From: marvin greenlee (marvin@ccbootcamp.com)
Date: Fri Feb 04 2005 - 14:56:46 GMT-3
Is the first document based on an older IOS Version?
"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.
Note The ip route-cache policy command is strictly for fast-switched PBR
and, therefore, not required for CEF-switched PBR."
Cisco - QoS Config Guide 12.1 - Enabling CEF-Switched PBR -
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuratio
n_guide_chapter09186a00800c60d2.html#1002796
Marvin Greenlee, CCIE#12237, CCSI# 30483
Network Learning Inc
marvin@ccbootcamp.com
www.ccbootcamp.com (Cisco Training)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Roy
Dempsey
Sent: Friday, February 04, 2005 4:50 AM
To: Cisco certification
Subject: Confused with policy routing and cef [bcc][faked-from]
Importance: Low
Hi all,
I'm trying to understand the connection between 2 commands, and when
to use them, but I just can't get my head around it. The commands in
question are ip route-cache cef and ip route-cache policy. I
understood that if you were configuring policy routing on an
Interface, you needed to diable CEF, using no ip route-cache cef.
The documentation seems to back this up:
<SNIP> You might want to disable CEF or dCEF on a particular interface
because that interface is configured with a feature that CEF or dCEF
does not support. For example, policy routing and CEF cannot be used
together. </SNIP>
However, reading on I came across ip route-cache policy. This included
the following:
<SNIP> If Cisco Express Forwarding (CEF) is already enabled, the
present command isn't needed, because PBR packets are CEF switched by
default. </SNIP>
I think PBR and policy routing refer to same thing. One says you can't
use CEF, the other says CEF is the default. I'm obviously reading this
wrong.
Any ideas?
Thanks
Roy
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