You are correct sir. What's interesting is that the CIT book doesn't
mention that detail. It just says "Optimum is the default" (I guess it is
talking about 7500's tho). When studying this, I went to Cisco's site and
read up on this to be sure...... It seems now (on units that support it)
CEF is the default as of IOS 12.0.
Here's the article I read.......... good info
http://www.cisco.com/warp/public/63/tuning.html
Mike W.
"John Neiberger" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Optimum switching is the default only on platforms that can use it.
> Lower-end routers like the 2500/2600/3600 can't do optimum. In those
> cases, fast switching is the default.
>
> >>> "Michael L. Williams" 6/25/01 5:12:13 PM >>>
> Mohamed,
>
> 1) Fast switching is the default for everything except IP. Optimum
> switching is the default for IP.]
>
> 2) Process switching is the most CPU intensive because the router has
> to
> processes every packet, no caching of anything. Some debug commands
> can
> actually overload a somewhat busy router and shouldn't be used if CPU
> utilization over 50%
>
> 3) All of these are just different switching methods, the details of
> which
> I cannot provide. However, I do know that Cisco Express Forwarding is
> not
> the same as any of these methods you mention. Check out:
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/switc
>
> h_c/xcprt2/xccef.htm
>
> (careful of wrap in the URL) for more info on CEF.
>
> Can't help on the white papers for Dist. Switching.....
>
> Mike W.
>
> "Mohamed El Komy" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > I'd like to know "which is the default switching in Cisco Routers
> for
> TCP/IP
> > traffic?" Is it Process or Fast Switching?"
> > Also there're some questions I need an answer to:
> >
> > 1- When issuning debug commands,do I need to turn off Fast Switching
> ?
> > 2- Which leads to more CPU and Memory utilization: Process or Fast
> Swithing?
> > 3- What's the differnece between Fast,Autonomous,Silicon and Optimum
> > Switching?
> >
> > I also need some technical papers about Distributed Switching using
> VIP
> > cards on Cisco 7500 series and its Architecture.
> >
> > Thanks,
> > komy
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