Managing Configuration Files Configuration Guide, Cisco IOS Release 15M&T
Managing Configuration Files
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Managing Configuration Files

Contents

Managing Configuration Files

Creating, loading, and maintaining configuration files enable you to generate a set of user-configured commands to customize the functionality of your Cisco routing device. For a complete description of the configuration file management commands, refer to the Cisco IOS Configuration Fundamentals Command Reference.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for Managing Configuration Files

  • You should have at least a basic familiarity with the Cisco IOS environment and the command-line interface.
  • You should have at least a minimal configuration running on your system. You can create a basic configuration file using the setup command (see Using Setup Mode to Configure a Cisco Networking Device for details).

Restrictions for Managing Configuration Files

  • Many of the Cisco IOS commands described in this document are available and function only in certain configuration modes on the router.
  • Some of the Cisco IOS configuration commands are only available on certain router platforms, and the command syntax may vary on different platforms.

Information About Managing Configuration Files

Types of Configuration Files

Configuration files contain the Cisco IOS software commands used to customize the functionality of your Cisco routing device (router, access server, switch, and so on). Commands are parsed (translated and executed) by the Cisco IOS software when the system is booted (from the startup-config file) or when you enter commands at the CLI in a configuration mode.

Startup configuration files (startup-config) are used during system startup to configure the software. Running configuration files (running-config) contain the current configuration of the software. The two configuration files can be different. For example, you may want to change the configuration for a short time period rather than permanently. In this case, you would change the running configuration using the configureterminal EXEC command but not save the configuration using the copyrunning-configstartup-config EXEC command.

To change the running configuration, use the configureterminal command, as described in the “Modifying the Configuration File at the CLI ” section. As you use the Cisco IOS configuration modes, commands generally are executed immediately and are saved to the running configuration file either immediately after you enter them or when you exit a configuration mode.

To change the startup configuration file, you can either save the running configuration file to the startup configuration using the copyrunning-configstartup-config EXEC command or copy a configuration file from a file server to the startup configuration (see the “Copying a Configuration File from a TFTP Server to the Router ” section for more information).

Configuration Mode and Selecting a Configuration Source

To enter configuration mode on the router, enter the configurecommand at the privileged EXEC prompt. The Cisco IOS software responds with the following prompt asking you to specify the terminal, memory, or a file stored on a network server (network) as the source of configuration commands:

Configuring from terminal, memory, or network [terminal]?

Configuring from the terminal allows you to enter configuration commands at the command line, as described in the following section. Configuring from memory loads the startup configuration file. See the “Reexecuting the Configuration Commands in the Startup Configuration File ” section for more information. Configuring from the network allows you to load and execute configuration commands over the network. See the “Copying a Configuration File from a TFTP Server to the Router ” section for more information.

Configuration File Changes Using the CLI

The Cisco IOS software accepts one configuration command per line. You can enter as many configuration commands as you want. You can add comments to a configuration file describing the commands you have entered. Precede a comment with an exclamation point ( !). Because comments are not stored in NVRAM or in the active copy of the configuration file, comments do not appear when you list the active configuration with theshowrunning-configormoresystem:running-config EXEC command. Comments do not display when you list the startup configuration with the showstartup-config or morenvram:startup-config EXEC mode command. Comments are stripped out of the configuration file when it is loaded onto the router. However, you can list the comments in configuration files stored on a File Transfer Protocol (FTP), remote copy protocol (rcp), or Trivial File Transfer Protocol (TFTP) server. When you configure the software using the CLI, the software executes the commands as you enter them.

Location of Configuration Files

Configuration files are stored in the following locations:

  • The running configuration is stored in RAM.
  • On all platforms except the Class A Flash file system platforms, the startup configuration is stored in nonvolatile random-access memory (NVRAM).
  • On Class A Flash file system platforms, the startup configuration is stored in the location specified by the CONFIG_FILE environment variable (see the “Specifying the CONFIG_FILE Environment Variable on Class A Flash File Systems” section). The CONFIG_FILE variable defaults to NVRAM and can be a file in the following file systems:
    • nvram: (NVRAM)
    • bootflash: (internal Flash memory)
    • slot0: (first PCMCIA slot)
    • slot1: (second PCMCIA slot)

Copy Configuration Files from a Network Server to the Router

You can copy configuration files from a TFTP, rcp, or FTP server to the running configuration or startup configuration of the router. You may want to perform this function for one of the following reasons:

  • To restore a backed-up configuration file.
  • To use the configuration file for another router. For example, you may add another router to your network and want it to have a similar configuration to the original router. By copying the file to the new router, you can change the relevant parts rather than re-creating the whole file.
  • To load the same configuration commands on to all the routers in your network so that all the routers have similar configurations.

The copy{ftp: | rcp: | tftp:system:running-configEXECcommand loads the configuration files into the router as if you were typing the commands in at the command line. The router does not erase the existing running configuration before adding the commands. If a command in the copied configuration file replaces a command in the existing configuration file, the existing command will be erased. For example, if the copied configuration file contains a different IP address in a particular command than the existing configuration, the IP address in the copied configuration will be used. However, some commands in the existing configuration may not be replaced or negated. In this case, the resulting configuration file will be a mixture of the existing configuration file and the copied configuration file, with the copied configuration file having precedence.

In order to restore a configuration file to an exact copy of a file stored on a server, you need to copy the configuration file directly to the startup configuration (using the copyftp:| rcp:| tftp:} nvram:startup-configcommand) and reload the router.

To copy configuration files from a server to a router, perform the tasks described in the following sections:

The protocol you use depends on which type of server you are using. The FTP and rcp transport mechanisms provide faster performance and more reliable delivery of data than TFTP. These improvements are possible because the FTP and rcp transport mechanisms are built on and use the TCP/IP stack, which is connection-oriented.

Copy a Configuration File from the Router to a TFTP Server

In some implementations of TFTP, you must create a dummy file on the TFTP server and give it read, write, and execute permissions before copying a file over it. Refer to your TFTP documentation for more information.

Copy a Configuration File from the Router to an rcp Server

You can copy configuration file from the router to an rcp server.

One of the first attempts to use the network as a resource in the UNIX community resulted in the design and implementation of the remote shell protocol, which included the remote shell (rsh) and remote copy (rcp) functions. Rsh and rcp give users the ability to execute commands remotely and copy files to and from a file system residing on a remote host or server on the network. The Cisco implementation of rsh and rcp interoperates with standard implementations.

The rcp copy commands rely on the rsh server (or daemon) on the remote system. To copy files using rcp, you need not create a server for file distribution, as you do with TFTP. You need only to have access to a server that supports the remote shell (rsh). (Most UNIX systems support rsh.) Because you are copying a file from one place to another, you must have read permission on the source file and write permission on the destination file. If the destination file does not exist, rcp creates it for you.

Although the Cisco rcp implementation emulates the functions of the UNIX rcp implementation--copying files among systems on the network--the Cisco command syntax differs from the UNIX rcp command syntax. The Cisco rcp support offers a set of copy commands that use rcp as the transport mechanism. These rcp copy commands are similar in style to the Cisco TFTP copy commands, but they offer an alternative that provides faster performance and reliable delivery of data. These improvements are possible because the rcp transport mechanism is built on and uses the TCP/IP stack, which is connection-oriented. You can use rcp commands to copy system images and configuration files from the router to a network server and vice versa.

You also can enable rcp support to allow users on remote systems to copy files to and from the router.

