Sniffing packets from switch 2900

[zillah2004]

I have got Cisco switch 2900, which it have got 24 PCs (24 ports) connected to this switch.

I want to do a test , how can I sniff all packets (not only intended for me) on my LAN (for all 24 PCs) ?

[nhabib]

Only way to do this is if all PCs are on the same VLAN

If that is the case, then you can span the vlan to a port and plug your sniffer in that port.

[zillah2004]

((then you can span the vlan to a port and plug your sniffer in that port.))

Could you please ,explain what is the concept behind that?

[attrgautam]

This should explain SPAN /Port mirroring

http://www.cisco.com/en/US/products/hw/switches/ps5213/products_configuration_guide_chapter09186a00801ce027.html. The Sniffer can be ethereal software.

HTH