From: Michel Bijnsdorp (michel.bijnsdorp@xxxxxxx)
Date: Fri Sep 15 2000 - 06:10:03 GMT-3
Here is some nice overview:
http://www.cisco.com/warp/public/63/tuning.html
David Ankers wrote:
> ip route-cacheJamie,
>
> You're question is not as basic as you might think. Different switching
> methods are also highly platform and ISO specific, it also a cause of great
> confusion.
>
> There is one very good reason for turning off fast switching i.e. no ip
> route-cache, this is load balancing. If a router has 2 (or more) equal cost
> routes to a destination and is configured for load balancing it will load
> balance per destination when fast switching is enabled i.e. first ftp from
> host a to b take path one, second ftp to b takes path two. If fast switching
> is disabled load balencing is done per packet.
>
> As for autonomous switching (ip route-cache cbus) it allows the ciscoBus to
> switch packets independently without interrupting the system processor.
> Basically an early CEF but there are a few cases where it can't be used for
> example when extended access-list or accounting is turned on.
>
> As for the vlan ints, I'm *guessing* that you are using an RSM, in which
> case this is just a 7500 router anyway and runs basically the same software.
>
> Dave.
>
> ----- Original Message -----
> From: Price, Jamie
> To: ccielab@groupstudy.com
> Sent: Thursday, September 14, 2000 3:05 AM
> Subject: ip route-cache
>
> Hi,
> Can anyone help me out here?
> I've been wondering about the aforementioned command. I realize, after
> looking at the docs that "ip route-cache" enables fast switch processing but
> I'm curious about the parameters and the ability to disable it.
> Can anyone provide me with some solid, factual, reasons as to why you would
> want to turn fast switching off or turn autonomous switching on, etc? Also
> why can you use it on a Vlan interface in a switch - this one sort of has me
> at the moment?
> If this is something basic that I'm overlooking.......well....I was going to
> apologize but we all have to take a trip back to the basics sometime dont
> we.....so I wont :)
> Thanks
> Jamie
>
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