I have an existing 3725 router with default 32M Flash. I want to upgrade it to 64M. Should I order an internal memory MEM3725-64CF= or should I order the external MEM3725-64CF-EXT memory to perform the upgrade? Which is better?
If I install the 64M external. Does that mean the internal existing 32M will be not in use then? So I will put the new IOS on the external card and the router will ignore the old 32M internal memory and the old IOS in it?