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Overview of IOS Process When Dealing with Configuration Files
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Here is a quick way of remembering whether the IOS is using a merge or overwrite process Anything copied into RAM uses a merge process,
whereas any other copy operation uses an overwrite process Be familiar with the commands listed in Table 17-2 and what they do
EXERCISE 17-1 Manipulating Your Router s Configuration Files
ON THE CD
The last few sections dealt with the router s configuration files and how you manipulate them This exercise will help you reinforce this material You ll perform these steps on a 2600 router using Boson s NetSim simulator You can find a picture of the network diagram for the simulator in the Introduction of this book After starting up the simulator, click the Lab Navigator button Next, double-click Exercise 17-1 and click the Load Lab button This will load the lab configuration based on the exercises in s 11 and 16 1 Access the 2600-1 router At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 2 Access the 2600-1 router s Privilege EXEC mode and view the running configuration Access Privilege EXEC mode: enable Use the show running-config command 3 Save your router s active configuration to NVRAM Verify the copy Use the copy running-config startup-config command Verify the copy: show startup-config 4 Change the hostname on the router to different and then reload the saved configuration from the NVRAM into RAM What is the hostname
Changes in Your Network
Access Configuration mode (configure terminal) and use the hostname different command to change the router s name to different Exit Configuration mode: end Restore your configuration with copy startup-config running-config Your prompt should change back to the previous name of the router (2600-1) (You might have to wait a few seconds for this to complete) 5 Erase your router s saved configuration in NVRAM Examine the configuration file in NVRAM Save the active configuration file to NVRAM Examine the configuration file in NVRAM Use the erase startup-config command to erase your configuration in NVRAM Press ENTER to confirm the erase Use the show startupconfig command to verify the configuration file was deleted 6 Save your configuration file in RAM to NVRAM View the newly saved configuration file in NVRAM Use the copy running-config startup-config command to save your configuration to NVRAM Use the show startup-config command to verify that your router s configuration was backed up from RAM to NVRAM Now you should be more comfortable with manipulating a router s configuration files In the next section, you will learn how you should deal with changes in your network
CERTIFICATION OBJECTIVE 1702
Changes in Your Network
When you decide to make changes to your network, including the addition or deletion of devices, you should always do some preparation work before you make the changes Making changes can cause things to not function correctly, or not function at all, so you should always prepare beforehand The following two sections cover the basics of handling changes
17: IOS Device Management
Adding Devices
Before you add an IOS device to your network, you should gather the following information and perform the following tasks: 1 Decide which IP address you ll assign to the device for management purposes 2 Configure the ports of the device, including the console and VTY ports 3 Set up your passwords for User and Privilege EXEC access 4 Assign the appropriate IP addresses to the device s interface(s) 5 Create a basic configuration on the device so that it can perform its job
Changing Devices
You will constantly be making configuration changes to your network to enhance performance and security Before you make any changes to your network, you should always back up your configuration files Likewise, before you perform a software upgrade on your Cisco device, you should always back up the old IOS image You should check a few things before loading the new image on your IOS device First, does the new image contain all of the features that your previous image had Or at least the features that you need Also, does your IOS device have enough flash and RAM to store and load the IOS image You need to check these items before proceeding to load the new image At times, you may need to upgrade the hardware or add a new module to your Cisco device Some devices require that you turn them off before doing the upgrade, while other devices can be left powered on It is extremely important that you read the installation manual that comes with the hardware before performing the installation If you install a hardware component into a device that requires that the device be turned off, and the device is running, you could damage your new component or, worse, electrocute yourself Remember that it is much easier to restore a backup copy than it is to re-create something from scratch Also, whenever you make changes, always test the change to ensure that your Cisco device is performing as expected
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