Cisco Systems GRP-B manual Memory Components, Type, Quantity Description Location

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
Type		Size		Quantity	Description	Location
DRAM		641 to 512 MB2		1 or 2	64-, 128-, or 256-MB DIMMs (based on the required DRAM	U39 (bank 1)
					configuration) for main Cisco IOS software functions (default	U42 (bank 2)
					configuration is 128 MB3)
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
					files, and other user-defined files on the GRP
—		Flash memory7		1 to 2	Contains Cisco IOS software images, system configuration	Flash disk
					files, and other user-defined files on up to two Flash memory	slot 0 and
					cards or Flash disks8	slot 1
Flash boot		512	KB	1	Flash EPROM for the ROM monitor program boot image	—
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.

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.

Memory Components

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