From: David Ankers (d.ankers@xxxxxxxxxxxxxx)
Date: Wed Sep 13 2000 - 23:33:34 GMT-3
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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