about mirroring port

["SB CH" <chulmin2 () hotmail com>]

hello, all.

I would like to setup ids(like snort) at mirroring port in cisco catalyst 
switch.
but all of the network traffic is over 100M, and my linux server which 
installs snort is not so good hardware.

So I think that when I setup snort at mirroring port, all traffic should 
via linux server so the network speed would be slow

Question.

1. when I setup the mirroring port,all traffic(for example, port2 traffic) 
would transfer like this or just copy the traffic mirroring port too?

(1) client --> mirroring port1 --> port 2  
(2) client --> port 2
           --> mirroring port (copy too)

2. Is there any problem when I set snort at mirroring port if the traffic 
is so high(over 100~200M)?

3. do you know any commands to setup mirroring port at catalyst 400x(catos 
based) switch?


Thanks in advance.


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