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To examine the active or running configuration on an IOS device, use the show running-config command You must be in Privilege EXEC mode to execute this command Here is an example of this command from a Cisco router:
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Router# show running-config Building configuration Current configuration: ! version 120 no service udp-small-servers no service tcp-small-servers ! hostname Router
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IOS Operation and Veri cation
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Notice the references to Building configuration and Current configuration in this example Both of these refer to the configuration in RAM
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Backing Up Your Configuration File Locally
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Configuration files are stored in NVRAM for both switches and routers When an IOS device boots up, the IOS operating system loads the configuration from NVRAM and places it in RAM However, as mentioned in the Running and Startup Configuration introduction to this section, the running configuration in RAM is not automatically saved to NVRAM: if you turn off your IOS device without saving its configuration, your newly implemented changes will disappear To save the active configuration to NVRAM, you must execute the copy running-config startup-config Privilege EXEC mode command Upon executing this command, the IOS device takes the active configuration in RAM and saves it to NVRAM In this process, the old configuration file in NVRAM is overwritten Here is an example of this command:
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IOS# copy running-config startup-config Destination filename [startup-config] Building configuration [OK] IOS#
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When executing this command, you are asked for a filename for the configuration file the default is startup-config This is the filename the IOS looks for when booting up You can change the name for backup revisioning purposes (different versions of the backed-up configuration), but make sure that your most current configuration is saved as startup-config On the IOS device, you can view the saved configuration in NVRAM with the show startup-config Privilege EXEC mode command A shortcut to save the IOS s configuration to NVRAM is the write memory command: you can abbreviate this to just wr However, this command is not supported on the exam On real IOS devices, I use wr all the time to quickly save a configuration To see the configuration file stored in NVRAM, use this command:
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Router# show startup-config Using 4224 out of 65536 bytes ! version 113
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11: Cisco IOS Software
no service udp-small-servers no service tcp-small-servers ! hostname Router
One difference between this output and that from the show running-config command is the first line of output Using 4224 out of 65536 bytes refers to the amount of NVRAM currently used by the saved configuration file
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You should know that IOS devices do not automatically save con guration changes You must manually enter the copy runningcon g startup-con g command from Privileged EXEC modeThis command backs up your con guration to NVRAM
Also, any time you want to examine or manipulate a con guration, you must be in Privilege EXEC modeThe show running-con g command displays the IOS device s currently running con guration in RAM
Restoring Your Configuration File Locally
To restore your configuration from NRAM to RAM, use the copy startupconfig running config command from Privilege EXEC mode, like this:
IOS# copy startup-config running-config Destination filename [running-config] 947 bytes copied in 0320 secs (2959 bytes/sec) IOS#
One important thing to note is that when you take a configuration file from any location and copy it to RAM, the IOS uses a merge process to load in the configuration file from the source, overwriting matching commands in RAM and adding new commands that don t exist in RAM, but not deleting commands that don t exist in NVRAM but do exist in RAM 17 will go into this process in more depth
IOS Operation and Veri cation
Device Version Information
If you want to see general information about your IOS device its model number, the types of interfaces, the different kinds and amounts of memory, its software version, where the IOS located and loaded itself and its configuration file, as well as the configuration settings you can use the show version command
Be familiar with the output the uptime, the amount of RAM, NVRAM, of the show version command, including ash, the type and number of interfaces, what is displayed, such as the IOS version, and the con guration register value Here is an example of this command on a Cisco router:
Router> show version Cisco Internetwork Operating System Software IOS (tm) 3600 Software (C3640-JS-M), Version 120(3c), RELEASE SOFTWARE (fc1) Copyright (c) 1986-1999 by cisco Systems, Inc Compiled Tue 13-Apr-99 07:39 by phanguye Image text-base: 0x60008918, data-base: 0x60BDC000 ROM: System Bootstrap, Version 111(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) Router uptime is 2 days, 11 hours, 40 minutes System restarted by power-on System image file is "flash:c3640-js-mz120-3cbin" cisco 3640 (R4700) processor (revision 0x00) with 49152K/16384K bytes of memory 1 FastEthernet/IEEE 8023 interface(s) 8 Low-speed serial(sync/async) network interface(s) 1 Channelized T1/PRI port(s) DRAM configuration is 64 bits wide with parity disabled 125K bytes of non-volatile configuration memory 32768K bytes of processor board System flash (Read/Write) Configuration register is 0x2102