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This process is also true if you want to restore your configuration from NVRAM to RAM with this command (the third restore option):
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IOS# copy startup-config running-config
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If your backed-up configuration is in flash, use this syntax to restore it:
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IOS# copy flash:file_name running-config|startup-config
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The copy command backs up and restores con guration les: copy running-con g startup-con g and copy running-con g tftp back up the con guration leThe copy startup-con g running-con g
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and copy tftp running-con g or copy tftp startup-con g commands restore the con guration leThe erase startup-con g command deletes the con guration le
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Creating and Deleting Con guration Files
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Along with knowing how to back up and restore configuration files, you also need to know how to create and delete them Actually, you already know how to create a basic configuration file by going into Configuration mode with the Privilege EXEC configure terminal command When you are executing commands within this mode (whether by typing them or pasting them in), the IOS is using a merge process (unless you use the no parameter for a command to delete or negate it)
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1703The CD contains a multimedia demonstration of deleting the NVRAM configuration file of a router You can also delete your configuration file in the startup-config file in NVRAM by using the following command:
IOS# erase startup-config|nvram
The 111 and earlier versions of this process, which are still supported, use the write erase command To verify the erasure, use the show startup-config command:
IOS# show startup-config %% Non-volatile configuration memory is not present
17: IOS Device Management
Con guration File Nomenclature
Starting with IOS 120 and later, Cisco introduced command and naming nomenclatures that follow IOS File System (IFS) guidelines (what you are used to when you are entering a URL in a web browser address text box) Therefore, instead of entering a command and having a router prompt you for additional information, such as the IP address of a TFTP server as well as the filename, you can now put all of this information on a single command line Commands that reference configuration files and IOS images contain prefixes in front of the file type, as shown in Table 17-1 Let s take a look at an example For instance, say that you want to back up your router s configuration from RAM to NVRAM With the new syntax, you could type in the following:
IOS# copy system:running-config nvram:startup-config
You don t always have to put in the type; for instance, in this example, you could easily have entered this:
IOS# copy running-config startup-config
In many cases, the IOS knows, based on the name of the file, which location you re referring to For example, when you use running-config, the IOS assumes you re referring to RAM, or system: as the location
TABLE 17-1
Location
bootflash flash flh ftp nvram rcp scp slot0 slot1 system tftp
Description
Bootflash memory Flash memory on the motherboard Flash load helper log files FTP server Nonvolatile RAM (NVRAM) Remote Copy Protocol (RCP) server Secure Copy (SCP) uses RCP through an SSH tunnel PCMCIA slot 0 PCMCIA slot 1 RAM TFTP server
File Locations
Router Con guration Files
To view the active configuration, you can use this command:
IOS# more system:running-config
If you want to delete a file in flash, such as a backed-up configuration file, use the following command:
IOS# delete flash:file_name
You ll be asked to verify whether you want to delete the file You can also use this command to delete any file in flash The older style of entering configuration and IOS commands is still supported along with the new one One command that I constantly use in production environments is the write memory command, which can be abbreviated as wr This performs the equivalent of the copy runningconfig startup-config command, but it requires only two keystrokes to perform! Please note, however, that the older command syntax is not supported on Cisco exams!
Review of Con guration Files
It is important that you understand what action the IOS will take when it is either backing up or restoring a configuration file to a particular location Table 17-2 summarizes this information for the routers
TABLE 17-2
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