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Check out the NSA references at this address:http://www.nsa.gov/snac/index.cfm?MenuID=scg10.3.1If the link doesn't work just go to the NSA site and click on the Information Assurance link. They have a lot of information on hardening IT systems.
In order to have more than 1 vlan active at a time you must have a VTP Trunk line. Make sure your connection to the other switches is set for trunking.
