Memory; Power Supply - Cisco 4451 ISR Hardware Installation Manual

Hardware Features of Cisco 4000 Series ISRs

Memory

The routers contain the following types of memory:
•
Note
•
•
•
•

Power Supply

The routers support a variety of power supply configurations. The power supplies module are
field-replaceable and externally accessible. Cisco 4331 ISR power supply module is not externally
accessible, it is inside the chassis.
Cisco 4451-X ISR and Cisco 4431ISRs support dual, hot-swappable power supplies. The PoE Power
Supply Converter on Cisco 4451-X ISR is also dual and hot-swappable.
Table 1-5
Table 1-5 Field Replaceable Unit Power Options
Router Model AC Input PSU
Cisco 4451 ISR
Cisco 4431 ISR
Cisco 4351 ISR
Cisco 4331 ISR
Cisco 4321 ISR
Cisco 4221 ISR
Hardware Installation Guide for the Cisco 4000 Series Integrated Services Router
1-36
DIMMs—Stores the running configuration and routing tables and is used for packet buffering by the
network interfaces. Cisco IOS XE software executes from memory. Supported module types are
Dual In-Line Memory Modules (DIMMs).
The DIMMs are interchangeable although the same sizes are not supported in all locations. The
Cisco 4300 ISRs use a different type of DIMM compared to the 4400 ISRs. For proper operation,
the DIMMs for the Cisoc 4400 ISR should not be installed in an Cisco 4300 ISR and vice a versa.
The single forwarding plane DIMM must have a 2-GB DIMM that is exactly like one of the two
DIMMs used for the control plane with 4 GB of default memory. The control plane uses two
DIMMs and they must be exactly the same type and density. This applies only to Cisco 4400
Series ISRs. Cisco 4300 Series ISRs do not have a distinct forwarding plane DIMM.
Boot/NVRAM—Stores the bootstrap program (ROM monitor), and the configuration register. The
boot/NVRAM is not serviceable.
Flash memory—Internal bootflash memory. For details, see
page 1-35.
CompactFlash memory card (Cisco 4451-X ISR routers)—Available in 8 GB, 16 GB, or 32 GB.
eUSB flash card (Cisco 4300 ISR router)—Available in 8 GB or 16 GB.
summarizes the power options.
DC Input PSU
Y
Y
Y
Y
Y
Y
Dual, Hot Swap Power
Supply
—
Y
—
Y
—
Y
Chapter 1 Overview of Cisco 4000 Series ISRs
the"System Flash" section on
PoE Power Supply
Converter
Y
Y
—
—
—
—
Y
—
Y
—
—
—
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