# How Backplane Bandwidth Shapes Modern Switch Design

Page: https://stenobird.com/podcast/networking-tech-with-fexingo-internet-infrastructure-routing-and-network-engineering-7871928/how-backplane-bandwidth-shapes-modern-switch-design
Text version: https://stenobird.com/podcast/networking-tech-with-fexingo-internet-infrastructure-routing-and-network-engineering-7871928/how-backplane-bandwidth-shapes-modern-switch-design.md
Podcast: [Networking Tech with Fexingo: Internet Infrastructure, Routing, and Network Engineering](https://stenobird.com/podcast/networking-tech-with-fexingo-internet-infrastructure-routing-and-network-engineering-7871928)
Published: 2026-07-17T10:16:43+00:00
Episode link: https://audio.fexingo.com/business/networking-tech/episode-0116.mp3
Audio file: https://audio.fexingo.com/business/networking-tech/episode-0116.mp3
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JSON: https://stenobird.com/v1/public/podcasts/networking-tech-with-fexingo-internet-infrastructure-routing-and-network-engineering-7871928/episodes/how-backplane-bandwidth-shapes-modern-switch-design
Duration seconds: 604

## Resource

Episode 116 of Networking Tech with Fexingo explores the often-overlooked role of backplane bandwidth in modern switch and router design. Lucas and Luna explain how internal fabric capacity dictates real-world throughput, using the example of a typical 100-gigabit-per-second port count versus actual forwarding capacity. They discuss the shift from shared-bus architectures to crossbar and Clos fabrics, and why oversubscription ratios matter more than raw port speeds. The episode also touches on how hyperscalers like Google and Microsoft design custom switches to match their specific traffic patterns, and how the industry is moving toward 51.2-terabit-per-second switch ASICs. A practical anchor: why a 48-port 25-gig switch with 12.8 terabit-per-second backplane can still bottleneck under heavy east-west traffic. #BackplaneBandwidth #SwitchDesign #NetworkEngineering #DataCenterNetworking #ClosFabric #Oversubscription #SwitchASIC #100Gigabit #Hyperscaler #GoogleNetwork #MicrosoftNetwork #EastWestTraffic #NetworkArchitecture #TechPodcast #FexingoBusiness #BusinessPodcast #InternetInfrastructure #RoutingAndSwitching Keep every episode free: buymeacoffee.com/fexingo

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