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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Product Description
Memory Components
Table 1 shows the memory components on the RSP8.
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 useDIMMs from Cisco. (Alsosee 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.
Table 1 RSP8 Memory Components
Type Size Quantity Description Location
DRAM 64-MB
1
to
256-MB DIMMs
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.
1 or 2 Any combinationof 32-MB, 64-MB,or 128-MB DIMMs
(based on DRAM required) for main Cisco IOS image
functions
U12 or
U12 and U15
2
2. Do not mixmemory sizes. If installing2 DIMMs, bothDIMMs must be thesame size. If yourrouter includes redundant RSPs,the RSPs shouldhave the
same memory size.
SRAM
3
3. SRAM is not user-configurable or field-upgradable.
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 file
4
4. A system configuration file is contained in NVRAM, which allows the Cisco IOS software to control several system variables.
–
Flash memory 16-MB SIMM 1 Contains the Cisco IOS images on the RSP8 U1
16-, 20-, or
32-MB
5
Flash
memory card
5. A 20-MB Flash memory card is the default shipping configuration for the RSP8 products.
Up to 2 Contains the Cisco IOS images on up to two Flash
memory cards
Slot 0, or
slot 0 and slot 1
48-, 64-, or
128-MB Flash
Disk
6
(option)
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.
Up to 2 Contains the Cisco IOS images on up to two Flash Disks Slot 0, or
slot 0 and slot 1
Flash boot ROM 16 MB 1 Flash EPROM for the ROM monitor program image U7