Cisco 3600 Series Upgrade Instructions

2
Upgrading System Memory in Cisco 3700 Series Routers
OL-5423-02
Memory Capacities
This document contains the following sections:
• Memory Capacities, page 2
• Memory Configurations, page 3
• Safety Recommendations, page 4
• Tools and Equipment Needed, page 10
• Upgrading System Memory in Cisco 3725 Routers, page 10
• Upgrading System Memory in Cisco 3745 Routers, page 17
• Recovering Compact Flash Memory and System Images, page 27
• Obtaining Documentation, page 27
• Documentation Feedback, page 28
• Obtaining Technical Assistance, page 28
• Obtaining Additional Publications and Information, page 29
Memory Capacities
You might need to upgrade memory for the following reasons:
• To upgrade to a new Cisco IOS feature set or release that requires additional memory. (Memory
requirements for each feature set and release are available in the release notes for that release.)
• To use very large routing tables, many protocols (as may be required, for example, when the router
is part of both a large external network and your internal network), or other memory-intensive
features such as spoofing or protocol translations.
This document describes how to upgrade both dynamic memory and compact flash memory. Cisco 3700
series routers use dynamic memory in the form of SDRAM DIMMs (Cisco 3725 router) or SDRAM
SODIMMs (Cisco 3745 router). Memory capacities are shown in Table 1.
Note This document discusses how to replace dynamic memory only. To learn how to replace CompactFlash
memory cards, refer to Installing and Formatting Cisco 2691, Cisco 3631, and Cisco 3700 Series
CompactFlash Memory Cards, available online at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3700/hw_inst/hw_notes/
index.htm.
Table 1 Memory Capacities for Cisco 3700 Series Routers
Router DRAM Compact Flash Memory
Cisco 3725 256- (default) to 256-MB SDRAM DIMMs 32- (default) to 128-MB memory card
Cisco 3745 256- (default) to 512-MB SDRAM SODIMMs 32- (default) to 128-MB memory card

Cisco 3600 Series Specifications

General

Brand	Cisco
Model	3600 Series
Category	Network Router
Language	English