Installation guide

Upgrading System Memory in Cisco 3600 Series Routers

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Memory Configurations

Step 1 To see how much Cisco Flash memory is currently installed in your router, enter the show flash

command in EXEC mode.

You can upgrade Cisco Flash memory by doing either or both of the following:

• Cisco 3631: Replace the existing card with one of greater capacity.

Note For instructions on how to install a Cisco Flash memory card, refer to documentation on

installing and configuring or formatting Cisco Flash memory, available online at

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/hw_no

tes/index.htm

• Cisco 3620, Cisco 3640, and Cisco 3660: Do either or both of the following:

–

Replace the existing (typically 4-MB) SIMM with one of greater capacity.

–

Add a SIMM to the second Cisco Flash memory socket.

Each Cisco Flash memory SIMM socket corresponds to one bank of memory. Fill starting with bank 0,

and empty starting with bank 1. Bank 0 must always be filled first and emptied last.

Specifics for the Cisco 3620, Cisco 3640, and Cisco 3660 routers are listed in the following table and

discussed below.

Note Cisco Flash memory SIMMs are not interchangeable with DRAM SIMMs or SDRAM DIMMs.

Table 7 lists possible Cisco Flash memory SIMM configurations and the resulting total Cisco Flash

memory.

Upgrade Strategy Cisco 3620, Cisco 3640 Cisco 3660

Step 1

Replace existing SIMM with... 8- or 16-MB SIMM 8-, 16-, or 32-MB SIMM

Step 2

Add a SIMM to the second Cisco Flash

memory socket

To a total of... 32 MB 64 MB