To configure the Cisco IOS software to allow remote users to copy files to and from the router, use the iprcmdrcp-enable global configuration command.

Restrictions

The rcp protocol requires a client to send a remote username on each rcp request to a server. When you copy a configuration file from the router to a server using rcp, the Cisco IOS software sends the first valid username it encounters in the following sequence:

  1. The username specified in the copy EXEC command, if a username is specified.
  2. The username set by the iprcmdremote-username global configuration command, if the command is configured.
  3. The remote username associated with the current tty (terminal) process. For example, if the user is connected to the router through Telnet and was authenticated through the username command, the router software sends the Telnet username as the remote username.
  4. The router host name.

For the rcp copy request to execute successfully, an account must be defined on the network server for the remote username. If the server has a directory structure, the configuration file or image is written to or copied from the directory associated with the remote username on the server. For example, if the system image resides in the home directory of a user on the server, you can specify that user name as the remote username.

Use the iprcmdremote-username command to specify a username for all copies. (Rcmd is a UNIX routine used at the super-user level to execute commands on a remote machine using an authentication scheme based on reserved port numbers. Rcmd stands for “remote command”). Include the username in the copy command if you want to specify a username for that copy operation only.

If you are writing to the server, the rcp server must be properly configured to accept the rcp write request from the user on the router. For UNIX systems, you must add an entry to the .rhosts file for the remote user on the rcp server. For example, suppose the router contains the following configuration lines:

hostname Rtr1
ip rcmd remote-username User0

If the router IP address translates to Router1.company.com, then the .rhosts file for User0 on the rcp server should contain the following line:

Router1.company.com Rtr1
Requirements for the rcp Username

The rcp protocol requires a client to send a remote username on each rcp request to a server. When you copy a configuration file from the router to a server using rcp, the Cisco IOS software sends the first valid username it encounters in the following sequence:

  1. The username specified in the copy EXEC command, if a username is specified.
  2. The username set by the iprcmdremote-username global configuration command, if the command is configured.
  3. The remote username associated with the current tty (terminal) process. For example, if the user is connected to the router through Telnet and was authenticated through the username command, the router software sends the Telnet username as the remote username.
  4. The router host name.

For the rcp copy request to execute, an account must be defined on the network server for the remote username. If the server has a directory structure, the configuration file or image is written to or copied from the directory associated with the remote username on the server. For example, if the system image resides in the home directory of a user on the server, specify that user name as the remote username.

Refer to the documentation for your rcp server for more information.

Copy a Configuration File from the Router to an FTP Server

You can copy a configuration file from the router to an FTP server.

Understanding the FTP Username and Password

The FTP protocol requires a client to send a remote username and password on each FTP request to a server. When you copy a configuration file from the router to a server using FTP, the Cisco IOS software sends the first valid username it encounters in the following sequence:

  1. The username specified in the copy EXEC command, if a username is specified.
  2. The username set by the ipftpusername global configuration command, if the command is configured.
  3. Anonymous.

The router sends the first valid password it encounters in the following sequence:

  1. The password specified in the copy command, if a password is specified.
  2. The password set by the ipftppassword command, if the command is configured.
  3. The router forms a password username @routername .domain . The variable username is the username associated with the current session, routername is the configured host name, and domain is the domain of the router.

The username and password must be associated with an account on the FTP server. If you are writing to the server, the FTP server must be properly configured to accept the FTP write request from the user on the router.

If the server has a directory structure, the configuration file or image is written to or copied from the directory associated with the username on the server. For example, if the system image resides in the home directory of a user on the server, specify that user name as the remote username.

Refer to the documentation for your FTP server for more information.

Use the ipftpusername and ipftppassword global configuration commands to specify a username and password for all copies. Include the username in the copy EXEC command if you want to specify a username for that copy operation only.

Configuration Files Larger than NVRAM

To maintain a configuration file that exceeds size of NVRAM, you should be aware of the information in the following sections:

Compressing the Configuration File

The servicecompress-config global configuration command specifies that the configuration file be stored compressed in NVRAM. Once the configuration file has been compressed, the router functions normally. When the system is booted, it recognizes that the configuration file is compressed, expands it, and proceeds normally. The morenvram:startup-config EXEC command expands the configuration before displaying it.

Before you compress configuration files, refer to the appropriate hardware installation and maintenance publication. Verify that your system’s ROMs support file compression. If not, you can install new ROMs that support file compression.

The size of the configuration must not exceed three times the NVRAM size. For a 128-KB size NVRAM, the largest expanded configuration file size is 384 KB.

The servicecompress-configglobal configurationcommand works only if you have Cisco IOS software Release 10 or later release boot ROMs. Installing new ROMs is a one-time operation and is necessary only if you do not already have Cisco IOS Release 10 in ROM. If the boot ROMs do not recognize a compressed configuration, the following message is displayed:

Boot ROMs do not support NVRAM compression Config NOT written to NVRAM

Storing the Configuration in Flash Memory on Class A Flash File Systems

On Class A Flash file system routers, you can store the startup configuration in Flash memory by setting the CONFIG_FILE environment variable to a file in internal Flash memory or Flash memory in a PCMCIA slot.

See the “Specifying the CONFIG_FILE Environment Variable on Class A Flash File Systems ” section for more information.

Care must be taken when editing or changing a large configuration. Flash memory space is used every time a copysystem:running-confignvram:startup-config EXEC command is issued. Because file management for Flash memory, such as optimizing free space, is not done automatically, you must pay close attention to available Flash memory. Use the squeeze command to reclaim used space. We recommend that you use a large-capacity Flash card of at least 20 MB.

Loading the Configuration Commands from the Network

You can also store large configurations on FTP, rcp, or TFTP servers and download them at system startup. To use a network server to store large configura tions, see the “Copying a Configuration File from the Router to a TFTP Server” and “Configure the Router to Download Configuration Files” sections for more information on these commands.

Configure the Router to Download Configuration Files

You can configure the router to load one or two configuration files at system startup. The configuration files are loaded into memory and read in as if you were typing the commands at the command line. Thus, the configuration for the router will be a mixture of the original startup configuration and the one or two downloaded configuration files.

Network Versus Host Configuration Files

For historical reasons, the first file the router downloads is called the network configuration file. The second file the router downloads is called the host configuration file. Two configuration files can be used when all of the routers on a network use many of the same commands. The network configuration file contains the standard commands used to configure all of the routers. The host configuration files contain the commands specific to one particular host. If you are loading two configuration files, the host configuration file should be the configuration file you want to have precedence over the other file. Both the network and host configuration files must reside on a network server reachable via TFTP, rcp, or FTP, and must be readable.

How to Manage Configuration File Information

Displaying Configuration File Information

To display information about configuration files, complete the tasks in this section:

SUMMARY STEPS

    1.    enable

    2.    show bootvar

    3.    more file-url

    4.    show running-config

    5.    show startup-config


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 show bootvar


    Example:
    Router# show bootvar
     

    Lists the contents of the BOOT environment variable, the name of the configuration file pointed to by the CONFIG_FILE environment variable, and the contents of the BOOTLDR environment variable.

     
    Step 3 more file-url


    Example:
    Router# more 10.1.1.1
     

    Displays the contents of a specified file.

     
    Step 4 show running-config


    Example:
    Router# show running-config
     

    Displays the contents of the running configuration file. (Command alias for themoresystem:running-config command.)

     
    Step 5 show startup-config


    Example:
    Router# show startup-config
     

    Displays the contents of the startup configuration file. (Command alias for the morenvram:startup-config command.)

