Cisco 4000 User Manual
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1-10 Cisco 4000 Series Installation Guide
Memory Systems
when Flash memory does not contain a valid system image. In the Cisco 4500-M and
4700-M, the ROM monitor allows you to boot a system image from Flash memory if a
boot helper image is not present in boot Flash memory.
The differences between the memory systems in the Cisco 4000 series allows enhanced
software upgradability in the Cisco 4500-M and Cisco 4700-M.
Note
See the appendixes “Cisco 4000 Series Virtual Configuration Register,”
“Cisco 4000-M ROM Monitor,” and “Cisco 4500-M and Cisco 4700-M ROM Monitor”
for more information on the ROM Monitor.
Figure 1-2
Cisco 4000 Series Memory Systems and Software Images
Cisco 4000 and Cisco 4000-M
EPROM-based
Flash-memory based
Boot helper
(xboot)
ROM monitor
Cisco IOS
Cisco 4500, Cisco 4500-M, Cisco 4700, and Cisco 4700-M
EPROM-based
Flash-memory based
ROM monitor
Boot helper
(xboot)
H3537
Cisco IOS