Why route and switch if you've already figured out the path and only need to
switch? It only adds delay, even if the RP is just sitting there idle (if
nothing else means it'll be even more ready to route when it needs to, but
that's not really the point).
--
Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
<[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi Tony,
> I understand all of this fully but where I'm confused is, how much of
a
> burden could this be if that's all it has to do. I want to know what the
> "more important" things are...Maybe I overestimate the power of a route
> processor but I would think that its especially created with the power to
> handle tons of routing considering that that's what its designed for...am
I
> wrong?
>
> Mark Z.....
>
> In a message dated 1/22/01 11:27:41 PM Eastern Standard Time,
> [EMAIL PROTECTED] writes:
>
>
> > 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~
> >
>
>
> 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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