Hi,
My understanding is that routers perform basically two functions one is to route that
is to find the best path a given message should take and the other is to switch that
is once the route is known to send the data to the appropriate interface. I think
what they are saying in the book. If you know the path a message should take that is
the route then why go through the procedure of identifying it again why not just
switch it.
I know what I'm trying to say. What they say in the book is right "why burden the
CPU".
Teunis,
Hobart, Tasmania
Australia
On Monday, January 22, 2001 at 11:05:02 PM, [EMAIL PROTECTED] wrote:
> Hey Group,
> Me again. I'm reading for my CIT and am at the section where it goes
> into detail of the various switching methods in the router (i.e., silicon,
> CEF, autonomous, etc.) I understand how all this works and understand how the
> SP takes a lot of the stress away from the RP and this is good because your
> avoiding bogging the RP/CPU down. I have a problem with these statements
> though and want some clarification...
>
> Taken form the book (Lammle's CIT p. 173):
>
> "This is just another reason why switching is such a good practice. Why
> burden the RP with every packet if it's not necessary? By using switching
> methods, the RP is free to use valuable CPU time on more important things
> than doing route lookups for every packet that comes in the router."
>
> Correct me if I'm wrong but isn't that what a routers supposed to do??? What
> else does the RP have to do that is more important than ROUTING? I may be
> overanalyzing this but it just seems that he's saying that the RP has better
> things to do like make coffee, rather than route.
>
> Basically, could somebody give me a list of some other things the RP/CPU has
> to do other than route lookups...(I know there are access-lists and other CPU
> things here, I just would like a solid list to remember). Thanks team,
>
> Mark Zabludovsky ~ CCNA, CCDA, 3/4-NP
> <A HREF="mailto: [EMAIL PROTECTED]">[EMAIL PROTECTED]</A>
>
> "Even if I knew I had only 1 more week to live, I would still schedule
> my CCIE lab. I would just have to work a little harder I guess. After all,
> without any goals in life, I'm dead already."
> ~Mark Zabludovsky~
>
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