Installation guide

2
Upgrading System Memory in Cisco 3600 Series Routers
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Memory Capacities
• Memory Configurations, page 3
• Safety Recommendations, page 9
• Tools and Equipment Needed, page 14
• Opening the Router, page 14
• Replacing DRAM and SDRAM, page 18
• Replacing Cisco Flash Memory SIMMs, page 25
• Replacing ROM, page 29
• Closing the Router, page 33
• Replacing Connections to the Router, page 36
• Testing ROM Installation, page 37
• Recovering Cisco Flash Memory and System Images, page 37
• Obtaining Documentation, page 38
• Obtaining Technical Assistance, page 39
Memory Capacities
This document describes how to upgrade both dynamic memory and Cisco Flash memory. 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.
Cisco 3600 series routers use two types of dynamic memory:
• DRAM SIMMs (Cisco 3620 and Cisco 3640 routers)
• SDRAM DIMMs (Cisco 3631 and Cisco 3660 routers)
Note SIMMs and DIMMs are not interchangeable.
Memory capacities are shown in Table 1.
Table 1 Memory Capacities for Cisco 3600 Series Routers
Router DRAM Cisco Flash Memory
Cisco 3620 32- to 64-MB DRAM SIMMs 8- to 32-MB SIMM
Cisco 3631 64- to 256-MB SDRAM DIMMs 32- to 128-MB Flash memory card
Cisco 3640 32- to 128-MB DRAM SIMMs 8- to 32-MB SIMM
Cisco 3660 32- to 256-MB SDRAM DIMMs 8- to 64-MB SIMM