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1. Specifications

Hardware Features

Memory

Cisco 2800 series routers contain the following types of memory:

•

Table 3

RAM represent the minimum usable memory. You can install additional RAM in multiples of the default

amount, up to the maximum amount.

Table 3

Router

Platform

Cisco 2801

Cisco 2811

Cisco 2821

Cisco 2851

1. Cisco 2801 routers have 128 MB of SDRAM soldered onto the system board. You can install a DIMM into the expansion slot

2. Cisco 2811 routers can accept one 256 MB and one 512 MB DIMM to provide 768 MB of usable memory.

3. Cisco 2851 routers can accept two 512 MB DIMMs to provide 1024 MB of usable memory.

Overview of Cisco 2800 Series Routers

DRAM—Stores the running configuration and routing tables and is used for packet buffering by the

network interfaces. Cisco IOS software executes from DRAM memory.

Boot/NVRAM—Internal flash memory. Stores the bootstrap program (ROM monitor), the

configuration register, and the startup configuration.

Flash memory—External flash memory. Stores the operating system software image.

summarizes the memory options for Cisco 2800 series routers. The default memory numbers for

Router Memory Specifications

DRAM

Type—SDRAM DIMM

DIMM sizes—64 MB, 128 MB, 256 MB

DIMM expansion slots—1

Default onboard memory—128 MB

Maximum memory—384 MB

Type—ECC DDR (error-correcting code,

double data rate) SDRAM DIMM

DIMM sizes—256 MB, 512 MB

DIMM slots—2

Default onboard memory— none

Default memory—256 MB

Maximum memory—768 MB

Type—ECC DDR (error-correcting code,

double data rate) DRAM DIMM

DIMM sizes—256 MB, 512 MB

DIMM slots—2

Default onboard memory— none

Default memory—256 MB

Maximum memory—1024 MB

to increase memory to the maximum of 384 MB.

Boot/NVRAM

Internal 4-MB

flash memory

Internal 2-MB

flash memory

Flash Memory

External CompactFlash

memory cards of the

following optional

sizes:

64 MB (default)

•

128 MB