    On all platforms except the Class A Flash file system platforms, the default startup-config file usually is stored in NVRAM. On the Class A Flash file system platforms, the CONFIG_FILE environment variable points to the default startup-config file. The CONFIG_FILE variable defaults to NVRAM.

     

    Modifying the Configuration File at the CLI

    The Cisco IOS software accepts one configuration command per line. You can enter as many configuration commands as you want. You can add comments to a configuration file describing the commands you have entered. Precede a comment with an exclamation point ( !). Because comments are not stored in NVRAM or in the active copy of the configuration file, comments do not appear when you list the active configuration with theshowrunning-configormoresystem:running-config EXEC command. Comments do not display when you list the startup configuration with the showstartup-config or morenvram:startup-config EXEC mode command. Comments are stripped out of the configuration file when it is loaded onto the router. However, you can list the comments in configuration files stored on a File Transfer Protocol (FTP), remote copy protocol (rcp), or Trivial File Transfer Protocol (TFTP) server. When you configure the software using the CLI, the software executes the commands as you enter them. To configure the software using the CLI, use the following commands beginning in privileged EXEC mode:

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    configuration command

      4.    Do one of the following:

      • end
      • ^Z

      5.    copy system:running-config nvram:startup-config


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 configuration command


      Example:
      Router(config)# configuration command
       

      Enter the necessary configuration commands. The Cisco IOS documentation set describes configuration commands organized by technology.

       
      Step 4Do one of the following:
      • end
      • ^Z


      Example:
      Router(config)# end
       

      Ends the configuration session and exits to EXEC mode.

      Note   

      When you press the Ctrl and Z keys simultaneously, ^Z is displayed to the screen.

       
      Step 5 copy system:running-config nvram:startup-config


      Example:
      Router# copy system:running-config nvram:startup-config
       

      Saves the running configuration file as the startup configuration file.

      You may also use the copyrunning-configstartup-config command alias, but you should be aware that this command is less precise. On most platforms, this command saves the configuration to NVRAM. On the Class A Flash file system platforms, this step saves the configuration to the location specified by the CONFIG_FILE environment variable (the default CONFIG_FILE variable specifies that the file should be saved to NVRAM).

       

      Examples

      In the following example, the router prompt name of the router is configured. The comment line, indicated by the exclamation mark (!), does not execute any command. The hostname command is used to change the router name from Router to new_name. By pressing Ctrl-Z (^Z) or entering the endcommand, the user quits configuration mode. The copysystem:running-confignvram:startup-config command saves the current configuration to the startup configuration.

      Router# configure terminal
      Router(config)# !The following command provides the router host name.
      Router(config)# hostname new_name
      new_name(config)# end
      new_name# copy system:running-config nvram:startup-config
      

      When the startup configuration is NVRAM, it stores the current configuration information in text format as configuration commands, recording only nondefault settings. The memory is checksummed to guard against corrupted data.


      Note


      Some specific commands might not get saved to NVRAM. You will need to enter these commands again if you reboot the machine. These commands are noted in the documentation. We recommend that you keep a list of these settings so that you can quickly reconfigure your router after rebooting.


      Copying a Configuration File from the Router to a TFTP Server

      To copy configuration information on a TFTP network server, complete the tasks in this section:

      SUMMARY STEPS

        1.    enable

        2.    copy system:running-config tftp: [[[//location ]/directory ]/filename ]

        3.    copy nvram:startup-config tftp: [[[//location ]/directory ]/filename ]


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Router> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.
         
        Step 2 copy system:running-config tftp: [[[//location ]/directory ]/filename ]


        Example:
        Router# copy system:running-config tftp: //server1/topdir/file10
         

        Copies the running configuration file to a TFTP server.

         
        Step 3 copy nvram:startup-config tftp: [[[//location ]/directory ]/filename ]


        Example:
        Router# copy nvram:startup-config tftp: //server1/1stdir/file10
         

        Copies the startup configuration file to a TFTP server.

         

        Examples

        The following example copies a configuration file from a router to a TFTP server:

        Tokyo# copy system:running-config tftp://172.16.2.155/tokyo-confg
        Write file tokyo-confg on host 172.16.2.155? [confirm] y
        Writing tokyo-confg!!! [OK]

        What to Do Next

        After you have issued the copy command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

        Copying a Configuration File from the Router to an rcp Server

        To copy a startup configuration file or a running configuration file from the router to an rcp server, use the following commands beginning in privileged EXEC mode:

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    ip rcmd remote-username username

          4.    end

          5.    Do one of the following:

          • copy system:running-config rcp: [[[//[username@]location ]/directory ]/filename ]
          • copy nvram:sta rtup-config rcp :[[[//[username@]location ]/directory ]/filename ]


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Router> enable
           

          Enables privileged EXEC mode.

          • Enter your password if prompted.
           
          Step 2 configure terminal


          Example:
          Router# configure terminal
           

          Enters global configuration mode.

           
          Step 3 ip rcmd remote-username username


          Example:
          Router(config)# ip rcmd remote-username user1
           

          (Optional) Changes the default remote username.

           
          Step 4 end


          Example:
          Router(config)# end
           

          (Optional) Exits global configuration mode.

           
          Step 5Do one of the following:
          • copy system:running-config rcp: [[[//[username@]location ]/directory ]/filename ]
          • copy nvram:sta rtup-config rcp :[[[//[username@]location ]/directory ]/filename ]


          Example:
          Router# copy system:running-config rcp: //user1@company.com/dir-files/file1
           

          Specifies that the router running configuration file be stored on an rcp server.

          or

          Specifies that the router startup configuration file be stored on an rcp server.

           

          Examples

          Storing a Running Configuration File on an rcp Server

          The following example copies the running configuration file named rtr2-confg to the netadmin1 directory on the remote host with an IP address of 172.16.101.101:

          Router# copy system:running-config rcp://netadmin1@172.16.101.101/Rtr2-confg
          Write file rtr2-confg on host 172.16.101.101?[confirm]
          Building configuration...[OK]
          Connected to 172.16.101.101
          Router#
          Storing a Startup Configuration File on an rcp Server

          The following example shows how to store a startup configuration file on a server by using rcp to copy the file:

          Rtr2# configure terminal
           
          Rtr2(config)# ip rcmd remote-username netadmin2
           
          Rtr2(config)# end
           
          Rtr2# copy nvram:startup-config rcp:
           
          Remote host[]? 172.16.101.101
           
          Name of configuration file to write [rtr2-confg]?
          Write file rtr2-confg on host 172.16.101.101?[confirm]
          ![OK]

          What to Do Next

          After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

          Copying a Configuration File from the Router to the FTP Server

          To copy a startup configuration file or a running configuration file from the router to an FTP server, complete the following tasks:

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    ip ftp username username

            4.    ip ftp password password

            5.    end

            6.    Do one of the following:

            • copy system:running-config ftp: [[[//[username [:password ]@]location/directory ]/filename ]
            • copy nvram:sta rtup-config ftp: [[[//[username [:password ]@]location/directory ]/filename ]


          DETAILED STEPS
             Command or ActionPurpose
            Step 1 enable


            Example:
            Router> enable
             

            Enables privileged EXEC mode.

            • Enter your password if prompted.
             
            Step 2 configure terminal


            Example:
            Router# configure terminal
             

            Enters global configuration mode.

             
            Step 3 ip ftp username username


            Example:
            Router(config)# ip ftp username user1
             

            (Optional) Specifies the default remote username.

