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Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0
Chapter 1 Cisco 7500 Series Product Overview
Route Switch Processor Overview
Caution
To prevent memory problems, DRAM DIMMS must be 3.3V devices. Do not attempt to install
higher-voltage devices (such as those designed for the RSP2) in the RSP4/4+ or RSP8 DIMM
sockets.
RSP SRAM
RSP static random-access memory (SRAM) provides packet buffering and CPU cache memory
functions.
Table 1-12
lists the RSP SRAM configurations.
RSP NVRAM
RSP nonvolatile random-access memory (NVRAM) stores the system configuration and the
environmental monitoring logs. It is backed up with built-in lithium batteries that retain the contents for
a minimum of 5 years.
Note
Before replacing an RSP, back up the running configuration to a Trivial File Transfer Protocol
(TFTP) file server so that you can later retrieve it. If the configuration is not saved, the entire
configuration will be lost—inside the NVRAM on the removed RSP—and you will have to reenter it
manually. This procedure is not necessary if you are temporarily removing an RSP you will reinstall;
lithium batteries retain the configuration in memory until you replace the RSP in the system.
RSP Flash Memory
Flash memory, either on a SIMM or on a Flash memory PC Card or Flash Disk, allows you to remotely
load and store multiple Cisco IOS software and microcode images and to back up configurations on your
Cisco 7500 series router.
You can download a new image over the network or from a local server and then add the new image to
Flash memory or replace the existing files. You can then boot the routers either manually or
automatically from any of the stored images. Flash memory also functions as a TFTP server to allow
other servers to remotely boot from stored images or to copy them into their own Flash memory.
Note
For specific Flash memory card procedures, see the
“Using the Flash Memory Cards in the RSPs”
section on page 4-20
.
Table 1-12
RSP SRAM Configurations
RSP
1
1.
RSP SRAM is not field-replaceable.
SRAM Description
RSP2
1 MB of SRAM for packet buffering, and 512 KB of secondary CPU cache SRAM
RSP4/4+
2 MB of SRAM for packet buffering, and 512 KB of secondary CPU cache SRAM
RSP8
8 MB of SRAM for packet buffering functions (MEMD)
