CCNA RSE Lab: 10.3.1.10 Lab – Managing Device Configuration Files Using TFTP, Flash, and USB

CCNA RSE Lab: 10.3.1.10 Lab – Managing Device Configuration Files Using TFTP, Flash, and USB

Topology

ccna-rse-lab-managing-device-configuration-files-using-tftp-flash-usb-1

Addressing Table

Device Interface IP Address Subnet Mask Default Gateway
R1 G0/1 192.168.1.1 255.255.255.0 N/A
S1 VLAN 1 192.168.1.11 255.255.255.0 192.168.1.1
PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

Objectives
Part 1: Build the Network and Configure Basic Device Settings
Part 2: (Optional) Download TFTP Server Software
Part 3: Use TFTP to Back Up and Restore the Switch Running Configuration
Part 4: Use TFTP to Back Up and Restore the Router Running Configuration
Part 5: Back Up and Restore Running Configurations Using Router Flash Memory
Part 6: (Optional) Use a USB Drive to Back Up and Restore the Running Configuration

Background / Scenario
Cisco networking devices are often upgraded or swapped out for a number of reasons. It is important to maintain backups of the latest device configurations, as well as a history of configuration changes. A TFTP server is often used to backup configuration files and IOS images in production networks. A TFTP server is a centralized and secure method used to store the backup copies of the files and restore them as necessary. Using a centralized TFTP server, you can back up files from many different Cisco devices.

In addition to a TFTP server, most of the current Cisco routers can back up and restore files locally from CompactFlash (CF) memory or a USB flash drive. The CF is a removable memory module that has replaced the limited internal flash memory of earlier router models. The IOS image for the router resides in the CF memory, and the router uses this IOS Image for the boot process. With the larger size of the CF memory, additional files can be stored for backup purposes. A removable USB flash drive can also be used for backup purposes.

In this lab, you will use TFTP server software to back up the Cisco device running configuration to the TFTP server or flash memory. You can edit the file using a text editor and copy the new configuration back to a Cisco device.

Note: The routers used with CCNA hands-on labs are Cisco 1 941 Integrated Services Routers (ISRs) with Cisco IOS Release 1 5.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 1 5.0(2) (lanbasek9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers.

Note: Make sure that the routers and switches have been erased and have no startup configurations. If you are unsure, contact your instructor.

Instructor Note: Refer to the Instructor Lab Manual for the procedures to initialize and reload devices.

Instructor Note: If time is limited, the lab can be divided up and performed over multiple sessions. For example, after building the network in Part 1 , any combination of the remaining lab parts can be performed in any order.

Required Resources

  • 1 Router (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)
  • 1 Switch (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable)
  • 1 PC (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term, and a TFTP server)
  • Console cables to configure the Cisco IOS devices via the console ports
  • Ethernet cables as shown in the topology
  • USB flash drive (Optional)

Part 1: Build the Network and Configure Basic Device Settings

In Part 1, you will set up the network topology and configure basic settings, such as the interface IP addresses for router R1, switch S1 and PC-A.

Step 1: Cable the network as shown in the topology.
Attach the devices as shown in the topology diagram, and cable as necessary.

Step 2: Initialize and reload the router and switch.

Step 3: Configure basic settings for each device.
a. Configure basic device parameters as shown in the Addressing Table.
b. To prevent the router and switch from attempting to translate incorrectly entered commands as though they were host names, disable DNS lookup.
c. Assign class as the privileged EXEC encrypted password.
d. Configure the passwords and allow login for console and vty lines using the cisco as the password.
e. Configure the default gateway for the switch.
f. Encrypt the clear text passwords.
g. Configure the IP address, subnet mask, and default gateway for PC-A.

Step 4: Verify connectivity from PC-A.
a. Ping from PC-A to S1.
b. Ping from PC-A to R1 .
If the pings are not successful, troubleshoot the basic device configurations before continuing.

Part 2: (Optional) Download TFTP Server Software

A number of free TFTP servers are available on the Internet for download. The Tftpd32 server is used with this lab.

Note: Downloading a TFTP server from a website requires Internet access.

