07-10-2007 01:41 AM - edited 03-03-2019 05:47 PM
Hi,
Is it mandatory to have CEF enabled for proper functioning of policy-map applied on interface..
How & why ?
regards,
Gaurav
Solved! Go to Solution.
07-10-2007 01:58 AM
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
07-10-2007 01:58 AM
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
07-10-2007 02:49 AM
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.
07-10-2007 04:04 AM
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)
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