The other major thing the CPU has to do besides switch (route) packets to
their output interface is learn the network topology. It learns the network
topology and the best path to remote networks by participating in routing
protocols.
Some other things that the CPU does (depending on the configuration) is
access lists, fancy queuing, SAP, ZIP, NAT, handle input at the console,
SNMP, CDP, HSRP, IGMP, PIM, STUN, proxy stuff, and a zillion other TLAs and
FLAs. &:-)
Priscilla
At 11:05 PM 1/22/01, you 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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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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