R1 and R6: OSPF
R6 and R10: EBGP
R13 sends the routing information to R14 via IBGP (if R13 and R14 are BGP routers)
R14 has the default route to the next BGP router (R13)
→ IBGP communication, or default route
R13 checks availability of Alice’s subnet in neighbour EBGP routers. R12 sends the routing information.
→ Always BGP solutions or default way to BGP router