Enabling CEF Question

Question:

Hey, would WS-C3750X-48T-L  it be a wise move, to enable CEF on the WAN interface going to the Internet, if cef memory is currently at 98%.

AS of right now, this interface is process switching. The other two interfaces are cef switching.   

Answer:

I agree with Rick.

Your router will work better with CEF enabled on all interfaces.

About memory usage by CEF: your device is a SW based router that already has built a CEF table to be used for CEF switching. The table is populated by routing information ( topology driven) so adding the third interface to CEF should not cause a big increase in memory usage as the CEF table is already built and you should be able to see lower CPU usage with all interfaces running CEF.

Original comes from http://www.3anetwork.com/cisco-ws-c3750x-48t-s-price_p104.html