             
            Step 4 ip ftp password password


            Example:
            Router(config)# ip ftp username guessme
             

            (Optional) Specifies the default password.

             
            Step 5 end


            Example:
            Router(config)# end
             

            (Optional) Exits global configuration mode. This step is required only if you override the default remote username or password (see Steps 2 and 3).

             
            Step 6Do one of the following:
            • copy system:running-config ftp: [[[//[username [:password ]@]location/directory ]/filename ]
            • copy nvram:sta rtup-config ftp: [[[//[username [:password ]@]location/directory ]/filename ]


            Example:
            Router# copy system:running-config ftp: //user1:guessme@company.com /dir10/file1
             

            Copies the running configuration or startup configuration file to an FTP server.

             

            Examples

            Storing a Running Configuration File on an FTP Server

            The following example copies the running configuration file named rtr2-confg to the netadmin1 directory on the remote host with an IP address of 172.16.101.101:

            Router# copy system:running-config ftp://netadmin1:mypass@172.16.101.101/Rtr2-confg
            Write file rtr2-confg on host 172.16.101.101?[confirm]
            Building configuration...[OK]
            Connected to 172.16.101.101
            Router#
            
            Storing a Startup Configuration File on an FTP Server

            The following example shows how to store a startup configuration file on a server by using FTP to copy the file:

            Rtr2# configure terminal
             
            Rtr2(config)# ip ftp username netadmin2
             
            Rtr2(config)# ip ftp password mypass
             
            Rtr2(config)# end
             
            Rtr2# copy nvram:startup-config ftp:
             
            Remote host[]? 172.16.101.101
             
            Name of configuration file to write [rtr2-confg]?
            Write file rtr2-confg on host 172.16.101.101?[confirm]
            ![OK]

            What to Do Next

            After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

            Copying a Configuration File from a TFTP Server to the Router

            To copy a configuration file from a TFTP server to the router, complete the tasks in this section:

            SUMMARY STEPS

              1.    enable

              2.    copy tftp: [[[//location ]/directory ]/filename ] system:running-config

              3.    copy tftp: [[[//location ]/directory ]/filename ] nvram:startup-config


            DETAILED STEPS
               Command or ActionPurpose
              Step 1 enable


              Example:
              Router> enable
               

              Enables privileged EXEC mode.

              • Enter your password if prompted.
               
              Step 2 copy tftp: [[[//location ]/directory ]/filename ] system:running-config


              Example:
              Router# copy tftp://server1/dir10/datasource system:running-config
               

              Copies a configuration file from a TFTP server to the running configuration.

               
              Step 3 copy tftp: [[[//location ]/directory ]/filename ] nvram:startup-config


              Example:
              Router# copy tftp://server1/dir10/datasource nvram:startup-config
               

              Copies a configuration file from a TFTP server to the startup configuration.

               

              Examples

              In the following example, the software is configured from the file named tokyo-config at IP address 172.16.2.155:

              Router1# copy tftp://172.16.2.155/tokyo-confg system:running-config
               
              Configure using tokyo-confg from 172.16.2.155? [confirm] y
               
              Booting tokyo-confg from 172.16.2.155:!!! [OK - 874/16000 bytes]

              What to Do Next

              After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

              Copying a Configuration File from the rcp Server to the Router

              To copy a configuration file from an rcp server to the running configuration or startup configuration, complete the following tasks:

              SUMMARY STEPS

                1.    enable

                2.    configure terminal

                3.    ip rcmd remote-username username

                4.    end

                5.    copy rcp: [[[//[username@]location ]/directory ]/filename ]system:running-config


              DETAILED STEPS
                 Command or ActionPurpose
                Step 1 enable


                Example:
                Router> enable
                 

                Enables privileged EXEC mode.

                • Enter your password if prompted.
                 
                Step 2 configure terminal


                Example:
                Router# configure terminal
                 

                (Optional) Enters configuration mode from the terminal. This step is required only if you override the default remote username (see Step 3).

                 
                Step 3 ip rcmd remote-username username


                Example:
                Router(config)# ip rcmd remote-username user1
                 

                (Optional) Specifies the remote username.

                 
                Step 4 end


                Example:
                Router(config)# end
                 

                (Optional) Exits global configuration mode. This step is required only if you override the default remote username (see Step 2).

                 
                Step 5 copy rcp: [[[//[username@]location ]/directory ]/filename ]system:running-config


                Example:
                
                
                        


                Example:
                or 


                Example:
                            
                              copy rcp:[[[//[username@]location
                ]/directory
                ]/filename
                ] nvram:startup-config


                Example:
                Router# copy rcp://[user1@company.com/dir10/fileone] nvram:s
                tartup-config
                 

                Copies the configuration file from a rcp server to the running configuration or startup configuration.

                 

                Examples

                Copy rcp Running-Config

                The following example copies a configuration file named host1-confg from the netadmin1 directory on the remote server with an IP address of 172.16.101.101, and loads and runs those commands on the router:

                Router# copy rcp://netadmin1@172.16.101.101/host1-confg system:running-config
                Configure using host1-confg from 172.16.101.101? [confirm]
                Connected to 172.16.101.101
                Loading 1112 byte file host1-confg:![OK]
                Router#
                %SYS-5-CONFIG: Configured from host1-config by rcp from 172.16.101.101
                Copy rcp Startup-Config

                The following example specifies a remote username of netadmin1. Then it copies the configuration file named host2-confg from the netadmin1 directory on the remote server with an IP address of 172.16.101.101 to the startup configuration.

                Rtr2# configure terminal
                Rtr2(config)# ip rcmd remote-username netadmin1
                Rtr2(config)# end
                Rtr2# copy rcp: nvram:startup-config
                Address of remote host [255.255.255.255]? 172.16.101.101
                Name of configuration file[rtr2-confg]? host2-confg
                Configure using host2-confg from 172.16.101.101?[confirm]
                Connected to 172.16.101.101
                Loading 1112 byte file host2-confg:![OK]
                [OK]
                Rtr2#
                %SYS-5-CONFIG_NV:Non-volatile store configured from host2-config by rcp from 172.16.101.101

                What to Do Next

                After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

                Copying a Configuration File from an FTP Server to the Router

                To copy a configuration file from an F TP server to the running configuration or startup configuration, complete the tasks in this section:

                SUMMARY STEPS

                  1.    enable

                  2.    configure terminal

                  3.    ip ftp username username

                  4.    ip ftp password password

                  5.    end

                  6.    copy ftp: [[[//[username [:password ]@]location ]/directory ]/filename ]system:running-config


                DETAILED STEPS
                   Command or ActionPurpose
                  Step 1 enable


                  Example:
                  Router> enable
                   

                  Enables privileged EXEC mode.

                  • Enter your password if prompted.
                   
                  Step 2 configure terminal


                  Example:
                  Router# configure terminal
                   

                  (Optional) Allows you to enter global configuration mode. This step is required only if you want to override the default remote username or password (see Steps 2 and 3).

                   
                  Step 3 ip ftp username username


                  Example:
                  Router(config)# ip ftp username user1
                   

                  (Optional) Specifies the default remote username.

                   
                  Step 4 ip ftp password password


                  Example:
                  Router(config)# ip ftp password guessme
                   

                  (Optional) Specifies the default password.

                   
                  Step 5 end


                  Example:
                  Router(config)# end
                   

                  (Optional) Exits global configuration mode. This step is required only if you override the default remote username or password (see Steps 2 and 3).

