I need to replace 3750 stack switches with 4500 x switch i just need to take the backup of 3750 switch and paste paste it in 4500 x switch ? or do i need some modification ?
As other responses have pointed out it is not feasible to just directly copy the config from 3750 to 4500. You will need to make some modifications to the config file before inputting it to the 4500 (removing references to stacking, modifying interface naming/numbering, perhaps modifying qos configuration, modifying to account for syntax differences of the new OS, etc). To do that you will need to obtain a copy of the existing config, edit that copy to incorporate the changes, and insert the new config to the new switch. Options for obtaining a copy of the existing config include doing a show run and copy/paste the config into a text file, or using tftp/ftp to copy the running config to a server and making a copy of the config from the server. Options for inserting the new config to the 4500 include doing a copy/paste of the config text file to the 4500, placing the new config in the appropriate directory of the server and using tftp/ftp to copy the new config to the 4500.