Overview of the Cisco 12008
•Up to 2 GB of SDRAM on two
•Two MB of SRAM for secondary CPU cache memory functions. SRAM is not user configurable or field replaceable.
•Two MB of NVRAM. NVRAM is not user configurable or field replaceable.
•Additional memory components used by the system, including onboard Flash memory and up to two Flash memory cards.
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The Cisco IOS software images that run the Cisco 12000 series Internet Router system are stored in Flash memory. Two types of Flash memory ship with the PRP:
1Onboard Flash memory — Ships as a single
2Flash disk— The PRP ships with a Flash disk that can be installed in either Flash disk slot. (See Figure
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 Internet 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 PRPs SDRAM.