Cisco switches and fiber taps

From: Carl Johnson <Carl.Johnson(at)Overture.com>
Date: Tue Apr 01 2003 - 19:03:54 EST

Hi everyone,

I'm at a loss with how to get gigabit fiber data to my IDS. I've got a 6-station NetOptics gig fiber tap. It's outputting data fine, but when I connect the output from the tap to multimode SC GBICs on my 3550-12G Cisco switch, I can't see any of the data. The Cisco switch won't show the ports as "up", I guess because only the receive half of the fiber is connected as far as the switch is concerned - transmit side not connected.

What I'm trying to is described EXACTLY here:

http://www.sans.org/rr/intrusion/internal.php

Except that I have the 3550-12G switch instead of a 4912.

To have a SPAN session on the switch (to consolidate the data from the tap) the ports have to be up. Any idea how I can get the Cisco to recognize the incoming data?

Thanks very much!
Carl

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http://www.spidynamics.com/mktg/webappsecurity71 Received on Tue Apr 1 19:11:14 2003