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Router Memory

This section describes the types of memory stored in the router and how to ﬁnd out how

much of each type of memory is stored in the router.

For instruction on how to upgrade memory in the router, refer to the "Installing and

Upgrading Router Memory" appendix later in this guide.

The Cisco 1700 router has the following types of memory:

•

Dynamic random-access memory (DRAM)—This is the main storage memory for the

router. DRAM is also called working storage and contains the dynamic conﬁguration

information. The Cisco 1700 router stores a working copy of Cisco IOS software,

dynamic conﬁguration information, and routing table information in DRAM.

•

Nonvolatile random-access memory (NVRAM)—This type of memory contains a

backup copy of your conﬁguration. If the power is lost or the router is turned off, this

backup copy enables the router to return to operation without reconﬁguration.

•

Flash memory—This special kind of erasable, programmable memory contains a copy

of the Cisco IOS software. The Flash memory structure can store multiple copies of the

Cisco IOS software. You can load a new level of the operating system in every router in

your network and then, when convenient, upgrade the whole network to the new level.

The Flash memory on the Cisco 1700 router is stored on mini-Flash modules.

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Cisco 1700 Router Hardware Installation Guide