[c-nsp] Routing table

[Gert Doering]

Hi,

On Tue, Jul 26, 2005 at 11:28:21PM +0300, Jean-Christophe Varaillon wrote:
> >  are you aware of a problem occurring?
> 
> The CPU is flirting with the 35% at peack hours.
> 
> fa0/1                  fa0/2
> ---|----Router----|---Internet
> 
> Only, it would have be usefull if I could configure the router to say that
> traffic coming to fa0/2 has to use the FIB-1 and traffic coming to fa0/1 has
> to use the FIB-2.

If you have CEF switching enabled, the number of routes in the system
does not have any effect on the time needed to lookup a given destination.

Just abandon this train of thoughts.

"Too many routes" will slow down BGP convergence, and eat up gobs of
memory, but will *NOT* make the packet forwarding slower (if CEF is 
enabled - if not, do so).

> Any way, I will use the "ip flow-cache feature-accelerate" where the cache
> memory will be more efficiently used and I expect the CPU to decrease.

flow feature-acceleration is likely to be one of the most misunderstood
features.  Believe me.

It's likely to *increase* CPU usage for you, and it will start *using*
"cache memory" - CEF doesn't use any sort of "route cache" memory, so 
there's no need to do it efficiently.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de