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Memory Systems

Note

and wiring practices and have experience as an electronic or electromechanical technician.

When you upgrade Flash memory, a Trivial File Transfer Protocol (TFTP) ﬁle server must be

available that has the desired Cisco Internetwork Operating System (Cisco IOS) software

image—Release 10.2(6) or later. These Cisco IOS ﬁles can then be downloaded into the upgraded

Flash memory using TFTP. Consult your network administrator about the availability of TFTP ﬁle

servers and Cisco IOS software on your network. The router will not be fully functional without the

system software and running conﬁguration. Consult the appropriate Cisco IOS software publication,

which is available on the Cisco Connection Documentation Enterprise Series CD or as a printed

document, for TFTP procedures.

Note

Figure 1 shows the front view of a Cisco 4000 series router.

Figure 1

Memory Systems

The Cisco 4500, Cisco 4500-M, Cisco 4700, and Cisco 4700-M memory systems (see Figure 2)

have the following functions:

•

2 Upgrading Cisco 4500, Cisco 4500-M, Cisco 4700, and Cisco 4700-M Memory

This publication is for the router installer, who should be familiar with electronic circuitry

One upgraded router can serve as a TFTP server to upgrade other routers.

Front View of a Cisco 4000 Series Router

Network activity LEDs

DATA

Health LEDs

Main memory—Stores the running conﬁguration and routing tables. The Cisco IOS software

executes from main memory.

Shared memory—Used for packet buffering by the router's network interfaces.

NVRAM—Stores the system conﬁguration ﬁle and the virtual conﬁguration register.

Flash memory—Stores the operating system software image and the boot helper software. The

boot helper image allows you to boot the router when Flash memory does not contain a valid

system image.

DATA

Run LED

SERIES

POWER

Power LED