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1-10 Cisco 2500 Series Hardware Installation and Maintenance

Memory Configurations

Table 1-3 shows possible memory configurations for the router models.

Table 1-3 Memory Configurations

Memory Type Memory Capacity

Primary memory (DRAM SIMMs) 1 MB (expandable to 4, 8, or 16 MB)

Shared (packet) memory 1 MB (DRAM on the board)

1. The router has 2 MB of permanent (fixed) DRAM memory and a DRAM SIMM socket for upgrading

the memory. 1 MB of this permanent memory is used by the CPU and is called

primary memory. The

other 1 MB of memory is used by the network interface ports to store packets and is called

shared or

packet memory. When a DRAM SIMM is installed in the DRAM SIMM socket, all of the DRAM

memory on this SIMM becomes primary memory for the CPU, and the 2 MB of DRAM that is

permanent on the board becomes shared memory.

System-code memory (Flash or PROMs) 4 MB (expandable)

Boot ROM memory 2 MB (expandable)

Nonvolatile RAM (NVRAM) memory 32 KB

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