ISP Network Topology - BGP, CGNAT and PPPoE

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ISP network topology integrating BGP core routing, CGNAT edge processing, and PPPoE subscriber access across Huawei and MikroTik platforms. Internet traffic enters via BGP Core Router, distributes through Layer 2/3 switches to dual MikroTik CCR nodes handling CGNAT translation and a Huawei BNG managing PPPoE sessions. This three-tier architecture separates carrier backbone (BGP), aggregation (distribution switches), and subscriber edge (CGNAT + PPPoE) for scalability and redundancy. Network engineers can fork this diagram to customize for their ISP topology, add failover links, or document VLAN/QoS policies. The design demonstrates industry-standard ISP access patterns supporting both legacy PPPoE and modern CGNAT subscriber models simultaneously.

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How do ISPs architect networks with BGP core routing, CGNAT edge processing, and PPPoE subscriber access?

This diagram shows a three-tier ISP topology where BGP Core Router handles Internet peering, Distribution Switches aggregate traffic, and edge nodes split into MikroTik CCR (CGNAT) and Huawei BNG (PPPoE) for different subscriber types. This architecture enables ISPs to support legacy PPPoE and modern CGNAT subscribers with carrier-grade redundancy and traffic separation.

ISP Network Topology - BGP, CGNAT and PPPoE

AutoadvancedISPBGPCGNATPPPoEnetworkingHuawei
Domain: NetworkingAudience: ISP network engineers designing carrier-grade access networks
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Created by

April 8, 2026

Updated

April 8, 2026 at 1:41 AM

Type

er

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