span and stacking switch and MSFC

[Chiara Sambi <Sambi () ictc it>]

I have 2 switch Cisco 3548 in stack and i need to analyze the traffic that
they sent to and receive from a management VLAN of an IDC that is I need  to
monitor a port as SPAN port, to put an IDS sensor. I wonder if i can put
only one SPAN port to analyze ALL the traffic passing through the 2 switches
or i need 2 SPAN ports, one for each switch. And what about RSPAN? 

And moreover I have read that on the switch Catalyst 6000 it is possible to
use port 15/1 (or 16/1) as a SPAN source that will allow it to monitor
traffic forwarded to the Multilayer Switch Feature Card (MSFC). So I'd like
to know if i can use this port as source SPAN port for 2 different SPAN
sessions, one for traffic TO the MSFC and one for the traffic FROM the MSFC,
with 2 different SPAN destination ports. Is this a promiscuos port? 

All what u can tell me will be appreciated


-----------------------------------
Dott.sa Chiara Sambi
Consultant

ICT consulting
20140 Milano
via Vittor Pisani 22
tel: +39 02 67642249
fax: +39 02 67642243
e-mail: sambi () ictc it