[61939] in North American Network Operators' Group
RE: cef/process switching problem
daemon@ATHENA.MIT.EDU (Michel Py)
Wed Sep 10 14:09:13 2003
Date: Wed, 10 Sep 2003 11:08:25 -0700
From: "Michel Py" <michel@arneill-py.sacramento.ca.us>
To: "Austad, Jay" <JAustad@temgweb.com>, <nanog@merit.edu>
Errors-To: owner-nanog-outgoing@merit.edu
> Jay Austad wrote:
> I've got a cisco MC3810 with a bunch of DSL customers on it.
> CEF is enabled, but when I do a show int stat, I see that almost
> 100% of the outbound packets on the ethernet interface are
> process switched, and not being matched in the route cache.
> The Input looks just fine, and the other interfaces are
> borderline (usually 50% hit rate on the cache or a little
> less).
> CPU is sitting pretty high on this box during the day, and I
> have strong suspicions that this is why. :)
> I can't seem to find any info on why this would be happening
> or how to figure out what's going on. Anyone have any
> suggestions?
I just troubleshoot something similar on a 7500 and it turned out that
the culprit was the "traffic-shape rate" interface command. Using
"rate-limit output" instead solved it. Whether or not this is your
issue, it's likely to be an interface-level setting on the egress
Ethernet interface.
Michel.
