CONEXAO BA ISP network topology spans core, services, and access layers with dual-stack BGP transit via MAX and ENFORTEL upstreams, Google CDN peering, and FTTH subscriber delivery through OLT aggregation. Data flows from Internet through border routers (Huawei NE8000) and CGNAT appliances (MikroTik CCR1036) to a BNG handling PPPoE authentication against RADIUS/IXC platforms, then down L2 distribution to GPON OLTs serving end users. The architecture documents current infrastructure while marking legacy Itamaraju POP equipment for decommission and planning future MPLS/L2VPN migration for centralized subscriber management. This topology demonstrates carrier-grade redundancy, service layering, and graceful infrastructure evolution critical for ISP reliability and cost optimization. Fork this diagram on Diagrams.so to customize for your own multi-POP network, add additional transit providers, or model your migration timeline. The design balances operational complexity with subscriber growth and upstream resilience.