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

[Daniel J McDonald]

Let's say you want to put 4 devices on this monitoring device.  Taps are a
couple of hundred bucks.  A switch is a thousand or so.  Would four taps in
serial be cheaper than a switch?

I personally don't see anything wrong with using a hub off the tapped port,
since you are only going to be able pull one direction from a tap, and the
Sniffer/IDS/RMON Probe/Content filter/Website approver shouldn't be making
any noise out of that interface anyway....

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Paul C. Williamson
Sent: Wednesday, October 17, 2001 8:15 AM
To: tdawson at bluemartini.com; Margaret.G.SHOLAAS at ris.lane.or.us
Cc: lsheldon at creighton.edu; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Any ethernet switch which always floods?



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.

-----Original Message-----
From: Travis Dawson [mailto:tdawson at bluemartini.com]
Sent: Tuesday, October 16, 2001 7:02 PM
To: Larry Sheldon; Margaret.G.SHOLAAS at ris.lane.or.us
Cc: lsheldon at creighton.edu; mrtg at list.ee.ethz.ch
Subject: Re: [mrtg] Re: Any ethernet switch which always floods?


At 03:12 PM 10/16/2001, Larry Sheldon wrote:
>I think the answer to my question is in here--but I'll need a bit of time
>to think this through.
Another possible answer, get a good switch (cisco or similar) and use portm
 irroring (or monitoring depending on manufacturer). Expensive but will dow
 hat you want it to do.

-tdawson
-Network Geek (Bit Pusher)
-BlueMartini Software


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