Save CISCO switch configuration

You can use two commands to save your configuration, the write command or the copy command. The write command is deprecated, but would look like this

Router#write memory
Building configuration...
[OK]

The newer version of the command is the copy command, which looks like

Router#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]

source : http://www.dummies.com/how-to/content/cisco-networking-configuration-saving.html