i would like to configure my switch in order to divide the network into 3 independante subnetworks ?
is it possible to do it by using the express setup?
if it is not, please indicate me an other solution.
Sounds like you want to setup VLans. Check this out: http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00800d84be.html