Cisco WS-X45-SUP6-E Hardware Maintenance Manual - Page 22

Memory Systems, Cisco Internetwork Operating System Cisco IOS software executes from main memory. - 4500

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Memory Systems Memory Systems The Cisco 4000 series memory systems (see Figure 1-2) have the following functions: • Main memory-Stores the running configuration and routing tables. The Cisco Internetwork Operating System (Cisco IOS) software executes from main memory. • Shared memory-Used for packet buffering by the router's network interfaces. • Nonvolatile memory-Stores the system configuration file and the virtual configuration register. • Flash memory-Stores the operating system software image. In the Cisco 4500-M, the Flash memory also stores the boot helper software. • EPROM-based memory-In the Cisco 4000-M, EPROM-based memory stores the boot helper-a subset of the Cisco IOS software-and the ROM monitor. In the Cisco 4500-M and Cisco 4700, only the ROM monitor is EPROM-based. The boot helper image allows you to boot the router when Flash memory does not contain a valid system image. In the Cisco 4500-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 boot helper prompt is as follows: router(boot)> The ROM monitor prompt for the Cisco 4000-M is the greater than sign: > The Cisco 4500-M and Cisco 4700 ROM monitor prompt is as follows: rommon 1 > (See the appendix "Cisco 4000 Series Virtual Configuration Register," the appendix "Cisco 4000-M ROM Monitor," and the appendix "Cisco 4500-M and Cisco 4700 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) Cisco IOS ROM monitor Cisco 4500, Cisco 4500-M, Cisco 4700, and Cisco 4700-M EPROM-based Flash-memory based ROM monitor Boot helper (xboot) Cisco IOS H3537 1-4 Cisco 4000 Series Hardware Installation and Maintenance

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1-4
Cisco 4000 Series Hardware Installation and Maintenance
Memory Systems
Memory Systems
The Cisco 4000 series memory systems (see Figure 1-2) have the following functions:
•
Main memory—Stores the running configuration and routing tables. The
Cisco Internetwork Operating System (Cisco IOS) software executes from main memory.
•
Shared memory—Used for packet buffering by the router’s network interfaces.
•
Nonvolatile memory—Stores the system configuration file and the virtual configuration register.
•
Flash memory—Stores the operating system software image. In the Cisco 4500-M, the Flash
memory also stores the boot helper software.
•
EPROM-based memory—In the Cisco 4000-M, EPROM-based memory stores the
boot
helper
—a subset of the Cisco IOS software—and the
ROM monitor
. In the Cisco 4500-M and
Cisco 4700, only the ROM monitor is EPROM-based. The boot helper image allows you to boot
the router when Flash memory does not contain a valid system image. In the Cisco 4500-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 boot helper prompt is as follows:
router(boot)>
The ROM monitor prompt for the Cisco 4000-M is the greater than sign:
>
The Cisco 4500-M and Cisco 4700 ROM monitor prompt is as follows:
rommon 1 >
(See the appendix “Cisco 4000 Series Virtual Configuration Register,” the appendix
“Cisco 4000-M ROM Monitor,” and the appendix “Cisco 4500-M and Cisco 4700
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