Solved: service policy & CEF

gaurav.prakash · ‎07-10-2007

Hi,

Is it mandatory to have CEF enabled for proper functioning of policy-map applied on interface..

How & why ?

regards,

Gaurav

a.shaik · ‎07-10-2007

Hi Gaurav,

Please see this excellent document which explains why CEF is required.

http://www.cisco.com/en/US/tech/tk39/tk824/technologies_tech_note09186a0080094978.shtml

Hope this helps you

regards

Shaik ASSANA

View solution in original post

a.shaik · ‎07-10-2007

Hi Gaurav,

Please see this excellent document which explains why CEF is required.

http://www.cisco.com/en/US/tech/tk39/tk824/technologies_tech_note09186a0080094978.shtml

Hope this helps you

regards

Shaik ASSANA

mohammedmahmoud · ‎07-10-2007

Hi,

The link provided by Shaik ASSANA is very useful, in brief many useful class-based QoS features are supported only on routers that run CEF, ex: NBAR, CB-Marking, ..., and accordingly if you reqiure these features you'll need to run CEF.

HTH,

Mohammed Mahmoud.

vinay_verma80 · ‎07-10-2007

we use CEF because policy map is like access-list , and we have to transfer at wired rate

if we do in software it will slow down the router as it has to match very large no of packets

use command in global config mode

ip cef ( this is enable by default on all new router which support cef)