I have never really understood this so I wanted to publish the question this morning.
Which memory on a router/switch does the "logging buffered". I would guess that it is the main memory displayed in the line:
Cisco 3845 (revision 1.0) with 484351K/39936K bytes of memory.
Is this correct?
Typically, logging messages are stored in a router's memory buffer; when the buffer is full, older messages are overwritten by new messages.
Hope that helps.