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Memory Components
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Product Overview
Memory Components
Figure 2 shows the locations of the various types of memory used on the GRP. GRP memory component
types are presented in the following sections:
• DRAM
• SRAM
• NVRAM
• Flash Memory
Their functions are presented in Table 1.
DRAM
DRAM stores routing tables, protocols, and network accounting applications, and runs the Cisco IOS
software. The standard (default) GRP configuration is 128 MB of extended data output (EDO) DRAM,
with up to 512 MB available through DIMM upgrades.
Note GRP route memory configurations of 512 MB are only compatible with Product Number GRP-B=.
In addition, Cisco IOS Release 12.0(19)S or 12.0(19)ST or later and ROMMON Release 11.2 (181)
or later are also required.
Table 1 GRP Memory Components
Type Size Quantity Description Location
DRAM 64
1
to 512 MB
2
1. 64 MB of DRAM serves as a replacement for any DRAM DIMM slot on a minimum configuration of 128 MB (both slots populated) for the GRP.
2. GRP route memory configurations of 512 MB are only compatible with Product Number GRP-B=. Cisco IOS Release 12.0(19)S or 12.0(19)ST or later
and ROMMON Release 11.2 (181) or later are also required.
1 or 2 64-, 128-, or 256-MB DIMMs (based on the required DRAM
configuration) for main Cisco IOS software functions (default
configuration is 128 MB
3
)
3. Default DRAM configuration is 128 MB. Bank 1 (U39) must be populated first. You can use one or both banks to configure DRAM up to 512 MB.
U39 (bank 1)
U42 (bank 2)
SRAM
4
4. SRAM is not user configurable or field upgradeable.
512 KB (fixed) — SRAM for secondary CPU cache memory functions —
NVRAM
5
5. NVRAM is not user configurable or field upgradeable.
512 KB (fixed) 1 NVRAM for system configuration files —
Flash memory 8 MB SIMM
6
6. SIMM socket is wired for Cisco’s own design and does not accept industry-standard 80-pin Flash SIMMs.
1 Contains Cisco IOS software images, system configuration
files, and other user-defined files on the GRP
U17
— Flash memory
7
7. Cisco IOS Release 12.0(17)S or 12.0(17)ST or later is required, along with the corresponding boot images, for the GRP to function with a Flash disk.
1 to 2 Contains Cisco IOS software images, system configuration
files, and other user-defined files on up to two Flash memory
cards or Flash disks
8
8. Linear Flash memory cards and ATA Flash disks can be used in either (or both) Flash card slot(s).
Flash disk
slot 0 and
slot 1
Flash boot
ROM
512 KB 1 Flash EPROM for the ROM monitor program boot image —