From: Kevin Baumgartner (kbaumgar@xxxxxxxxx)
Date: Tue Sep 19 2000 - 11:48:26 GMT-3
No that isn't exactly what I am saying. If you are running fast switching
on a interface and then for example apply a access-list that does tcp ports
filtering you are in effect turning off fast switching. This is because
the router has to look into each packet as it goes in or out of this
interface. So you can't fast switch the packet in this case.
Kevin
>
> Kevin,
> Are you saying that fast switching causes access-lists to be bypassed or
> were you getting at something different?
> Thanks,
> George
>
> At 06:44 PM 9/13/00 -0700, Kevin Baumgartner wrote:
> >
> >All this does is to allow enabling of fast switch
> >or by doing "no ip route-cache" to disable fast switch and
> >doing process switching.
> >
> > The issue is that some features will not allow fast switching.
> >For example access-lists. The router need to look into each packet
> >to see if there is match on the access-list. So in this case fast switching
> >can't be used.
> >
> >With fast switching it looks at the first packet and then
> >finds out what interface to send it to. Then all other packets who destinati
on
> >is the same address will be fast switched out to the same interface and
> >will no have to look in the packet at all. This is much faster than
> >process switching.
> >
> > Also a quick troubleshooting thing to try if
> >packets are not going out a interface is to turn
> >off fast switching. Especially if you are try some new
> >features and then don't work.
> >
> > Kevin
> >
> >At 08:05 PM 9/13/00 -0500, you wrote:
> >
> >>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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