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Product Overview
Memory Components
Figure 2
types are presented in the following sections:
•
•
•
•
Their functions are presented in
Table 1
GRP Memory Components
Type
Size
1
DRAM
64
to 512 MB
4
SRAM
512 KB (fixed)
5
NVRAM
512 KB (fixed)
Flash memory 8 MB SIMM
—
Flash memory
Flash boot
512 KB
ROM
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.
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.
4. SRAM is not user configurable or field upgradeable.
5. NVRAM is not user configurable or field upgradeable.
6. SIMM socket is wired for Cisco's own design and does not accept industry-standard 80-pin Flash SIMMs.
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.
8. Linear Flash memory cards and ATA Flash disks can be used in either (or both) Flash card slot(s).
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.
GRP route memory configurations of 512 MB are only compatible with Product Number GRP-B=.
Note
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.
Memory Components
6
shows the locations of the various types of memory used on the GRP. GRP memory component
DRAM
SRAM
NVRAM
Flash Memory
Quantity
Description
2
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
—
SRAM for secondary CPU cache memory functions
1
NVRAM for system configuration files
6
1
Contains Cisco IOS software images, system configuration
files, and other user-defined files on the GRP
7
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
1
Flash EPROM for the ROM monitor program boot image
Table
1.
3
)
8
Location
U39 (bank 1)
U42 (bank 2)
—
—
U17
Flash disk
slot 0 and
slot 1
—
78-4339-09
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