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The default location of IOS images is in flash Some IOS devices have flash built into the motherboard, some use PCMCIA cards for storage, and some use a combination of both At times, you will have to deal with the device s flash when you want to perform an upgrade, for instance To view your files in flash, use the show flash command:
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IOS# show flash -#- --length-- -----date/time------ path 1 0 Sep 18 2007 15:42:20 +00:00 Trashes 2 4096 Sep 18 2007 15:42:20 +00:00 _Trashes 3 12292 Sep 18 2007 15:55:12 +00:00 DS_Store 4 1159 Sep 9 2007 18:01:42 +00:00 udpphdf 5 4787200 Oct 3 2007 14:33:50 +00:00 sdmtar 6 2679 Sep 9 2007 18:01:28 +00:00 ipphdf 7 113152 Oct 3 2007 14:34:02 +00:00 hometar 8 2227 Dec 4 2007 16:02:28 +00:00 pre_autoseccfg 16 23787192 Sep 9 2007 17:45:30 +00:00 c1841-advipservicesk9-mz124-6T7bin 31946752 bytes available (31922176 bytes used)
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In this example, you can see that a router s flash holds many files Below the list of files, you can see how much flash is used (about 32MB), how much is available (about 32MB), and the total amount of flash on the router (64MB) You can also see how much flash you have installed on your IOS device with the show version command
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Use the show ash, show version, or dir command to see how
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much ash memory is installed on your IOS device
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In addition to using the show flash command, you can also use the dir command:
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IOS# dir Directory of flash:/ 1 drw0 2 -rw4096 16 -rw23787192
Sep 18 2007 15:42:20 +00:00 Sep 18 2007 15:42:20 +00:00
Trashes _Trashes
Sep 9 2007 17:45:30 +00:00 c1841-advipservicesk9-mz124-6T7bin 63868928 bytes total (31946752 bytes free)
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1704The CD contains a multimedia demonstration of viewing the contents of flash on a router
Naming Conventions for IOS Images
Cisco has implemented a naming convention for its IOS images, allowing
you to see the platform, software version, and features included in the image just by looking at the name of the image file As an example, consider the image name from the preceding show flash command: c1841-advipservicesk9-mz124-6T7bin, which is from a router Here s an explanation of the nomenclature that Cisco uses for their IOS image names: The c1841 refers to the name of the platform on which the image will run This is important because different router models have different processors, and an image compiled for one processor or router model will typically not run on a different model Therefore, it is very important that you load the appropriate image on your device
The advipservicesk9 refers to the features included in this IOS version,
commonly referred to as the feature set In this example, the IOS is the advanced IP services and the k9 refers to the inclusion of encryption support
The mz or z means that the image is compressed and must be uncompressed
before loading/running If you see l (the letter l, not the number 1) here, this indicates where the IOS image is run from The l indicates a relocatable image and that the image can be run from RAM Remember that some images can run directly from flash, depending on the router model
IOS Image Files
The 124-6T7 indicates the software version number of the IOS In this
instance, the version is 124(6)T7 Images names with T indicate new features, and without the T the mainline (only bug fixes are made to it)
Finally, the bin at the end indicates that this is a binary image
The naming nomenclature discussed here applies to IOS images that are either included on your IOS device when you buy it from Cisco or applied when you download them from Cisco s web site However, the name, in and of itself, has no bearing on the actual operation of the IOS when it is loaded on your IOS device For instance, you can download an image from Cisco and rename it poorperformancebin, and this will have no impact on the IOS device s performance
Before Upgrading the IOS Image
This and the next section discuss how to upgrade and back up the IOS software on your router Before you upgrade the IOS on your device, you should first back up the existing image to an external server, for two reasons First, your flash might not be large enough to support two images the old one and the new If you load the new one and you experience problems with it, you ll probably want to load the old image back onto your device Second, Cisco doesn t keep every software version available on its web site Older versions of the IOS are hard to locate, so if you are upgrading from an old version of the IOS, I would highly recommend backing it up first Before you back up your IOS image to an external server, you should perform the following checks:
Is the server reachable (test with the ping command) Is there enough disk space on the server to hold the IOS image Does the server support the file nomenclature that you want to use Does the file have to exist on the server before you can perform the copy
(This is true with certain TFTP Unix servers) Once you have performed these checks, you are ready to continue with the backup process
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