Cisco Express Forwarding

Cisco Express Forwarding

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Cisco Express Forwarding Understanding and troubleshooting CEF in Cisco routers and switches Nakia Stringfield, CCIEAr No. 13451/Russ White, CCIE No. 2635/Stacia McKee How does a router switch a packet? What is the difference between routing a packet, switching a frame, and packet switching? What is the CiscoAr Express Forwarding (CEF) feature referred to in Cisco documentation and commonly found in Cisco IOSAr commands? CEF is a general term that describes the mechanism by which Cisco routers and CatalystAr switches packet-switch (route) frames. CEF is found in almost all Cisco routers and Catalyst switches, and understanding how CEF operates can improve the performance, scalability, and efficiency of your network. 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. The first part of the book provides an overview of packet-switching architectures and CEF operation and advanced features. It also covers the enhanced CEF structure and general troubleshooting. The second part of the book provides case studies that focus on the common topics that have been problematic for customers and those supporting Cisco networks. Full of practical examples and configurations, this book draws on years of experience to help you keep your Cisco networks running efficiently. Learn the key features of packet-switching architectures Understand the basics of the CEF architecture and operation Examine the enhanced CEF structure, which improves scalability Learn how to troubleshoot in software-switching environments Understand the effect of CEF on a Cisco Catalyst 6500 Supervisor 720 Configure and troubleshoot load sharing with CEF Evaluate the effect of CEF in an MPLS VPN environment Review CEF design considerations that impact scalability This book is part of the Networking Technology Series from Cisco PressAr, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers. Category: Networking Covers: Routing and SwitchingOn Cisco 12000 series routers, each line card makes independent forwarding decisions using hardware-based CEF tables. Therefore, the route calculated in software and viewed using the show ip cef exact-route alt;srcagt; alt;dstagt; command ... Originally, on a Cisco Catalyst 6500 with a SUP720, load sharing was available only in the IP-to-label and the ... Asati, R., Troubleshooting MPLS VPN Networks, Networkers 2004, networkers/nw04/presos/docs/RST-3605.pdf.

Title:Cisco Express Forwarding
Author:Nakia Stringfield, Russ White, Stacia McKee
Publisher:Pearson Education - 2007-04-24


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