From: Arun Kumar Arumuganainar (aarumuga@hotmail.com)
Date: Sun Jan 25 2009 - 08:31:40 ARST
Hi Mike
Actually PBR is not a CEF operation. CEF table only has information regarding
IP prefixes and their corresponding Layer2 Encapsulation ( Layer 2 Adjacencies
).
However there is a difference when they say PBR could be CEF Switched. This
mean that operation that are involved in PBR such are ACL matching , building
Layer 2 encapsulation information is done by CEF subsystem on the IOS .
It should be noted any feature implemented on CEF subsystem works faster. Code
base in CEF subsystem is much more leaner and hence execution requries less
CPU cycles.
Thanks and Regards
Arun
>
> On Wed, Jan 21, 2009 at 3:36 PM, Mike Lange <mikelange16@gmail.com> wrote:
>
> > Hello,
> >
> > we are trying to understand if PBR is CEF switched or not. Based on
> > this CCO document, PBR is CEF switched:
> >
> >
> >
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfpbr.html
> > #wp1005373
> >
> > Is this true? We see another DOC that contradicts and claims that by
> > default it's process
> > switched and can be configured to be fast switched:
> >
> >
> >
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfindep.htm
> > l#wp1001538
> >
> > Here's the main question. Our PBR is configured to match on ACL that
> > matches TCP ports
> > (not IP addresses). Would this traffic be process switched or CEF
> > switched? I'm told that it would be CEF switched. I don't understand
> > how CEF tables can store TCP port information.
> >
> > Thanks!!!
> >
> >
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