = RTS_BGP;
        };
}

protocol bgp bgp_vrf01_n2 {
        vrf "vrf01";
        local as 65034;
        bfd yes;
        graceful restart;
        neighbor 192.34.1.4 as 65001;
        ipv4 {
                table table_vrf01;
                import all;
#                export all;
                export where source = RTS_BGP;
        };
}

protocol bgp bgp_vrf01_ixia1 {
        local as 65034;
#        bfd yes;
        neighbor 190.34.32.101 as 65134;
        graceful restart;
        ipv4 {
                table table_vrf01;
                import all;
                export all;
        };
}

Don't have possibility to compile new version