Chapter 1 Product Overview
Route Processors
1-8
Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
GRP memory components are presented in the following sections.
•
EDO DRAM—Extended Data Output, Dynamic Random Access Memory
•
DIMM—Dual Inline Memory Module
•
SRAM—Static Random Access Memory
•
NVRAM—Non-Volatile Random Access Memory
•
Flash Memory:
–
SIMM—Single In-line Memory Module
–
ROM—Read Only Memory
–
PCMCIA—Personal Computer Memory Card International Association
cards or Flash memory cards.
The Cisco 12404 router supports system software downloads for most Cisco IOS
software upgrades, which enables you to remotely download, store, and boot from
a new Cisco IOS image.
EDO DRAM
The EDO DRAM on the GRP stores routing tables, protocols, and network
accounting applications. It also runs the Cisco IOS software. The default GRP
DRAM configuration is 64 megabytes (MB) of EDO DRAM, which you can
increase up to 256 MB maximum, through DRAM upgrades. Cisco IOS software
runs from within GRP DRAM.
DIMM
The Dual In-line Memory Module (DIMM) with 168 pins, is a small circuit board
that holds memory chips and doubles the number of circuit paths to and from a
module by using independent pins on each side of the edge connector. You can
install DIMM memory modules one at a time.
SRAM
The principle function of SRAM is to act as a staging area for routing table update
information to and from the line cards. SRAM also provides secondary CPU
cache memory. The standard GRP configuration is 512 KB. SRAM cannot be
upgraded or configured.
todd.book Page 8 Tuesday, November 27, 2007 6:02 PM
