Basic IP Connectivity and CEF Troubleshooting -- Chapter 4 of "Cisco Express Forwarding"

This chapter presents general troubleshooting used on Cisco IOS routers and switches as a first step in troubleshooting IP connectivity, from a CEF software-switching and command-line interface perspective.

About this chapter: This chapter presents the general troubleshooting used on Cisco IOS routers and switches as a first step in troubleshooting IP connectivity problems. CEF occasionally is the scapegoat for IP connectivity problems, and this chapter helps you verify whether CEF is the root cause of a particular IP connectivity problem. This chapter does not delve into platform specifics of troubleshooting CEF. The chapter simply approaches troubleshooting from a CEF software-switching and command-line interface (CLI) perspective. Most mid- to high-end routers and all Catalyst switches support distributed CEF (dCEF), or hardware switching.

About this book: Cisco Express Forwarding demystifies the internal workings of Cisco routers and switches, making it easier for you to optimize performance and troubleshoot issues that arise in Cisco network environments. This book addresses common misconceptions about CEF and packet switching across various platforms, helping you to improve your troubleshooting skills for CEF- and non-CEF-related problems.

Read the rest of Basic IP Connectivity and CEF Troubleshooting in this PDF.


Excerpted from Cisco Express Forwarding by Nakia Stringfield, Russ White, and Stacia McKee (ISBN: 1-58705-236-9) Copyright 2007, Cisco Press. All rights reserved.

This was first published in April 2007

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