nanog mailing list archives

RE: cef/process switching problem


From: "Austad, Jay" <JAustad () temgweb com>
Date: Tue, 9 Sep 2003 10:33:54 -0500


It's 12.2 code.  show ip int e0 shows that CEF is enabled on the interface.
Supposedly 12.2's CEF also handles policy routing (which is not being used
on this router).  

-----Original Message-----
From: Jason Frisvold [mailto:friz () corp ptd net]
Sent: Tuesday, September 09, 2003 10:24 AM
To: Austad, Jay
Cc: nanog () merit edu
Subject: Re: cef/process switching problem


Not sure on the MC3810 (never used one), but I know that many of the
other Cisco routers didn't do CEF on ethernet until later revisions of
code...  There are other factors that kick it out of CEF as well.. I
believe ACL's and Route Maps are 2 of them..

On Tue, 2003-09-09 at 11:07, Austad, Jay 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?

-jay
-- 
---------------------------
Jason H. Frisvold
Backbone Engineering Supervisor
Penteledata Engineering
friz () corp ptd net
RedHat Engineer - RHCE # 807302349405893
Cisco Certified - CCNA # CSCO10151622
MySQL Core Certified - ID# 205982910
---------------------------
"Imagination is more important than knowledge.
Knowledge is limited. Imagination encircles
the world."
      -- Albert Einstein [1879-1955]



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