LOL.
You're right, it *is* an interesting way to phrase it.
>"... 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???
Actually, metaphysically speaking, I'd say, "No!"
The router's main job is to send the packet to the next hop in the best
path to the destination. So, "doing route lookups" is not his *job*,
but if that's what he has to do, then it happens as a by product. If he
can do his job without a route-table lookup, then so much the better,
freeing him up to handle other packets that do need a lookup, or
maintain the route table in a timely manner -- or make that new pot of
coffee.
Maybe,
"... the RP is free to use valuable CPU time on more important
things than doing route-table lookups for packets that don't
need a lookup; like doing lookups for packets that *do* need
a lookup :)
"
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=================================================
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Monday, January 22, 2001 11:05 PM
To: [EMAIL PROTECTED]
Subject: But isn't that the routers job???
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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