Memory
Memory
This section describes the various types of memory that may be present in a Cisco 3600 series router.
Memory Types
Cisco 3600 series routers support the following types of memory:
•
•
•
•
Memory Installation Documentation
For information about installing DRAM, SDRAM, NVRAM, and Flash memory SIMMs, refer to the
following hardware configuration note:
•
For information about installing Flash memory PCMCIA cards, refer to the following hardware
configuration note:
•
For information about installing compact Flash memory cards, refer to the following hardware
configuration note:
•
Memory Specifications
Table 1-1
Table 1-1
Description
Processor
DRAM (main plus shared)
NVRAM
Flash memory (SIMM)
Flash memory (PCMCIA)
Boot ROM
1. IDT = Integrated Device Technology.
Cisco 3600 Series Routers Hardware Installation Guide
1-6
DRAM or SDRAM—Stores the running configuration and routing tables, and is used for packet
buffering by the router's network interfaces. The Cisco IOS software executes from DRAM.
Nonvolatile random-access memory (NVRAM)—Stores the system configuration file and the virtual
configuration register. (For more information, see
Flash memory—Stores the operating system software image. You can also add Flash memory on
PCMCIA cards and compact Flash cards, depending on the router.
EPROM-based memory—Stores the ROM monitor, which allows you to boot an operating system
software image from Flash memory or PCMCIA memory.
Upgrading System Memory in Cisco 3600 Series Routers
Installing and Configuring Flash Memory Cards in Cisco 3600 Series Routers
Installing and Formatting Cisco 2691, Cisco 3631 and Cisco 3700 Compact Flash Memory Cards
through
Table 1-4
list processor and memory specifications for the routers.
Cisco 3620 Router Processor and Memory Specifications
Appendix C, "Configuration
Specification
1
80-MHz IDT
R4700 RISC
4 to 64 MB
32 KB
4 to 32 MB
2 to 40 MB
512 KB
Chapter 1
Overview of Cisco 3600 Series Routers
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