About This Architecture

ISP network topology implementing three-tier architecture with BGP routing at core, CGNAT load balancing, and PPPoE access. Huawei NE8000 BGP router peers with Internet and feeds Distribution Switch, which branches to dual MikroTik CCR routers for CGNAT client aggregation and Huawei NE8000 BNG for PPPoE subscriber termination. This design separates routing, address translation, and access functions across dedicated layers, enabling carrier-grade redundancy and subscriber scaling. Fork this diagram on Diagrams.so to customize IP addressing, add failover links, or model your own ISP access network. The dual-CGNAT architecture demonstrates load distribution best practices for high-volume residential broadband deployments.

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How do ISPs architect networks with BGP routing, CGNAT, and PPPoE for residential broadband access?

This diagram shows a three-tier ISP topology where a Huawei NE8000 BGP router handles Internet peering and core routing, dual MikroTik CCR routers provide CGNAT address translation for client aggregation, and a Huawei NE8000 BNG terminates PPPoE sessions. This separation enables redundancy, subscriber scaling, and efficient address space management.