                   
                  Step 6 copy ftp: [[[//[username [:password ]@]location ]/directory ]/filename ]system:running-config


                  Example:



                  Example:
                  or 


                  Example:
                  copy ftp:[[[//[username
                  [:password
                  ]@]location/directory
                  ]/filename
                  ] nvram:startup-config


                  Example:
                  Router# copy ftp://user1:guessme@company.com /dir10/datasource nvram:startup-config
                   

                  Using FTP, copies the configuration file from a network server to running memory or the startup configuration.

                   

                  Examples

                  Copy FTP Running-Config

                  The following example copies a host configuration file named host1-confg from the netadmin1 directory on the remote server with an IP address of 172.16.101.101, and loads and runs those commands on the router:

                  Router# copy rcp://netadmin1:mypass@172.16.101.101/host1-confg system:running-config
                   
                  Configure using host1-confg from 172.16.101.101? [confirm]
                  Connected to 172.16.101.101
                  Loading 1112 byte file host1-confg:![OK]
                  Router#
                  %SYS-5-CONFIG: Configured from host1-config by ftp from 172.16.101.101
                  Copy FTP Startup-Config

                  The following example specifies a remote username of netadmin1. Then it copies the configuration file named host2-confg from the netadmin1 directory on the remote server with an IP address of 172.16.101.101 to the startup configuration.

                  Rtr2# configure terminal
                  Rtr2(config)# ip ftp username
                   netadmin1
                  Rtr2(config)# ip ftp password
                   mypass
                  Rtr2(config)# end
                  Rtr2# copy ftp: nvram:startup-config 
                  Address of remote host [255.255.255.255]? 172.16.101.101
                  Name of configuration file[rtr2-confg]? host2-confg
                  Configure using host2-confg from 172.16.101.101?[confirm]
                  Connected to 172.16.101.101
                  Loading 1112 byte file host2-confg:![OK]
                  [OK]
                  Rtr2#
                  %SYS-5-CONFIG_NV:Non-volatile store configured from host2-config by ftp from 172.16.101.101

                  What to Do Next

                  After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

                  Maintaining Configuration Files Larger than NVRAM

                  To maintain a configuration file that exceeds size of NVRAM, perform the tasks described in the following sections:

                  Compressing the Configuration File

                  To compress configuration files, complete the tasks in this section:

                  SUMMARY STEPS

                    1.    enable

                    2.    configure terminal

                    3.    service compress-config

                    4.    end

                    5.    Do one of the following:

                    • Use FTP, rcp, or TFTP to copy the new configuration.
                    • configure terminal

                    6.    copy system:running-config nvram:startup-config


                  DETAILED STEPS
                     Command or ActionPurpose
                    Step 1 enable


                    Example:
                    Router> enable
                     

                    Enables privileged EXEC mode.

                    • Enter your password if prompted.
                     
                    Step 2 configure terminal


                    Example:
                    Router# configure terminal
                     

                    Enters global configuration mode.

                     
                    Step 3 service compress-config


                    Example:
                    Router(config)# service compress-config
                     

                    Specifies that the configuration file be compressed.

                     
                    Step 4 end


                    Example:
                    Router(config)# end
                     

                    Exits global configuration mode.

                     
                    Step 5Do one of the following:
                    • Use FTP, rcp, or TFTP to copy the new configuration.
                    • configure terminal


                    Example:
                    Router# configure terminal
                     

                    Enters the new configuration:

                    • If you try to load a configuration that is more than three times larger than the NVRAM size, the following error message is displayed:

                    “[buffer overflow - file-size /buffer-size bytes].”

                     
                    Step 6 copy system:running-config nvram:startup-config


                    Example:
                    Router(config)# copy system:running-config nvram:startup-config
                     

                    When you have finished changing the running-configuration, saves the new configuration.

                     
                    Examples

                    The following example compresses a 129-KB configuration file to 11 KB:

                    Router# configure terminal
                     
                    Router(config)# service compress-config
                     
                    Router(config)# end
                     
                    Router# copy tftp://172.16.2.15/tokyo-confg system:running-config
                     
                    Configure using tokyo-confg from 172.16.2.155? [confirm] y
                     
                    Booting tokyo-confg from 172.16.2.155:!!! [OK - 874/16000 bytes]
                    Router# copy system:running-config nvram:startup-config
                     
                    Building configuration...
                    Compressing configuration from 129648 bytes to 11077 bytes
                    [OK]
                    

                    Storing the Configuration in Flash Memory on Class A Flash File Systems

                    To store the startup configuration in Flash memory, complete the tasks in this section:

                    SUMMARY STEPS

                      1.    enable

                      2.    copy nvram:startup-config flash-filesystem:filename

                      3.    configure terminal

                      4.    boot config flash-filesystem: filename

                      5.    end

                      6.    Do one of the following:

                      • Use FTP, rcp, or TFTP to copy the new configuration. If you try to load a configuration that is more than three times larger than the NVRAM size, the following error message is displayed:
                      • “[buffer overflow - file-size /buffer-size bytes] . ”
                      • configure terminal

                      7.    copy system:running-config nvram:startup-config


                    DETAILED STEPS
                       Command or ActionPurpose
                      Step 1 enable


                      Example:
                      Router> enable
                       

                      Enables privileged EXEC mode.

                      • Enter your password if prompted.
                       
                      Step 2 copy nvram:startup-config flash-filesystem:filename


                      Example:
                      Router# copy nvram:startup-config slot0:router-config
                       

                      Copies the current startup configuration to the new location to create the configuration file.

                       
                      Step 3 configure terminal


                      Example:
                      Router# configure terminal
                       

                      Enters global configuration mode.

                       
                      Step 4 boot config flash-filesystem: filename


                      Example:
                      Router(config)# boot config slot0:router-config 
                       

                      Specifies that the startup configuration file be stored in Flash memory by setting the CONFIG_FILE variable.

                       
                      Step 5 end


                      Example:
                      Router(config)# end
                       

                      Exits global configuration mode.

                       
                      Step 6Do one of the following:
                      • Use FTP, rcp, or TFTP to copy the new configuration. If you try to load a configuration that is more than three times larger than the NVRAM size, the following error message is displayed:
                      • “[buffer overflow - file-size /buffer-size bytes] . ”
                      • configure terminal


                      Example:
                      Router# configure terminal
                       

                      Enters the new configuration.

                       
                      Step 7 copy system:running-config nvram:startup-config


                      Example:
                      Router(config)# copy system:running-config nvram:startup-config
                       

                      When you have finished changing the running-configuration, saves the new configuration.

                       
                      Examples

                      The following example stores the configuration file in slot 0:

                      Router# copy nvram:startup-config slot0:router-config
                       
                      Router# configure terminal
                       
                      Router(config)# boot config slot0:router-config
                       
                      Router(config)# end
                       
                      Router# copy system:running-config nvram:startup-config
                      

                      Loading the Configuration Commands from the Network

                      To use a network server to store large configura tions, complete the tasks in this section:

                      SUMMARY STEPS

                        1.    enable

                        2.    copy system:running-config {ftp: | rcp: |tftp:}

                        3.    configure terminal

                        4.    boot network {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ]}

                        5.    service config

                        6.    end

                        7.    copy system:running-config nvram:startup-config


                      DETAILED STEPS
                         Command or ActionPurpose
                        Step 1 enable


                        Example:
                        Router> enable
                         

                        Enables privileged EXEC mode.

                        • Enter your password if prompted.
                         
