From: Mike Kraus \(mikraus\) (mikraus@cisco.com)
Date: Sun Jul 01 2007 - 08:40:09 ART
Prior to 12.0, you could only process switch PBR. After 12.0, you can
use CEF, and also fast-switching. Fast-switching has the following
limitations:
"Fast-switched PBR supports all of the match commands and most of the
set commands, with the following restrictions:
- The set ip default next-hop and set default interface commands are not
supported.
- The set interface command is supported only over point-to-point links,
unless a route-cache entry exists using the same interface specified in
the set interface command in the route map. Also, at the process level,
the routing table is consulted to determine if the interface is on a
reasonable path to the destination. During fast switching, the software
does not make this check. Instead, if the packet matches, the software
blindly forwards the packet to the specified interface."
See:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/q
os_c/qcpart1/qcpolicy.htm
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Marko Milivojevic
Sent: Sunday, July 01, 2007 4:51 AM
To: louis john; Cisco certification
Subject: Re: What is the Real Story about CEF, Process Switching &
Policy Route?
> I have tested Policy Route when CEF is On and it is working fine, now
> I am confused because I saw many threads talking about sometimes
> switching it off and sometime on.
>
> Also I have read about the "ip route-cache policy" feature that made
> me confused more like what is the best practice ?
>
> The Real Story please
You could start here: http://www.cisco.com/warp/public/105/20.html
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