Thank you for the july 9 response. Today, I updated cisco 3750-24 firmware to c3750-ipbasek9-mz.122-44.SE2 after configuring the ip and the vlan X. I then disconnected the switch and using the console port, changed the IP number,set the vlan to a different vlan X2. I then shut the old vlan X and removed from the configuration, by "no vlan X. I then took the switch and connected to the new vlan X2, but as soon has it came up, the switch controling the old vlan X was shutdown. That switch was then restarted and the "no shut" was issued on that vlan X. Is there a known bug that could be causing this?
Your help will be appreciated.