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Product Description
Memory Components
Table 1
Table 1
RSP8 Memory Components
Type
Size
1
DRAM
64-MB
256-MB DIMMs
3
SRAM
8 MB (fixed)
2 MB (fixed)
NVRAM
2 MB
Flash memory
16-MB SIMM
16-, 20-, or
5
32-MB
memory card
48-, 64-, or
128-MB Flash
6
Disk
(option)
Flash boot ROM 16 MB
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
section on page
To prevent memory problems, DRAM DIMMS must be 3.3-volt (V) devices. Do not attempt to install
Caution
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
shows the memory components on the RSP8.
Quantity
Description
to
1 or 2
Any combination of 32-MB, 64-MB, or 128-MB DIMMs
(based on DRAM required) for main Cisco IOS image
functions
–
SRAM for packet buffering functions (MEMD)
–
SRAM for tertiary (L3) CPU cache memory functions
1
Nonvolatile SRAM for the system configuration file
1
Contains the Cisco IOS images on the RSP8
Up to 2
Contains the Cisco IOS images on up to two Flash
Flash
memory cards
Up to 2
Contains the Cisco IOS images on up to two Flash Disks Slot 0, or
1
Flash EPROM for the ROM monitor program image
13.)
Location
U12 or
U12 and U15
–
–
4
–
U1
Slot 0, or
slot 0 and slot 1
slot 0 and slot 1
U7
"Compatibility Requirements"
OL-4920-02
2
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