qr code c# sample 17: IOS Device Management in Objective-C

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17: IOS Device Management
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To back up your IOS image, you ll use the copy flash URL command Optionally, you can specify the name of the IOS in flash in the command line The URL specifies a URL-style syntax and includes the protocol, such as TFTP, the IP address of the server, possibly the directory to put it in, and the name the image will be called on the server Optionally, you can just specify the protocol in the URL, and you ll be prompted for the rest of the information, like this:
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Router# copy flash tftp Source filename [] c3640-js-mz120-11 Address or name of remote host [] 192168110 Destination filename [c3640-js-mz120-11] !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 6754416 bytes copied in 64452 secs (105537 bytes/sec)
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As the image is backed up, you should see a bunch of exclamation points filling up your screen (as shown here) this indicates the successful copy of a packet If you see a sequence of periods () instead, this indicates a failure After a successful copy operation, you should see the number of bytes copied as well as how long it took Compare the number of bytes copied to the file length in flash to verify that the copy was actually successful
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1705The CD contains a multimedia demonstration of backing up the IOS flash image on a router
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If you want to upgrade your IOS or load a previously saved IOS image, you ll need to place the IOS image on an external server and use the copy URL flash command You ll be prompted for the same information you needed when you used the copy flash tftp command; however, the process that takes place after you enter your information is different After you enter your information, the IOS first verifies that the image exists on the TFTP server If the file exists on the server, the IOS then asks you if you want to erase flash Answer y if you don t have enough space in flash for the older image(s) as well as the new one If you answer y, flash is erased and reprogrammed; as this step proceeds, you will see a list of e s appear on the screen
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After flash is initialized, your router pulls the IOS image from the TFTP server Just as in the copy operations with configuration files, a bunch of exclamation marks indicate successful copies, while periods indicate unsuccessful copies Here is example of loading an IOS image into your router:
Router# copy tftp flash Address or name of remote host [] 192168110 Source filename [] c3640-js-mz120-7 Destination filename [c3640-js-mz120-7] %Warning:There is a file already existing with this name Do you want to over write [confirm] y Accessing tftp://19216811/c3640-js-mz120-7 Erase flash: before copying [confirm] y Erasing the flash filesystem will remove all files! Continue [confirm] y Erasing device eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee erased Erase of flash: complete Loading c3640-js-mz120-7 from 19216811 (via FastEthernet0/0): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! [OK - 6754416/13508608 bytes] Verifying checksum OK (0xCAF2) 6754416 bytes copied in 66968 secs (102339 bytes/sec) Router#
In this example, the router noticed that the name of the image that exists on the TFTP server is the same name that is in flash and verifies that you want to overwrite it After the router copies the IOS image to flash, you must reboot your router in order for it to use the new image You can reboot your router in two ways: turn it off and back on, or use the Privilege EXEC reload command The first method is a hard reboot, and the second one is a soft reboot
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1706The CD contains a multimedia demonstration of loading an IOS flash image on a router If you place an incorrect image on your router for instance, a 3600 series image on a 2800 series router the router will not boot up You ll need to break into ROMMON mode and either do a TFTP boot or boot from the Mini-IOS in ROM (if this exists)
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