CEF Issues ??

[asifsadikhov]

Can some one please explain me what are the demerits or what issues we need to take care of when we are going to enable ip cef, currently disabled..What about PBR, Policy maps and others issues as discussed here

http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00800ca6cf.html#1001509

(Check this section: Features that Affect_ MLS)

[carenas123]

CEF is a L3 IP switching technology that uses data structures called Forwarding Information Base (FIB) and adjacency tables for expedited packet forwarding. When distributed CEF (dCEF) is enabled, a copy of the FIB and adjacency tables are maintained on the line cards, enabling them to CEF switch packets between port adapters. This offloads the central route processor, resulting in improved performance.

For additional information, refer to the Verifying Cisco Express Forwarding Status on VIPs and LCs section of the following link :

http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a0080110d68.shtml