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Webcast-Catalyst9k
New Member

ip cef

If I enable this on my router, will it make any performance difference ?

3 REPLIES

Re: ip cef

yes carl...

its express forwarding so definetly it will increase your performance...

regards

Devang

New Member

Re: ip cef

do this make it use memory rather than process ?

Bronze

Re: ip cef

CEF offers the following 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 distributed CEF (dCEF) mode is active.

* Resilience?CEF offers unprecedented level of switching consistency and stability in large dynamic networks. In dynamic networks, fast switching cache entries are frequently invalidated due to routing changes. These changes can cause traffic to be process switched using the routing table, rather than fast switched using the route cache. Because the Forwarding Information Base (FIB) lookup table contains all known routes that exist in the routing table, it eliminates route cache maintenance and the fast switch/process switch forwarding scenario. CEF can switch traffic more efficiently than typical demand caching schemes.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/switch_c/xcprt2/xcdcef.htm#17213

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