                        Step 2 copy system:running-config {ftp: | rcp: |tftp:}


                        Example:
                        Router# copy system:running-config ftp:
                         

                        Saves the running configuration to an FTP, rcp, or TFTP server.

                         
                        Step 3 configure terminal


                        Example:
                        Router# configure terminal
                         

                        Enters global configuration mode.

                         
                        Step 4 boot network {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ]}


                        Example:
                        Router(config)# boot network ftp://user1:guessme@company.com/dir10/file1
                         

                        Specifies that the startup configuration file be loaded from the network server at startup.

                         
                        Step 5 service config


                        Example:
                        Router(config)# service config
                         

                        Enables the router to download configuration files at system startup.

                         
                        Step 6 end


                        Example:
                        Router(config)# end
                         

                        Exits global configuration mode.

                         
                        Step 7 copy system:running-config nvram:startup-config


                        Example:
                        Router# copy system:running-config nvram:startup-config
                         

                        Saves the configuration.

                         

                        Copying Configuration Files from Flash Memory to the Startup or Running Configuration

                        To copy a configuration file from Flash memory directly to your startup configuration in NVRAM or your running configuration, enter one of the commands in Step 2:

                        SUMMARY STEPS

                          1.    enable

                          2.    Do one of the following:

                          • copy filesystem : [partition-number:][filename ] nvram:startup-config
                          • copy filesystem : [partition-number:][filename ] system:running-config


                        DETAILED STEPS
                           Command or ActionPurpose
                          Step 1 enable


                          Example:
                          Router> enable
                           

                          Enables privileged EXEC mode.

                          • Enter your password if prompted.
                           
                          Step 2Do one of the following:
                          • copy filesystem : [partition-number:][filename ] nvram:startup-config
                          • copy filesystem : [partition-number:][filename ] system:running-config


                          Example:
                          Router# copy slot0:4:ios-upgrade-1 nvram:startup-config
                           

                          Loads a configuration file directly into NVRAM.

                          or

                          Copies a configuration file to your running configuration.

                           

                          Examples

                          The following example copies the file named ios-upgrade-1 from partition 4 of the Flash memory PC Card in slot 0 to the router startup configurations:

                          Router# copy slot0:4:ios-upgrade-1 nvram:startup-config
                           
                          Copy '
                          ios-upgrade-1
                          ' from flash device
                            as 'startup-config' ? [yes/no] yes
                           
                          [OK]

                          Copying Configuration Files Between Flash Memory File Systems

                          On platforms with multiple Flash memory file systems, you can copy files from one Flash memory file system, such as internal Flash memory or a Flash memory card in a PCMCIA slot, to another Flash memory file system. Copying files to different Flash memory file systems lets you create backup copies of working configurations and duplicate configurations for other routers. To copy a configuration file between Flash memory file systems, use the following commands in EXEC mode:

                          SUMMARY STEPS

                            1.    enable

                            2.    show source-filesystem :

                            3.    copy source-filesystem : [partition-number:][filename ] dest-filesystem:[partition-number:][filename ]

                            4.    verify dest-filesystem : [partition-number:][filename ]


                          DETAILED STEPS
                             Command or ActionPurpose
                            Step 1 enable


                            Example:
                            Router> enable
                             

                            Enables privileged EXEC mode.

                            • Enter your password if prompted.
                             
                            Step 2 show source-filesystem :


                            Example:
                            Router# copy slot0:4:ios-upgrade-1 nvram:startup-config
                             

                            Displays the layout and contents of Flash memory to verify the filename.

                             
                            Step 3 copy source-filesystem : [partition-number:][filename ] dest-filesystem:[partition-number:][filename ]


                            Example:
                            Router# copy flash: slot1: 
                             

                            Copies a configuration file between Flash memory devices.

                            • The source device and the destination device cannot be the same. For example, the copyslot1:slot1: command is invalid.
                             
                            Step 4 verify dest-filesystem : [partition-number:][filename ]


                            Example:
                            Router# verify flash: slot1:
                             

                            Verifies the checksum of the file you copied.

                             

                            Example

                            The following example copies the file named running-config from partition 1 of internal Flash memory to partition 1 of slot 1 on a Cisco 3600 series router. In this example, the source partition is not specified, so the router prompts for the partition number.

                            Router# copy flash: slot1:
                             
                            System flash
                            Partition   Size    Used      Free      Bank-Size  State          Copy Mode
                              1         4096K   3070K     1025K     4096K      Read/Write     Direct
                              2        16384K   1671K    14712K     8192K      Read/Write     Direct
                            [Type ?<no> for partition directory; ? for full directory; q to abort]
                            Which partition? [default = 1] 
                            System flash directory, partition 1:
                            File  Length   Name/status
                              1   3142748  dirt/network/mars-test/c3600-j-mz.latest  
                              2   850      running-config  
                            [3143728 bytes used, 1050576 available, 4194304 total]
                            PCMCIA Slot1 flash directory:
                            File  Length   Name/status
                              1   1711088  dirt/gate/c3600-i-mz 
                              2   850      running-config 
                            [1712068 bytes used, 2482236 available, 4194304 total]
                            Source file name? running-config
                             
                            Destination file name [running-config]? 
                            Verifying checksum for 'running-config' (file # 2)...  OK
                            Erase flash device before writing? [confirm]
                            Flash contains files. Are you sure you want to erase? [confirm]
                            Copy 'running-config' from flash: device
                              as 'running-config' into slot1: device WITH erase? [yes/no] yes
                             
                            Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
                            !
                             [OK - 850/4194304 bytes]
                            Flash device copy took 00:00:30 [hh:mm:ss]
                            Verifying checksum...  OK (0x16)

                            Copying a Configuration File from an FTP Server to Flash Memory Devices

                            To copy a configuration file from an FTP server to a Flash memory device, complete the task in this section:

                            SUMMARY STEPS

                              1.    enable

                              2.    configure terminal

                              3.    ip ftp username username

                              4.    ip ftp password password

                              5.    end

                              6.    copy ftp: [[[//[username:password@]location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                            DETAILED STEPS
                               Command or ActionPurpose
                              Step 1 enable


                              Example:
                              Router> enable
                               

                              Enables privileged EXEC mode.

                              • Enter your password if prompted.
                               
                              Step 2 configure terminal


                              Example:
                              Router# configure terminal
                               

                              (Optional) Enters global configuration mode. This step is required only if you override the default remote username or password (see Steps 3 and 4).

                               
                              Step 3 ip ftp username username


                              Example:
                              Router(config)# ip ftp username user1
                               

                              (Optional) Specifies the remote username.

                               
                              Step 4 ip ftp password password


                              Example:
                              Router(config)# ip ftp password guessme
                               

                              (Optional) Specifies the remote password.

                               
                              Step 5 end


                              Example:
                              Router(config)# end
                               

                              (Optional) Exits configuration mode. This step is required only if you override the default remote username (see Steps 3 and 4).

                               
                              Step 6 copy ftp: [[[//[username:password@]location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                              Example:
                              Router> copy ftp:router-config slot0:new-config
                               

                              Copies the configuration file from a network server to the Flash memory device using FTP.

                               

                              What to Do Next

                              After you have issued the copy EXEC command, you may be prompted for additional information or for confirmation of the action. The prompting will depend on how much information you provide in the copy command and the current setting of the fileprompt global configuration command.

