Case Study: A rapidly growing e-commerce company, 'GlobalCart', is expanding its network. They currently operate a single Autonomous System (AS 65001) with 20 routers in a full iBGP mesh. The network engineering team is struggling to manage the configuration complexity and the high number of TCP sessions. The company plans to add 30 more routers within the next year. All routers are in a single administrative domain and require full visibility of all external routes. The lead architect wants a solution that simplifies configuration, reduces the number of iBGP peerings, and avoids partitioning the AS into sub-ASes. Which BGP scaling solution should the architect implement to meet these requirements? ```mermaid graph TD subgraph AS65001 [Current Full Mesh (AS 65001)] R1 --- R2 R1 --- R3 R1 --- R4 R2 --- R3 R2 --- R4 R3 --- R4 R1 --- R20(...) R2 --- R20(...) R3 --- R20(...) R4 --- R20(...) end subgraph Future [Future Growth] R21(...) R50(...) end AS65001 --> Future ```

