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Memory Configurations

For information on configuring dynamic memory and compact flash memory, see the following sections.

Dynamic Memory

You can configure dynamic memory (SDRAM) as a mixture of primary or main memory that is reserved

for the CPU and shared memory that is used for data transmitted or received by modules and WAN

interface cards.

To examine current dynamic memory status or reconfigure memory allocation, do the following, as

appropriate:

To see how much memory is currently installed in your router, enter the show version command in

Step 1

EXEC mode. Near the middle of the resulting output, locate a message similar to the following:

Cisco XXXX processor (revision X) with 24576K/8192K bytes of memory.

This line shows how much memory is installed (in this example, 24576K/8192K). The first number

represents primary memory; the second number represents shared memory.

To configure the proportion of SDRAM devoted to main memory and to shared memory, enter the

Step 2

memory-size iomem command in global configuration mode.

For information about these and related commands, refer to the Cisco IOS configuration guides and

Note

command references. See the

these publications.

Dynamic memory resides in one or two sockets in the router chassis. A socket corresponds to one bank

of memory. Cisco 3700 series router sockets are as follows:

•

SDRAM DIMM and SODIMM sizes allowed in each router type, and the total memory capacity

resulting from insertion of one or two DIMMs or SODIMMs, are shown in

OL-5423-02

"Obtaining Documentation" section on page 27

Cisco 3725: Two sockets, each of which can support one SDRAM DIMM or be left empty; sockets

can be filled in any order

Cisco 3745: One socket that can support two SDRAM SODIMMs, one on top of the other

Upgrading System Memory in Cisco 3700 Series Routers

Memory Configurations

for information about

Table