                              Copying a Configuration File from an rcp Server to Flash Memory Devices

                              To copy a configuration file from an rcp server to a Flash memory device, complete the tasks in this section:

                              SUMMARY STEPS

                                1.    enable

                                2.    configure terminal

                                3.    ip rcmd remote-username username

                                4.    end

                                5.    copy rcp: [[[//[username@]location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                              DETAILED STEPS
                                 Command or ActionPurpose
                                Step 1 enable


                                Example:
                                Router> enable
                                 

                                Enables privileged EXEC mode.

                                • Enter your password if prompted.
                                 
                                Step 2 configure terminal


                                Example:
                                Router# configure terminal
                                 

                                (Optional) Enters global configuration mode.This step is required only if you override the default remote username or password (see Steps 3 and 4).

                                 
                                Step 3 ip rcmd remote-username username


                                Example:
                                Router(config)# ip rcmd remote-username user1
                                 

                                (Optional) Specifies the remote username.

                                 
                                Step 4 end


                                Example:
                                Router(config)# end
                                 

                                (Optional) Exits configuration mode.This step is required only if you override the default remote username or password (see Steps 3 and 4).

                                 
                                Step 5 copy rcp: [[[//[username@]location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                                Example:
                                Router# copy rcp:router-config slot0:new-config
                                 

                                Copies the configuration file from a network server to the Flash memory device using rcp. Reply to any router prompts for additional information or confirmation. The prompting will depending on how much information you provide in the copy command and the current setting of the fileprompt command.

                                 

                                Copying a Configuration File from a TFTP Server to Flash Memory Devices

                                To copy a configuration file from a TFTP server to a Flash memory device, complete the task in this section:

                                SUMMARY STEPS

                                  1.    enable

                                  2.    copy tftp: [[[//location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                                DETAILED STEPS
                                   Command or ActionPurpose
                                  Step 1 enable


                                  Example:
                                  Router> enable
                                   

                                  Enables privileged EXEC mode.

                                  • Enter your password if prompted.
                                   
                                  Step 2 copy tftp: [[[//location ]/directory ]/filename ] flash-filesystem:[partition-number:][filename ]


                                  Example:
                                  Router# copy tftp:router-config slot0:new-config
                                   

                                  Copies the file from a TFTP server to the Flash memory device. Reply to any router prompts for additional information or confirmation. The prompting will depending on how much information you provide in the copy command and the current setting of the fileprompt command.

                                   

                                  Examples

                                  The following example shows the copying of the configuration file named router-config from a TFTP server to the Flash memory card inserted in slot 0 of the Network Processing Engine (NPE) or Route Switch Processor (RSP) card of a Cisco 7500 series router. The copied file is renamed new-config.

                                  Router# copy tftp:router-config slot0:new-config
                                  

                                  Reexecuting the Configuration Commands in the Startup Configuration File

                                  To reexecute the commands located in the startup configuration file, complete the task in this section:

                                  SUMMARY STEPS

                                    1.    enable

                                    2.    configure memory


                                  DETAILED STEPS
                                     Command or ActionPurpose
                                    Step 1 enable


                                    Example:
                                    Router> enable
                                     

                                    Enables privileged EXEC mode.

                                    • Enter your password if prompted.
                                     
                                    Step 2 configure memory


                                    Example:
                                    Router# configure memory
                                     

                                    Reexecutes the configuration commands located in the startup configuration file .

                                     

                                    Clearing the Startup Configuration

                                    You can clear the configuration information from the startup configuration. If you reboot the router with no startup configuration, the router will enter the Setup command facility so that you can configure the router from scratch.To clear the contents of your startup configuration, complete the task in this section:

                                    SUMMARY STEPS

                                      1.    enable

                                      2.    erase nvram


                                    DETAILED STEPS
                                       Command or ActionPurpose
                                      Step 1 enable


                                      Example:
                                      Router> enable
                                       

                                      Enables privileged EXEC mode.

                                      • Enter your password if prompted.
                                       
                                      Step 2 erase nvram


                                      Example:
                                      Router# erase nvram
                                       

                                      Clears the contents of your startup configuration.

                                      Note   

                                      For all platforms except the Class A Flash file system platforms, this command erases NVRAM. The startup configuration file cannot be restored once it has been deleted. On Class A Flash file system platforms, when you use the erasestartup-configEXECcommand, the router erases or deletes the configuration pointed to by CONFIG_FILE environment variable. If this variable points to NVRAM, the router erases NVRAM. If the CONFIG_FILE environment variable specifies a Flash memory device and configuration filename, the router deletes the configuration file. That is, the router marks the file as “deleted,” rather than erasing it. This feature allows you to recover a deleted file.

                                       

                                      Deleting a Specified Configuration File

                                      To delete a specifi ed configuration on a specific Flash device, complete the task in this section:

                                      SUMMARY STEPS

                                        1.    enable

                                        2.    delete flash-filesystem : filename


                                      DETAILED STEPS
                                         Command or ActionPurpose
                                        Step 1 enable


                                        Example:
                                        Router> enable
                                         

                                        Enables privileged EXEC mode.

                                        • Enter your password if prompted.
                                         
                                        Step 2 delete flash-filesystem : filename


                                        Example:
                                        Router# delete slot0:myconfig
                                         

                                        Deletes a specified configuration file on a specified Flash device.

                                        Note   

                                        On Class A and B Flash file systems, when you delete a specific file in Flash memory, the system marks the file as deleted, allowing you to later recover a deleted file using the undelete EXEC command. Erased files cannot be recovered. To permanently erase the configuration file, use the squeeze EXEC command. On Class C Flash file systems, you cannot recover a file that has been deleted. If you attempt to erase or delete the configuration file specified by the CONFIG_FILE environment variable, the system prompts you to confirm the deletion.

                                         

                                        Specifying the CONFIG_FILE Environment Variable on Class A Flash File Systems

                                        On Class A Flash file systems, you can configure the Cisco IOS software to load the startup configuration file specified by the CONFIG_FILE environment variable. The CONFIG_FILE variable defaults to NVRAM. To change the CONFIG_FILE environment variable, complete the tasks in this section:

                                        SUMMARY STEPS

                                          1.    enable

                                          2.    copy [flash-url| ftp-url | rcp-url| tftp-url | system:running-config | nvram:startup-config] dest-flash-url

                                          3.    configure terminal

                                          4.    boot config dest-flash-url

                                          5.    end

                                          6.    copy system:running-config nvram:startup-config

                                          7.    show bootvar


                                        DETAILED STEPS
                                           Command or ActionPurpose
                                          Step 1 enable

                                          Example:
                                          enable
                                           

                                          Enables privileged EXEC mode.

                                          • Enter your password if prompted.
                                           
                                          Step 2 copy [flash-url| ftp-url | rcp-url| tftp-url | system:running-config | nvram:startup-config] dest-flash-url


                                          Example:
                                          Router# copy system:running-config nvram:startup-config
                                           

                                          Copies the configuration file to the Flash file system from which the router will load the file upon restart.

                                           
                                          Step 3 configure terminal


                                          Example:
                                          Router# configure terminal
                                           

                                          Enters global configuration mode.

                                           
                                          Step 4 boot config dest-flash-url


                                          Example:
                                          Router(config)# boot config 172.16.1.1
                                           

                                          Sets the CONFIG_FILE environment variable. This step modifies the runtime CONFIG_FILE environment variable.

                                           
                                          Step 5 end


                                          Example:
                                          Router(config)# end
                                           

                                          Exits global configuration mode.

                                           
                                          Step 6 copy system:running-config nvram:startup-config


                                          Example:
                                          Router# copy system:running-config nvram:startup-config
                                           

                                          Saves the configuration performed in Step 3 to the startup configuration.

