Im trying understand hot-potato routing better using this diagram that I have made. It shows R1 and R2 in automous system 1 (AS1) are receiving full routes from their parent providers P1 and P2 respectively. Both R1 and R2 are also injecting a 0/0 default route inside AS1. The T3 link at R2 is configured as the primary link and the T1 link at R1 is used as a backup so all outbound traffic will exit the AS through R2. Interior routers R3, R4, and R5 don't see external routes and simply follow Hot Potato Routing by forwarding all packets to the nearest exit point.
It this topology effective/prone to errors if it uses hot potato routing?