[c-nsp] DS-3 -> OC-3 upgrade

[David Freedman]

Just out of interest, is that 40% of CPU down to Interrupts,
or 40% of *TOTAL* CPU ?

If the latter, it may be that your box is being occupied by other tasks, 
such as a continual routing protocol reconvergence.

Dave.

Rick Ernst wrote:
> 
> I'm currently looking at upgrading our border routers from DS-3 to
> 100Mbs/Ethernet or OC-3.  The routers are 7206VXRs with NPE-300/256MB. They
> are each accepting full tables and are RR-clients for the core.
> 
> I've noticed with the DS-3s that CPU utilization is roughly 40% at 40Mbs of
> in/out traffic (80Mbs aggregate).  I've also seen that over 40% that
> latency increases through the router.  There is a small ACL (about 30
> entries), plus RPF checks on inbound traffic.
> 
> Based upon this empirical evidence, I'm hesitant to go OC-3, or even 100Mbs
> through them.  Do my numbers seem way off, or am I missing something?
> Would upgrading to NPE-400 "surely be enough", or should I look at other
> ways of bringing in higher-speed links?
> 
> Thanks,
> Rick
> 
> 
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