                                           
                                          Step 7 show bootvar


                                          Example:
                                          Router# show bootvar
                                           

                                          (Optional) Allows you to verify the contents of the CONFIG_FILE environment variable.

                                           

                                          Examples

                                          The following example copies the running configuration file to the first PCMCIA slot of the RSP card in a Cisco 7500 series router. This configuration is then used as the startup configuration when the system is restarted.

                                          Router# copy system:running-config slot0:config2
                                          Router# configure terminal
                                          Router(config)# boot config slot0:config2
                                          Router(config)# end
                                          Router# copy system:running-config nvram:startup-config
                                          [ok]
                                          Router# show bootvar
                                          BOOT variable = slot0:rsp-boot-m
                                          CONFIG_FILE variable = nvram:
                                          Current CONFIG_FILE variable = slot0:config2
                                          Configuration register is 0x010F
                                          

                                          What to Do Next

                                          After you specify a location for the startup configuration file, the nvram:startup-config command is aliased to the new location of the startup configuration file. The morenvram:startup-config EXEC command will display the startup configuration, regardless of its location. The erasenvram:startup-config EXEC command will erase the contents of NVRAM and delete the file pointed to by the CONFIG_FILE environment variable.

                                          When you save the configuration using the copysystem:running-confignvram:startup-config command, the router saves a complete version of the configuration file to the location specified by the CONFIG_FILE environment variable and a distilled version to NVRAM. A distilled version is one that does not contain access list information. If NVRAM contains a complete configuration file, the router prompts you to confirm your overwrite of the complete version with the distilled version. If NVRAM contains a distilled configuration, the router does not prompt you for confirmation and proceeds with overwriting the existing distilled configuration file in NVRAM.


                                          Note


                                          If you specify a file in a Flash device as the CONFIG_FILE environment variable, every time you save your configuration file with the copysystem:running-confignvram:startup-config command, the old configuration file is marked as “deleted,” and the new configuration file is saved to that device. Eventually, Flash memory will be full, because the old configuration files still take up memory. Use the squeeze EXEC command to permanently delete the old configuration files and reclaim the space.


                                          Configuring the Router to Download Configuration Files

                                          You can specify an ordered list of network configuration and host configuration filenames. The Cisco IOS XE software scans this list until it loads the appropriate network or host configuration file.

                                          To configure the router to download configuration files at system startup, perform at least one of the tasks described in the following sections:

                                          • "Configuring the Router to Download the Network Configuration File"
                                          • "Configuring the Router to Download the Host Configuration File"

                                          If the router fails to load a configuration file during startup, it tries again every 10 minutes (the default setting) until a host provides the requested files. With each failed attempt, the router displays the following message on the console terminal:

                                          Booting host-confg... [timed out]
                                          

                                          If there are any problems with the startup configuration file, or if the configuration register is set to ignore NVRAM, the router enters the Setup command facility.

                                          Configuring the Router to Download the Network Configuration File

                                          To configure the Cisco IOS software to download a network configuration file from a server at startup, complete the tasks in this section:

                                          SUMMARY STEPS

                                            1.    enable

                                            2.    configure terminal

                                            3.    boot network {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ]}

                                            4.    service config

                                            5.    end

                                            6.    Router#copysystem:running-confignvram:startup-config


                                          DETAILED STEPS
                                             Command or ActionPurpose
                                            Step 1 enable


                                            Example:
                                            Router> enable
                                             

                                            Enables privileged EXEC mode.

                                            • Enter your password if prompted.
                                             
                                            Step 2 configure terminal


                                            Example:
                                            Router# configure terminal
                                             

                                            Enters global configuration mode.

                                             
                                            Step 3 boot network {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ]}


                                            Example:
                                            Router(config)# boot network tftp:hostfile1
                                             

                                            Specifies the network configuration file to download at startup, and the protocol to be used (TFTP, rcp, or FTP).

                                            • If you do not specify a network configuration filename, the Cisco IOS software uses the default filename network-confg. If you omit the address, the router uses the broadcast address.
                                            • You can specify more than one network configuration file. The software tries them in order entered until it loads one. This procedure can be useful for keeping files with different configuration information loaded on a network server.
                                             
                                            Step 4 service config


                                            Example:
                                            Router(config)# service config
                                             

                                            Enables the system to automatically load the network file upon restart.

                                             
                                            Step 5 end


                                            Example:
                                            Router(config)# end
                                             

                                            Exits global configuration mode.

                                             
                                            Step 6 Router#copysystem:running-confignvram:startup-config

                                            Example:
                                            Router# copy system:running-config nvram:startup-config
                                             

                                            Saves the running configuration to the startup configuration file.

                                             

                                            Configuring the Router to Download the Host Configuration File

                                            To configure the Cisco IOS software to download a host configuration file from a server at startup, complete the tasks in this section:

                                            SUMMARY STEPS

                                              1.    enable

                                              2.    configure terminal

                                              3.    boot host {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ] }

                                              4.    service config

                                              5.    end

                                              6.    copy system:running-config nvram:startup-config


                                            DETAILED STEPS
                                               Command or ActionPurpose
                                              Step 1 enable


                                              Example:
                                              Router> enable
                                               

                                              Enables privileged EXEC mode.

                                              • Enter your password if prompted.
                                               
                                              Step 2 configure terminal


                                              Example:
                                              Router# configure terminal
                                               

                                              Enters global configuration mode.

                                               
                                              Step 3 boot host {ftp:[[[//[username [:password ]@]location ]/directory ]/filename ] | rcp:[[[//[username@]location ]/directory ]/filename ] | tftp:[[[//location ]/directory ]/filename ] }


                                              Example:
                                              Router(config)# boot host tftp:hostfile1
                                               

                                              Specifies the host configuration file to download at startup, and the protocol to be used (FTP, rcp, or TFTP):

                                              • If you do not specify a host configuration filename, the router uses its own name to form a host configuration filename by converting the name to all lowercase letters, removing all domain information, and appending “-confg.” If no host name information is available, the software uses the default host configuration filename router-confg. If you omit the address, the router uses the broadcast address.
                                              • You can specify more than one host configuration file. The Cisco IOS software tries them in order entered until it loads one. This procedure can be useful for keeping files with different configuration information loaded on a network server.
                                               
                                              Step 4 service config


                                              Example:
                                              Router(config)# service config
                                               

                                              Enables the system to automatically load the host file upon restart.

                                               
                                              Step 5 end


                                              Example:
                                              Router(config)# end
                                               

                                              Exits global configuration mode.

                                               
                                              Step 6 copy system:running-config nvram:startup-config


                                              Example:
                                              Router# copy system:running-config nvram:startup-config
                                               

                                              Saves the running configuration to the startup configuration file.

                                               
                                              Examples

                                              In the following example, a router is configured to download the host configuration file named hostfile1 and the network configuration file named networkfile1. The router uses TFTP and the broadcast address to obtain the file.

                                              Router# configure terminal
                                              Router(config)# boot host tftp:hostfile1
                                              Router(config)# boot network tftp:networkfile1
                                              Router(config)# service config
                                              Router(config)# end
                                              Router# copy system:running-config nvram:startup-config
                                              

                                              Additional References

                                              Related Documents

                                              Related Topic

                                              Document Title

                                              Cisco IOS commands

                                              Cisco IOS Master Commands List, All Releases

                                              Cisco IOS configuration commands

                                              Cisco IOS Configuration Fundamentals Command Reference

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