Show version: Displays information about the router’s internal components, including the IOS version, memory, configuration register information, etc.
The most common use of the show version command is to determine which version of the Cisco IOS a device is running. It actually offers several different uses. The show version command is one of the most popular fact-gathering commands. The example displays a sample of the show version command executed at a Cisco 2514 router as follows.
Example: show version Command Output
|Cisco Internetwork Operating System Software|
|IOS ™ 2500 Software (C2500-JS-L), Version 11.3(6), RELEASE SOFTWARE (fc1)|
|Copyright © 1986-1998 by cisco Systems, Inc.|
|Compiled Tue 06-Oct-98 22:17 by kpma|
|Image text-base: 0x03048CF4, data-base: 0x00001000|
|ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE|
|BOOTFLASH: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a),|
|RELEASE SOFTWARE (fc1)|
|A_StubR uptime is 25 minutes|
|System restarted by power-on|
|System image file is “flash:c2500-js-l_113-6.bin”, booted via flash|
|cisco 2500 (68030) processor (revision D) with 4096K/2048K bytes of memory.|
|Processor board ID 04203139, with hardware revision 00000000|
|X.25 software, Version 3.0.0.|
|SuperLAT software copyright 1990 by Meridian Technology Corp).|
|TN3270 Emulation software.|
|2 Ethernet/IEEE 802.3 interface(s)|
|2 Serial network interface(s)|
|32K bytes of non-volatile configuration memory.|
|16384K bytes of processor board System flash (Read ONLY)|
|Configuration register is 0x2102|
The output of the show version command provides a valuable set of information. Depending on your type of router, different hardware configuration and non-standard software options are displayed by the show version command. The following paragraph focuses on the general output of this command:
On the first few lines of output, the show version command displays the IOS version number and its internal name. The IOS internal name tells you about its capabilities and options. In the above example the IOS version is 11.3(6) and its name is C2500-JS-L. For a description of the IOS naming convention for different routers, refer to Cisco Connection Online (CCO).
In the second section of the output, the Bootstrap software and the RXBOOT image versions are displayed.
Next, you can see the system uptime, how the system last restarted, and the image filename and where it loaded from (the image filename is modifiable and may not be the name it was originally given by Cisco Systems). Please note that if the router encounters errors (such as software crashes) that force the router to reload, that information (reason for reload) will be displayed here and it can be quite useful to the Cisco TAC engineer.
The section near the bottom provides hardware information (processor type, memory size, existing controllers) and non-standard software options.
The very last line of the show version command’s output displays the value of the config-register in hex format.
Reference from http://www.ciscopress.com/
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