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Cisco Express Forwarding (2023 Edition)

Cisco Express Forwarding (2023 Edition)

CEF Deep Dive (commands) for IOS-XE C9300 used as example Model: C9300L-24UXG-4X Control Plane (CP) = R0 Data Plane (DP) = F0, UADP/ASIC CEF Background:  Why Cisco Express Forwarding (CEF)?  “Necessity is the mother of invention” -proverb Let’s take a trip in the networking time machine back to simpler times (late 80s, early 90s). I’m going to start with the fundamentals of software-based forwarding and all the pipeline steps involved. We didn’t have fancy ASICs like we do today, so everything was done…

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