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Anycast & global traffic steering

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Walkthrough

BGP anycast to a nearby PoP

Cloudflare-class teaching: same service IPs from many cities; BGP picks entry; withdraw fails over. Cross-link `/architectures/cloudflare/`.

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nearbyClientPoP A (anycast)PoP B (anycast)Edge service

Identical anycast prefixes are announced from multiple cities. The client lands on a nearby PoP via BGP.

Walkthrough

Global Accelerator vs Front Door

Product-surface comparison: AWS Global Accelerator anycast to regional endpoints vs Azure Front Door edge entry / traffic acceleration — not identical mechanisms.

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anycast entryregional endpointClientGlobal AcceleratorAWS productAzure Front DoorRegional endpointOrigin / app

Global Accelerator documents anycast entry that maps to regional endpoints with product health checks.

Walkthrough

Anycast vs DNS vs BGP-informed steering

Three mechanisms: BGP anycast PoP entry, DNS/product routing (Fastly routing docs as example), Netflix Steering URLs informed by BGP prefixes.

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ClientAnycast PoPsame IP · BGPDNS / product routingNetflix SteeringOCA (BGP prefixes)CDN edge

Anycast: client packets hit a BGP-chosen PoP using the same service IP. Failover is withdraw/convergence — not URL reissue.