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You can copy your running-config or startup-config configuration file to flash, like this:
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IOS# copy running-config|startup-config flash:file_name
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This allows you to have multiple configuration files stored locally on your IOS device; however, when booting up, your IOS device, by default, will use the startupconfig file in NVRAM to load its configuration It is not common practice to copy configuration files to flash; for exam purposes, however, this is not where you back them up However, I commonly do this when an FTP or TFTP server currently isn t reachable and I am too lazy to copy the configuration to the Windows Notepad application You can also back up your configuration to an external server This requires you to have the server software on a server or PC and IP configured correctly on your IOS device in order to access the server The syntax looks like this on your IOS device:
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IOS# copy running-config URL_location
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For example, to back up your configuration file to a TFTP server, the configuration would look like this:
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IOS# copy running-config tftp://192168110/mybackupfiletxt
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The configuration is backed up to an ASCII text file If you don t supply the full URL, just the protocol information, you ll be prompted for the additional information, like this:
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IOS# copy running-config tftp Address or name of remote host [] 192168110 Destination filename [router-confg] mybackupfilecfg !! 781 bytes copied in 58 secs (156 bytes/sec) IOS#
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If the filename already exists on the server, the server overwrites the old file After entering this information, you should see bang symbols (!) indicating the successful transfer of UDP segments to the TFTP server If you see periods (), this indicates an unsuccessful transfer Plus, upon a successful transfer, you should also see how many bytes were copied to the server
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1701The CD contains a multimedia demonstration of backing up the configuration file of a router
17: IOS Device Management
Restoring Con guration Files
There may be situations when you have misconfigured your router or switch and want to take a saved configuration file and load it back into your Cisco device You can do this by reversing the source and destination information in the copy command:
IOS# copy URL_location running-config|startup-config
Three variations of the copy command can restore your configuration A TFTP server is used in this example for the first two options Here is the first one:
IOS# copy tftp startup-config Address or name of remote host [] 192168110 Source filename [] mybackupfilecfg Destination filename [startup-config] Accessing tftp://192168110/mybackupfilecfg Loading mybackupfilecfg from 192168110 (via Ethernet0): ! [OK - 781/1024 bytes] [OK] 781 bytes copied in 11216 secs (71 bytes/sec)
In this example, the configuration file is copied from a TFTP server to NVRAM (the startup-config file); if the file already exists in NVRAM, it will be overwritten You can also restore your configuration from a TFTP server to active memory:
IOS# copy tftp running-config
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1702The CD contains a multimedia demonstration of restoring the configuration file on a router There is one main difference between moving the configuration from TFTP to NVRAM and moving it from TFTP to RAM With the former method, the file in NVRAM is replaced with the one being copied; with the latter method, a merge process is used During a merge process, the IOS updates commands that are common to both places the new file and in RAM The IOS also executes any new commands it finds in the uploaded configuration file and adds them to the runningconfig However, the IOS does not delete any commands in RAM that it does not find in the uploaded configuration file In other words, this is not a replacement process As an example, assume that you have a configuration file on a TFTP server that has IPX and IP information in it, but your RAM configuration has IP and AppleTalk In this example, the router updates the IP configuration, adds the IPX commands, but leaves the AppleTalk commands as they are
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