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

[Steve Rowe]

Hi,

We're currently using a 3500XL switch for this purpose.  There are nine 
active data connections to the switch and we are port monitoring on three 
additional ports.  We average 150GB per day traffic through this switch 
(uni- and multi-cast) with the CPU averaging 48% usage, only varying 2-3% 
either way, and haven't had any issues.

Steve


At 10/18/01 - 08:27 AM, you wrote:

>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...
>
>Paul
>
> >>> 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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