Introduction

How does a router switch a packet? What is the difference between routing a packet and switching a packet? What is this CEF feature that is referred to in Cisco documentation and commonly found in Cisco IOS commands? This book answers these questions through comprehensive discussions of Cisco Express Forwarding (CEF).

CEF is a term used to describe one of the mechanisms used by Cisco IOS routers and Cisco Catalyst switches to forward packets. Other packet-switching mechanisms include process switching and fast switching. CEF is found in almost all Cisco IOS routers and Catalyst switches. However, documentation of the topic is scarce. From a technical support perspective, CEF is a widely misunderstood topic whose implementation varies ...

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