From: dusty (dushoan@yahoo.com)
Date: Tue Feb 20 2007 - 13:29:53 ART
good information to keep up to date. :) thanks a bunch.
alexandros.sichlimiris@bt.com wrote: Take a look here (requires partner access):
http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1835/products_
configuration_guide_chapter09186a008075fae6.html#wp1001019
For those with no partner access:
"IP PBR can now be fast-switched. Prior to Cisco IOS Release 12.0, PBR
could only be process-switched, which meant that on most platforms the
switching rate was approximately 1000 to 10,000 packets per second."
There are restrictions in the above, most notably with the use of the
set interface command in the route map.
And
"Beginning in Cisco IOS Release 12.0, PBR is supported in the Cisco
Express Forwarding (CEF) switching path. CEF-switched PBR has better
performance than fast-switched PBR and, therefore, is the optimal way to
perform PBR on a router. No special configuration is required to enable
CEF-switched PBR. It is on by default as soon as you enable CEF and PBR
on the router."
Cheers,
Alex
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
dusty
Sent: 20 February 2007 15:05
To: Ivan Ivanov; Richard Dumoulin; ccielab@groupstudy.com
Subject: Re: RE : Traffic engineering question
when you enable policy base routing, all the layer-3 packets need to go
to the CPU for routing processing (process switching) so you will need
to disable cache switching (cef and fast switching). fast switching and
cef forward packet base on FIB and adjacent table which include layer-2
header. only the first packet of fast and cef switching is process
switching.
hope this help. dusty
Ivan Ivanov wrote:
Hello,
I am not sure that you should disable cef for PBR, most possibly not.
Cef should be disabled, when you want to see the packets passing
through the router with "debug ip packet".
There are many things that don't work without cef, like Unicast
Reverse Path Forwarding like MPLS/ldp and other
This is from me :)
On 2/20/07, Richard Dumoulin wrote:
> Never unless you hit a bug.
> Where did you get that you need to disable cef for PBR?
>
> Regards
>
> -- Richard
>
> -----Message d'origine-----
> De : nobody@groupstudy.com [mailto:nobody@groupstudy.com]
> Envoyi : Tuesday, February 20, 2007 2:04 PM
> @ : ccielab@groupstudy.com
> Objet : Traffic engineering question
>
> When I configure routing policy on interface as follows:
>
> inter fa0/0
> ip policy route-map MAP
> command "no ip route-cache cef" is required.
> Could someone tell me : Which kind of situation I need disable
route-cache cef"
> Thanks
>
>
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