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.
Table 1 | GRP Memory Components |
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| Quantity | Description | Location |
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DRAM |
| 641 to 512 MB2 | 1 or 2 | U39 (bank 1) | ||
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| configuration) for main Cisco IOS software functions (default | U42 (bank 2) |
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| configuration is 128 MB3) |
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SRAM4 |
| 512 | KB (fixed) | — | SRAM for secondary CPU cache memory functions | — |
NVRAM5 |
| 512 | KB (fixed) | 1 | NVRAM for system configuration files | — |
Flash memory | 8 MB SIMM6 | 1 | Contains Cisco IOS software images, system configuration | U17 | ||
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| files, and other |
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— |
| Flash memory7 | 1 to 2 | Contains Cisco IOS software images, system configuration | Flash disk | |
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| files, and other | slot 0 and |
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| cards or Flash disks8 | slot 1 |
Flash boot |
| 512 | KB | 1 | Flash EPROM for the ROM monitor program boot image | — |
ROM |
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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
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
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.
Note GRP route memory configurations of 512 MB are only compatible with Product Number
Memory Components
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