Step 1: Verify availability of a TFTP server on PC-A.
a. Click the Start menu and select All Programs.
b. Search for a TFTP server on PC-A.
c. If a TFTP server is not found, a TFTP server can be downloaded from the Internet.

Step 2: Download a TFTP server.
a. Tftpd32 is used in this lab. This server can be downloaded from the following link: http://tftpd32.jounin.net/tftpd32_download.html
b. Choose the appropriate version for your system and install the server.

Part 3: Use TFTP to Back Up and Restore the Switch Running Configuration

Step 1: Verify connectivity to switch S1 from PC-A.
The TFTP application uses the UDP Layer 4 transport protocol, which is encapsulated in an IP packet. For TFTP file transfers to function, there must be Layer 1 and 2 (Ethernet, in this case) and Layer 3 (IP) connectivity between the TFTP client and the TFTP server. The LAN topology in this lab uses only Ethernet at Layers 1 and 2. However, TFTP transfers can also be accomplished over WAN links that use other Layer 1 physical links and Layer 2 protocols. As long as there is IP connectivity between the client and server, as demonstrated by ping, the TFTP transfer can take place. If the pings are not successful, troubleshoot the basic device configurations before continuing.

Note: A common misconception is that you can TFTP a file over the console connection. This is not the case because the console connection does not use IP. The TFTP transfer can be initiated from the client device (router or switch) using the console connection, but there must be IP connectivity between the client and server for the file transfer to take place.

Step 2: Start the TFTP server.
a. Click the Start menu and select All Programs.
b. Find and select Tftpd32 or Tftpd64. The following window displays that the TFTP server is ready.
ccna-rse-lab-managing-device-configuration-files-using-tftp-flash-usb-2
c. Click Browse to choose a directory where you have write permission, such as C:\Users\User1, or the Desktop.

Step 3: Explore the copy command on a Cisco device.
a. Console into switch S1 and, from the privileged EXEC mode prompt, enter copy ? to display the options for source or “from” location and other available copy options. You can specify flash: or flash0: as the source, however, if you simply provide a filename as the source, flash0: is assumed and is the default. Note that running-config is also an option for the source location.

b. Use the ? to display the destination options after a source file location is chosen. The flash: file system for S1 is the source file system in this example.

Step 4: Transfer the running-config file from switch S1 to TFTP server on PC-A.
a. From the privileged EXEC mode on the switch, enter the copy running-config tftp: command. Provide the remote host address of the TFTP server (PC-A), 192.168.1.3. Press Enter to accept default destination filename (s1 -confg) or provide your own filename. The exclamation marks (!!) indicate the transfer process is in progress and is successful.

The TFTP server also displays the progress during the transfer.
ccna-rse-lab-managing-device-configuration-files-using-tftp-flash-usb-3
Note: If you do not have permission to write to the current directory that is used by the TFTP server, the following error message displays:

You can change the current directory in TFTP server by clicking Browse and choosing a different folder.

Note: Other issues, such as a firewall blocking TFTP traffic, can prevent the TFTP transfer. Please check with your instructor for further assistance.

b. In the Tftpd32 server window, click Show Dir to verify that the s1 -confg file has been transferred to your current directory. Click Close when finished.
ccna-rse-lab-managing-device-configuration-files-using-tftp-flash-usb-4

Step 5: Create a modified switch running configuration file.
The saved running configuration file, s1 -confg, can also be restored to the switch by using the copy command from the switch. The original or a modified version of the file can be copied to the flash file system of the switch.

a. Navigate to the TFTP directory on PC-A by using the file system of PC-A, and then locate the s1 -confg file. Open this file using a text editor program, such as WordPad.

b. With the file open, locate the hostname S1 line. Replace S1 with Switch1 . Delete all the self-generated crypto keys, as necessary. A sample of the keys is displayed below. These keys are not exportable and can cause errors while updating the running configuration.

c. Save this file as a plain text file with a new filename, Switch1 -confg.txt, in this example.

Note: When saving the file, an extension, such as .txt, may be added to the filename automatically.

d. In the Tftpd32 server window, click Show Dir to verify that the Switch1 -confg.txt file is located in the current directory.

