Network Device Configurations in Software

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Network Device Configurations
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The various network devices require specific configurations Hubs and switches will work if they are simply plugged in to the network and powered up This doesn't use all their potential features, however especially in the case of the many features of a switch Other network devices, as well, including firewalls, routers, and access servers, require configuration in order to work There are two types of configurations: first-time, and then recurring configurations for modifications
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First-Time Network Device Configurations
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When you connect a network device to a terminal and power it up for the first time, there will be no configuration in memory and the network device will go into the initial configuration dialog box You'll be prompted for specific information regarding the device's configuration Depending on the device being configured, this information may include any of the following: Host name Enable secret Enable password Virtual terminal password SNMP configurations Routing protocols Interface IP addresses You can also return a network device to this initial unconfigured state by typing write erase in privileged EXEC mode This command erases the current configuration in memory and allows you to start fresh
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Modifying Network Device Configurations
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Modifications can be made using the console port or through a Telnet session TipKeep in mind that if the network device is currently being used, any configurations done through Telnet or the console port are valid as soon as you press Enter Make sure, if you are configuring an interface from a Telnet session, you are not modifying the interface that you're connected to This could result in disconnection of your Telnet session If this happens, establish a connection through the console port and perform the necessary modifications Or have someone power the
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router off and then back on, which will eliminate the new config parameters that were not yet written to NVRAM An alternative method of modifying configurations is to use a TFTP server The network device configuration files are plain ASCII text The devices read their text files during boot-up and generate their running configuration files These text files can be saved as plain text on a TFTP server Using a screen editor, you can modify the files and reload them into the network device through TFTP Even if you decide to make configuration changes on-the-fly, without using a TFTP server, it's a good idea to TFTP your most recent configurations to a TFTP server as backup To TFTP a file to a TFTP server, you must first create the file in the directory the TFTP server is using, and verify that you have write privileges for that file The following commands illustrate the process of copying the configuration file of VelteNetwork Device (which is a router) to the TFTP server at 10456: VelteNetworkDevice#write network Remote host [ ] 10456 Name of configuration file to write [router-confg] velteconf Write file to velteconf on host 10456 [confirm] <ENTER> Writing velteconf:!!!!! [OK] After the file is modified, following are the commands used to copy it back into VelteNetworkDevice: VelteNetworkDevice#configure network Host or network configuration file [host] <ENTER> Address of remote host [255255255255] 10456 Name of configuration file [router-confg] velteconf Configure using velteconf from 10456 [confirm] <ENTER> Loading velteconf from 10456 (via Ethernet 0) !!!!!!!
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When you reboot a network device, the device can pull its system image from three places If you configure all three options, the network device will try to boot from the first option If that fails, it will try to boot from the second option and then from the third option, if necessary The three options are ROM, flash memory, and the network server READ-ONLY MEMORY (ROM) ROM is nonvolatile memory that can be read from but not written to by the microprocessor ROM contains a copy of the IOS that the network device is using When it boots up from ROM, the device is referring to the ROM chips The location of the ROM chips varies among network devices In high-end devices, the ROM chips can be upgraded to contain newer versions of the IOS These chips are read only and therefore do not contain any configurations you may have applied In most cases, you would boot from ROM as your last alternative This is because ROM typically is a subset of the Cisco IOS software, possibly lacking in protocols, features, and configurations of full IOS software Also, the software could be an older version if you have upgraded your router since it was purchased NoteThe Cisco 7200 Series and Cisco 7500 Series cannot boot from ROM FLASH MEMORY Flash memory is nonvolatile storage that can be electrically erased and programmed so that software images can be stored, rebooted, and written as necessary Flash memory contains the current version of the IOS running on the network device The show flash command reveals the image file currently supported in flash memory in addition to total memory and memory available on your network device Following is an example of output generated by the show flash command: vsigate#show flash System flash directory:
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File Length Name/status 1 3218108 c4500-is-mz_112-17bin [3218172 bytes used, 13559044 available, 16777216 total] 16384K bytes of processor board System flash (Read/Write) NETWORK SERVER A system image can also be loaded from a network server such as a TFTP server Network devices use the filename and TFTP server's IP address to determine the IOS file from which to boot To copy the current system image file from the network device to the TFTP Server, use the copy flash command in privileged EXEC mode: Router#copy flash tftp Make sure you have the TFTP file created and write privileges enabled To manually copy the file from the TFTP server to the network device, use the copy tftp command in privileged EXEC mode Flash will be erased to make room for the new image NoteYou can put comments in the file on the TFTP server by starting the line with an exclamation mark (!) When the file is copied to the network device, all lines beginning with the exclamation mark will be removed Here are the commands to configure the automatic sequential booting of the three options: VelteNetworkDevice(config)#boot system flash VelteNetworkDevice(config)#boot system rom VelteNetworkDevice(config)#boot system backupfile 10123 The order in which the commands are entered is the order they will be placed in the configuration file upon failure of the previous command Following these or any other configuration changes, do a write memory to write the updated configurations to NVRAM NVRAM is nonvolatile RAM that retains its content when the network device is powered off It can be read and written to by a microprocessor and therefore is used to store the devices configurations
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