Hi Rene,
I have followed the same config you have explained but it’s not working at all.
Refer to the below outputs.
IOU1#show run int lo0
Building configuration...
Current configuration : 61 bytes
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
end
IOU1#show run | s bgp
router bgp 1
bgp log-neighbor-changes
network 1.0.0.0
neighbor 192.168.12.2 remote-as 2
auto-summary
IOU1#show ip bgp summ
BGP router identifier 192.168.12.1, local AS number 1
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.12.2 4 2 24 24 1 0 0 00:18:17 0
IOU1#show ip bgp
IOU1#show ip bgp 1.0.0.0
% Network not in table
IOU1#