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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Upgrading the Cisco IOS Software
How to Upgrade the Cisco IOS Image
Examples
The following examples show how to copy a startup configuration to a TFTP server and how to copy
from flash memory to an FTP server.
Copying the Startup Configuration to a TFTP Server: Example
The following example shows the startup configuration being copied to a TFTP server:
Router# copy nvram:startup-config tftp:
Remote host[]? 192.0.0.1
Name of configuration file to write [rtr2-confg]? rtr2-config-b4upgrade
Write file rtr2-confg-b4upgrade on host 192.0.0.1?[confirm] <cr>
![OK]
Copying from Flash Memory to a TFTP Server: Example
The following example uses the dir flash0: command in privileged EXEC mode to learn the name of the
system image file and the copy flash0: tftp: command in privileged EXEC mode to copy the system
image to a TFTP server. The router uses the default username and password.
Router# copy flash0: tftp:
Source filename [running-config]?
Address or name of remote host []? 192.0.0.1
Destination filename [router-confg]? running-config
983 bytes copied in 0.048 secs (20479 bytes/sec)
Router#
Router# dir flash0:
Directory of flash0:/
1 -rw- 48311224 Mar 2 1901 11:32:50 +00:00
c3900-universalk9-mz.SSA.XFR_20090407
2 -rw- 185667 Jan 27 2021 09:03:54 +00:00 crashinfo_20210127-090354
3 -rw- 983 Feb 14 2021 12:41:52 +00:00 running-config
260173824 bytes total (211668992 bytes free)
Router#
Ensuring Adequate DRAM for the New System Image
This section describes how to check whether your router has enough DRAM for upgrading to the new
system image.
Prerequisites
Choose the Cisco IOS release and system image to which you want to upgrade. See the “Information
About Upgrading the System Image” section on page 218.
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