QOS: When is CEF required

[gkirsch]

I understand CEF is required when using the "match protocol" under a class map. This basically turns on NBAR.

Is CEF required for rate limiting when using the DSCP keyword after conform-action or exceed action? also is CEF required for the "shaping" keyword under a policy map?

[Hieu Cao]

Here's some info pertaining to the requirement of having CEF for QoS.

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

If you use CBWFQ, then the answer is yes.

[gkirsch]

Thanks for the reply. That answers my question.