Cisco Systems manual Memory Components, Shows the memory components on the RSP8

Product Description

Memory Components

Table 1 shows the memory components on the RSP8.

Table 1	RSP8 Memory Components
Type		Size	Quantity	Description	Location
DRAM		64-MB1to	1 or 2	Any combination of 32-MB, 64-MB, or 128-MB DIMMs	U12 or
		256-MB DIMMs		(based on DRAM required) for main Cisco IOS image	U12 and U152
				functions
SRAM3		8 MB (fixed)	–	SRAM for packet buffering functions (MEMD)	–
		2 MB (fixed)	–	SRAM for tertiary (L3) CPU cache memory functions	–
NVRAM		2 MB	1	Nonvolatile SRAM for the system configuration file4	–
Flash memory		16-MB SIMM	1	Contains the Cisco IOS images on the RSP8	U1
		16-, 20-, or	Up to 2	Contains the Cisco IOS images on up to two Flash	Slot 0, or
		32-MB5Flash		memory cards	slot 0 and slot 1
		memory card
		48-, 64-, or	Up to 2	Contains the Cisco IOS images on up to two Flash Disks	Slot 0, or
		128-MB Flash			slot 0 and slot 1
		Disk6(option)
Flash boot ROM		16 MB	1	Flash EPROM for the ROM monitor program image	U7

1.64 MB of DRAM is the default DRAM configuration for the RSP8. The RSP8 is preconfigured with either two 32-MB DIMM or one 64-MB DIMM.

2.Do not mix memory sizes. If installing 2 DIMMs, both DIMMs must be the same size. If your router includes redundant RSPs, the RSPs should have the same memory size.

3.SRAM is not user-configurable or field-upgradable.

4.A system configuration file is contained in NVRAM, which allows the Cisco IOS software to control several system variables.

5.A 20-MB Flash memory card is the default shipping configuration for the RSP8 products.

6.The Flash Disk is offered as an option under the RSP8. You can use a Flash Disk side-by-side with a Flash memory card.

DRAM

DRAM stores routing tables, protocols, and network accounting applications and runs the Cisco IOS software. The standard (default) RSP8 configuration is 64 MB (preconfigured with either two 32-MB DIMMs or one 64-MB DIMM) of DRAM, with up to 256 MB available through DIMM upgrades.

DRAM is contained in up to two DIMM sockets: U12 (also called bank 0) and U15 (also called bank 1). When upgrading DRAM, you must use DIMMs from Cisco. (Also see the “Compatibility Requirements” section on page 13.)

Caution To prevent memory problems, DRAM DIMMS must be 3.3-volt (V) devices. Do not attempt to install higher-voltage devices in the RSP8 DIMM sockets.

SRAM

SRAM provides packet buffering and CPU cache memory functions. The standard RSP8 configuration is 8 MB of SRAM for packet buffering and 2 MB of tertiary (L3) CPU cache memory.

Route Switch Processor (RSP8) Installation and Configuration Guide

6 OL-4920-02