From: Joseph Brunner (joe@affirmedsystems.com)
Date: Mon Jul 21 2008 - 05:01:30 ART
When we enable cef globally, cef is enabled on every interface, just keep
that in mind...
If you disable cef on an interface "no ip route-cache cef", the fast
switched path is used, unless a feature is used that causes the process path
be used to forward traffic (fragments, crypto without an accelerator come to
mind), or "no ip route-cache" was also configured. We often do this to be
able to see traffic with the "debug ip packet" command.
You also disable cef switching by using a feature such as policy routing,
which forces the fast switch path or the process path depending on the ios
revision, and the platform.
Also keep in the mind the input interface setting determines if a packet is
cef switched or otherwise. It can get pretty complex from here on out...
Check out this paper, should clear things up...
"How to Verify Cisco Express Forwarding Switching"
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_tech_note091
86a00801e1e46.shtml
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Hash
Aminu
Sent: Monday, July 21, 2008 3:39 AM
To: Cisco certification
Subject: CEf vs IP route-cache on interfaces
Guys just a quick question, if you have fast switching enabled on interface
of a router and cef enabled globally what kind of switching will be used by
the router ..
TIA
Hash
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