Step 6: Upload running configuration file from TFTP server to switch S1 .
a. From the privileged EXEC mode on the switch, enter the copy tftp running-config command. Provide the remote host address of the TFTP server, 192.168.1.3. Enter the new filename, Switch1 -confg.txt. The exclamation mark (!) indicates the transfer process is in progress and is successful.

After the transfer has completed, the prompt has changed from S1 to Switch1 , because the running configuration is updated with the hostname Switch1 command in the modified running configuration.

b. Enter the show running-config command to examine running configuration file.

Note: This procedure merges the running-config from the TFTP server with the current running-config in the switch or router. If changes were made to the current running-config, the commands in the TFTP copy are added. Alternatively, if the same command is issued, it updates the corresponding command in the switch or router current running-config.

If you want to completely replace the current running-config with the one from the TFTP server, you must erase the switch startup-config and reload the device. You will then need to configure the VLAN 1 management address, so there is IP connectivity between the TFTP server and the switch.

Part 4: Use TFTP to Back Up and Restore the Router Running Configuration

The backup and restore procedure from Part 3 can also be performed with a router. In Part 4, the running
configuration file will be backed up and restored using a TFTP server.

Step 1: Verify connectivity to router R1 from PC-A.
If the pings are not successful, troubleshoot the basic device configurations before continuing.

Step 2: Transfer the running configuration from router R1 to TFTP server on PC-A.
a. From the privileged EXEC mode on R1 , enter the copy running-config tftp command. Provide the remote host address of the TFTP server, 192.168.1.3, and accept the default filename.
b. Verify that the file has been transferred to the TFTP server.

Step 3: Restore the running configuration file to the router.
a. Erase the startup-config file on the router.
b. Reload the router.
c. Configure the G0/1 interface on the router with an IP address 192.168.1.1 .
d. Verify connectivity between the router and PC-A.
e. Use the copy command to transfer the running-config file from the TFTP server to the router. Use running-config as the destination.
f. Verify the router has updated the running-config.

Part 5: Back Up and Restore Configurations Using Router Flash Memory

For the 1941 and other newer Cisco routers, there is no internal flash memory. The flash memory for these routers uses CompactFlash (CF) memory. The use of CF memory allows for more available flash memory and easier upgrades without the need to open the router case. Besides storing the necessary files, such as IOS images, the CF memory can store other files, such as a copy of the running configuration. In Part 5, you will create a backup copy of the running configuration file and save it on the CF memory on the router.

Note: If the router does not use CF, the router may not have enough flash memory for storing the backup copy of running configuration file. You should still read through the instructions and become familiar with the commands.

Step 1: Display the router file systems.
The show file systems command displays the available file systems on the router. The flash0: file system is the default file system on this router as indicated by the asterisk (*) symbol (at the beginning of the line). The hash (#) sign (at the end of the highlighted line) indicates that it is a bootable disk. The flash0: file system can also be referenced using the name flash:. The total size of the flash0: is 256 MB with 62 MB available. Currently the flash1: slot is empty as indicated by the under the headings, Size (b) and Free (b). Currently flash0: and nvram: are the only available file systems.

Where is the startup-config file located?
nvram:

Note: Verify there is at least 1 MB (1 ,048,576 bytes) of free space. If there is not enough space in the flash memory, please contact your instructor for further instructions. You can determine the size of flash memory and space available using the show flash or dir flash: command at the privileged EXEC prompt.

Step 2: Copy the router running configuration to flash.
A file can be copied to flash by using the copy command at the privileged EXEC prompt. In this example, the file is copied into flash0:, because there is only one flash drive available as displayed in the previous step, and it is also the default file system. The R1 -running-config-backup file is used as the filename for the backup running configuration file.

Note: Remember that filenames are case-sensitive in the IOS file system.

a. Copy the running configuration to flash memory.

b. Use dir command to verify the running-config has been copied to flash.

c. Use the more command to view the running-config file in flash memory. Examine the file output and scroll to the Interface section. Notice the no shutdown command is not included with the GigabitEthernet0/1. The interface is shut down when this file is used to update the running configuration on the router.

Step 3: Erase the startup configuration and reload the router.

