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ccna 200 301 volume 2 pdf free.Destination filename [startup-config]? 3297 bytescopied in 0.492 secs(6701 bytes/sec)!13) User changes the config register back to itsnormal 0x2102 Rl# configure terminal Enter configuration commands, one per line. end with CNTL/Z. rl( config) # iponfig-reg 0x2102 Rl(config)# AZ Rl#Note that these last few steps are very important. Remember that this process causes the router to skip startup-config and boot directly, so itis clearly disruptive to the normal operation of the router, even more than the time needed to complete the process. copy startup-config running-config commandcommand causes the router to ignore the startup-config file when booting the IOS. Also prepare the router for the next reload by setting the configuration registerThe command "copy startup-config running-config" causes the router to ignore the startup-config file when booting the IOS.Tip: When using this process, finally, take a moment to check the status of the router interface. Depending on the current state of the cabling and the state of the connected devices, the copyrunning-configstartup-config command may cause some interfaces to remain off. Therefore, be sure to check and use the no-shutdown interface subcommand to enable any interface. 20.2.3 Management Configuration Files Cisco routers and switches happen to have two different configuration files: a startup-config file, which holds the configuration used each time the device boots, and a running-config file, which holds the configuration currently in use in RAM. The last three sections of this chapter review the key elements of these two configuration files. It also discusses the copy command and how to use it to copy the contents of the configuration file. The section concludes with a brief description of the setup process for the router to build a startup-config file. The Basics of Configuration Files Cisco IOS stores a collection of configuration commands in a configuration file. In fact, the router uses multiple configuration files: a startup-config file, which is used at power-up, and another configuration file, which is the running configuration file currently in use and stored in RAM. Table 20-4 lists the names, purposes, and storage locations of the two files. /. Table 2. -4 Names and Purposes of the Two Main Cisco IOS Configuration Files 14.2 Base Content 419 ig running-conf stores the currently used configuration commands. This file is dynamically changed whenever someone enters a command in configuration mode RAM Essentially, when you use configuration mode, you can only change the running-config file. If you want to keep this configuration, you have to execute the copyrunning-config startup-config command, which rewrites the old startup-config file. Example 20-5 illustrates that these commands used in configuration mode change only the running configuration in RAM. The examples show the following concepts and steps. Step 1 The original bostname command on the router, and the startup-config file matches the running-config file. Step 2 The bostname command changes the host name, but only in the running-config file. Step 3 The showrunning-config and showstartup-config commands display the bostname command only briefly, indicating that the two configuration files are now different. Example 20.5 Changing the running-config file ,startup.config file remains the same 1Step 1 next (two commands) ! hannah# show running-config 1(lines omitted) hostname hannah ! (rest of lines omitted) hannah# show startup-config ! (lines omitted) hostname hannah ! (rest of lines omitted) !Step 2 next. Notice that the command prompt changesimmediately after !the hostname command. I hannah# configure terminal hannah (conf ig) #fiostname kris kris(config)# exit !ptep 3 next (two commands) ! kris# showrunning-config ! (lines omitted) hostname kris ! (rest of lines omitted -notice that the running configuration reflects the !changed hostname) kris# showstartup-config ! (lines omitted) hostname hannah ! (rest of lines omitted -notice that the changed configuration is not !shown in the startup config) Copying and erasing configuration files If you reload the router at the end of Example 20-5, the hostname becomes hannah, because the running-config file was not copied to the startup-config file. However, if you want to keep the new host name, kris, you can use the copy running-configstartup-config command, which will rewrite the current startup-config file so that it retains the currently running configuration file. You can use the IOScopy command to copy the files in the router. These files can be any files, but in most cases, the files 420 Chapter 20 Managing IOS Files files are either an IOS image or a configuration file. The most common use of the copy command for configuration files is to make a backup of the configuration than to copy running-config to startup-config to preserve changes. Either startup-config or running-config can be copied to the server or from router to router, as shown in Figure 20-5. Figure 20-5 Location of Copy and Results of Copy Operations The commands for copying the Cisco IOS configuration in the figure are summarized as shown below. copy(tftp I running-config| startup-config} {tftp|running-config| startup-config} The first set of parameters enclosed in brackets ({}) is the source" location, and the second set of parameters is the "destination" location.When a file is copied to an NVRAM or TFTP server, the copy command will always replace the current file. In other words, it erases the destination file and completely replaces the old file with the new one. However, when the copy command copies a configuration file to a running-config file in RAM, the configuration file in RAM is not replaced, but rather merged. The effect is that anything copied to RAM acts as if the commands were entered in the "source" configuration file in the order given by that configuration file.Who cares about that? Of course we do. If you change the running config, and then want to restore the previous startup-config file, then the copy startup-config running-config command may result in the two files not actually matching. The only way to ensure that the two configuration files match is to execute the reload command, which allows the router to reload or reboot, which wipes the RAM, and then copies the startup-config to the RAM as part of the reload process.Tip: All Cisco I0S image and file management tasks, including the copy command, support IPv6. so if you have an IPv6 TFTP server set up on an IPv6 network, these copy commands will work seamlessly with the new protocol.