Configuration will migrate automatically.  It would be prudent to save your configuration before though.  Read configuration migration doc included in release zip file.
Hi, We have a few PowerConnect M6220 and M8024 running firmware version 3.x. We have noticed that the new firmware version 4.x has some configuration changes, e.g. interface names are different. If we upgrade our switches to the new firmware version, will the configuration be automatically updated to work with the new firmware version or do we have to change it manually after the firmware upgrade? Thanks.
M6220/M8024 firmware upgrade from version 3.x to 4.x and configuration migration