Step 4: Restore the running configuration from flash.
a. Verify the router has the default initial configuration.
b. Copy the saved running-config file from flash to update the running-config.

c. Use the show ip interface brief command to view the status of the interfaces. The interface GigabitEthernet0/1 was not enabled when the running configuration was updated, because it is administratively down.

The interface can be enabled using the no shutdown command in the interface configuration mode on the router.

Another option is to add the no shutdown command for the GigabitEthernet0/1 interface to the saved file before updating the router running configuration file. This will be done in Part 6 using a saved file on a USB flash drive.

Note: Because the IP address was configured by using a file transfer, TFTP is listed under the Method heading in the show ip interface brief output.

Part 6: (Optional) Use a USB Drive to Back Up and Restore the Running Configuration

A USB flash drive can be used to backup and restore files on a router with an available USB port. Two USB ports are available on the 1941 routers.

Note: USB ports are not available on all routers, but you should still become familiar with the commands.

Note: Because some ISR G1 routers (1841, 2801 , or 2811) use File Allocation Table (FAT) file systems, there is a maximum size limit for the USB flash drives that can be used in this part of the lab. The recommended maximum size for an ISR G1 is 4 GB. If you receive the following message, the file system on the USB flash drive may be incompatible with the router or the capacity of the USB flash drive may have exceed maximum size of the FAT file system on the router.

Step 1: Insert a USB flash drive into a USB port on the router.
Notice the message on the terminal when inserting the USB flash drive.

Step 2: Verify that the USB flash file system is available.

Step 3: Copy the running configuration file to the USB flash drive.
Use the copy command to copy the running configuration file to the USB flash drive.

Step 4: List the file on the USB flash drive.
Use the dir command (or show command) on the router to list the files on the USB flash drive. In this sample, a flash drive was inserted into USB port 0 on the router.

Step 5: Erase the startup-config and reload the router.

Step 6: Modify the saved file.
a. Remove the USB drive from the router.

b. Insert the USB drive into the USB port of a PC.

c. Modify the file using a text editor. The no shutdown command is added to the GigabitEthernet0/1 interface. Save the file as a plain text file on to the USB flash drive.

d. Remove the USB flash drive from the PC safely.

Step 7: Restore the running configuration file to the router.
a. Insert the USB flash drive into a USB port on the router. Notice the port number where the USB drive has been inserted if there is more than one USB port available on the router.

b. List the files on the USB flash drive.

c. Copy the running configuration file to the router.

d. Verify that the GigabitEthernet0/1 interface is enabled.

The G0/1 interface is enabled because the modified running configuration included the no shutdown command.

Reflection

1. What command do you use to copy a file from the flash to a USB drive?
copy flash:filename usbflash0:

2. What command do you use to copy a file from the USB flash drive to a TFTP server?
copy usbflash0:filename tftp:

Router Interface Summary Table

Router Interface Summary
Router Model Ethernet Interface#1 Ethernet Interface#2 Serial Interface
#1
Serial Interface
#2
1800 Fast Ethernet 0/0
(Fa0/0)
Fast Ethernet 0/1
(Fa0/1)
Serial 0/0/0
(S0/0/0)
Serial 0/0/1
(S0/0/1)
1900 Gigabit Ethernet 0/0(G0/0) Gigabit Ethernet 0/1(G0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2801 Fast Ethernet 0/0
(F0/0)
Fast Ethernet 0/1
(F0/1)
Serial 0/1 /0 (S0/1 /0) Serial 0/1 /1 (S0/1 /1)
2811 Fast Ethernet 0/0
(F0/0)
Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2900 Gigabit Ethernet 0/0(G0/0) Gigabit Ethernet 0/1(G0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many interfaces the router has. Rather than list all combinations of configurations for each router class, this table includes identifiers for the possible combinations of Ethernet and serial interfaces in the device. The table does not include any other type of interface, even though a specific router might contain one. For example, for an ISDN BRI interface, the string in parenthesis is the legal abbreviation that can be used in Cisco IOS commands to represent the interface.

Device Configs

Router R1

Switch S1

More Resources

About the author

Scott

Leave a Comment