Chapter 4. Cisco Express Forwarding Overview
Cisco Express Forwarding (CEF) is an advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions.
CEF offers these benefits:
Improved performance—CEF is less CPU-intensive than fast-switching route caching. More CPU processing power can be dedicated to Layer 3 services such as quality of service (QoS) and encryption.
Scalability—CEF offers full switching capacity at each line card when dCEF mode is active.
Resilience—CEF offers unprecedented level of switching consistency and stability in large dynamic networks. ...
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