Hi Gan,
There is nothing is CCEF which I am aware of.
CEF :- When Cisco Express Forwarding is enabled on a router, the Route Processor (RP) performs the express forwarding.(
isco Express Forwarding (CEF) is 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.
http://www.cisco.com/c/en/us/td/docs/ios/12_2/switch/configuration/guide/fswtch_c/xcfcef.html
http://routing-bits.com/2009/06/02/understanding-cef/
CEF was introduced on many platforms in Cisco IOS 12.0 mainline, particularly low- and mid-range platforms such as the Cisco 1600, 2500, and 3600 Series
(You can also check by using the command : show ip cef-- this would give you the info).
Dcef:-DCEF is distributed Cisco Express Forwarding. Normal CEF is where the supervisor engine holds the forwarding table and the adjacency/neighbour table and makes forwarding decisions for every line card. The main difference with dCEF is that each line card holds a copy of the neighbour table and forwarding table and can make forwarding decisions for itself. This takes burden of the Supervisor engine and speeds up packet forwarding
HTH
Regards
Inayath
*Plz rate if this info is usefull/helpfull.
