Cisco 12010 series, Installation And Configuration Manual

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Chapter 1 Cisco 12010, Cisco 12410, and Cisco 12810 Series Router Overview
Line Card and Route Processor Overview
1-22
Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
OL-11496-01
GRP DRAM
The GRP uses Extended Data-Out (EDO) Dynamic Random Access Memory
(DRAM) to store routing tables, protocols, network accounting applications, and
to run Cisco IOS software.
Table 1-2 lists the DRAM configurations for the GRP.
Caution DRAM DIMMs must be 3.3-volt, 60-nanosecond devices only. Do not attempt to
install other devices in the DIMM sockets. To prevent memory problems, use the
Cisco approved memory products listed in
Table 1-2 .
GRP SRAM
Static Random Access Memory (SRAM) provides 512 KB of secondary CPU
cache memory. Its principal function is to act as a staging area for routing table
updates, and for information sent to and received from the line cards. SRAM is
not user-configurable and cannot be upgraded in the field.
GRP NVRAM
Nonvolatile Random Access Memory (NVRAM) provides 512 KB of memory for
system configuration files, software register settings, and environmental
monitoring logs. Built-in lithium batteries retain the contents of NVRAM for a
minimum of 5 years. NVRAM is
not user configurable and cannot be upgraded in
the field.
Table 1-2 GRP DRAM Configurations
Total DRAM Part Number DRAM Sockets Number of DIMMs
128 MB
1
1. Default shipping configuration.
MEM-GRP/LC-64(=) U39 (bank 1)
U42 (bank 2) Two 64 MB DIMMs
128 MB MEM-GRP/LC-128(=) U39 (bank 1) One 128 MB DIMM
256 MB MEM-GRP/LC-256(=) U39 (bank 1)
U42 (bank 2) Two 128 MB DIMMs