[mrtg] Re: Any ethernet switch which always floods?

SHOLAAS Margaret G Margaret.G.SHOLAAS at ris.lane.or.us
Thu Oct 18 17:27:18 MEST 2001

Right now we're in a test situation without all the taps in place that we
ultimately want to use, so CPU is pretty low. I can't see the real-world
effect of SPANing (or not) to multiple ports with lots of data pouring into
the switch. Cisco TAC has told me that SPAN eats up cycles, and at some
point I could lose packets because the switch would be overwhelmed. I'm
trying to make the setup as economical as possible to minimize the chance of
that happening, but it's possible what we actually need won't tax the box
beyond its capabilities. 

-----Original Message-----
From: Paul C. Williamson [mailto:pwilliamson at mandtbank.com]

Do you know what the CPU is doing?  You could monitor 
the effect of the Span on the cpu if you can get a good 
baseline without it...


>>> SHOLAAS Margaret G <Margaret.G.SHOLAAS at ris.lane.or.us> 10/16/01 11:04PM

I am using a Cisco switch. I'm trying to avoid mirroring (SPAN), since it's
more CPU intensive than flooding, but I may not be able to. Thanks for the
suggestion, though.

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