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Router Memory

Cisco 1400 Series Router Installation and Configuration Guide

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Router Memory

This section describes the types of memory used by the router and how to ﬁnd out how

much of each type the router is using.

Memory Types

The Cisco 1400 series routers have the following types of memory:

• Dynamic RAM (DRAM)—This is the main storage memory for the router. DRAM is

also called working storage and contains the dynamic conﬁguration information. The

Cisco 1400 series router operates from DRAM.

• Nonvolatile RAM (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 ROM 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 1400 series router is stored on a Flash PC card.

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