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Chapter 1 Product Overview
Route Processors
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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
The Cisco IOS software images are stored in Flash memory. Two types of Flash
memory ship with the PRP:
1. Onboard Flash memory—Ships as a single in-line memory module (SIMM).
This Flash memory contains the Cisco IOS boot image (bootflash) and is not
field replaceable.
2. Flash disk—The PRP ships with a Flash disk that can be installed in either
Flash disk slot. (See Figure 1-9.) The Flash disk contains the Cisco IOS
software image.
Storing the Cisco IOS images in Flash memory enables you to download and boot
from upgraded Cisco IOS software images remotely, or from software images that
reside in PRP Flash memory.
Cisco 12000 Series Routers support downloadable system software for most
Cisco IOS software upgrades. This enables you to remotely download, store, and
boot from a new Cisco IOS software image. The Cisco IOS software runs from
within the SDRAM of the PRP.
Figure 1-9 shows the locations of the various hardware components on the PRP.