Thursday, December 9, 2021

Response: Hardware Differences between Routers and Switches

Dmytro Shypovalov sent me his views on the hardware differences between routers and switches. Enjoy!

So, a long time ago routers were L3 with CPU forwarding and switches were L2 with ASIC. Then they had invented TCAM and L3 switches, and since then ASICs have evolved to support more features (QoS, encapsulations etc) and store more routes, while CPU-based architectures have evolved to specialised NPU and parallel processing (e.g. Cisco QFX) to handle more traffic, while supporting all features of CPU forwarding.


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