can someone explain to me how dynamic vlans function on a stack of 3750s? i currently have dell equipment and the vlan assignments time out after 5 minutes and default to native setting. supposedly, the switch will see activity when a computer is in use again and re-assign the vlan. this is very inconsistent!! i set this up in one building and 40% of the desktops had connection issues. i'm curious if the 3750s function differently as far as the time out and if i can tell the switch confirm what is plugged into its ports so they don't lose their vlan assignment. thanks!!