CHAPTER
24-1
Software Configuration Guide—Release 12.2(25)EW
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24
Configuring Cisco Express Forwarding
This chapter describes Cisco Express Forwarding (CEF) on the Catalyst 4500 series switch. It also
provides guidelines, procedures, and examples to configure this feature.
This chapter includes the following major sections:
• Overview of CEF, page 24-1
• Catalyst 4500 Series Switch Implementation of CEF, page 24-3
• CEF Configuration Restrictions, page 24-6
• Configuring CEF, page 24-6
• Monitoring and Maintaining CEF, page 24-8
Note For complete syntax and usage information for the switch commands used in this chapter, refer to the
Catalyst 4500 Series Switch Cisco IOS Command Reference and related publications at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/index.htm.
Overview of CEF
This section contains information on the two primary components that comprise the CEF operation:
• Benefits of CEF, page 24-1
• Forwarding Information Base, page 24-2
• Adjacency Tables, page 24-2
Benefits of CEF
CEF is advanced Layer 3 IP switching technology that optimizes performance and scalability for large
networks with dynamic traffic patterns or networks with intensive web-based applications and
interactive sessions.
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