When I run show protocol I don't see them. Are virtual interfaces supported by bird?
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# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 163.162.230.198 netmask 255.255.255.240 broadcast 163.162.230.207
inet6 fe80::2e:a6ff:fe66:5a27 prefixlen 64 scopeid 0x20<link>
ether 02:2e:a6:66:5a:27 txqueuelen 1000 (Ethernet)
RX packets 14271 bytes 996507 (973.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2746 bytes 314846 (307.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.200.8 netmask 255.255.255.0 broadcast 192.168.200.255
inet6 fe80::9034:56ff:feee:eeee prefixlen 64 scopeid 0x20<link>
ether 92:34:56:ee:ee:ee txqueuelen 1000 (Ethernet)
RX packets 16109 bytes 1066648 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7805 bytes 514801 (502.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.10.10.10 netmask 255.255.255.255 broadcast 10.255.255.255
ether 92:34:56:ee:ee:ee txqueuelen 1000 (Ethernet)
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 6 bytes 416 (416.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 416 (416.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo:1: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 163.162.35.89 netmask 255.255.255.255
loop txqueuelen 1 (Local Loopback)
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# birdc show interfaces
BIRD 2.0.2 ready.
lo up (index=1)
MultiAccess AdminUp LinkUp Loopback Ignored MTU=65536
::1/128 (Preferred, scope host)
eth0 up (index=2)
MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
fe80::2e:a6ff:fe66:5a27/64 (Preferred, scope link)
eth1 up (index=3)
MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
fe80::9034:56ff:feee:eeee/64 (Preferred, scope link)