Working with Configuration Files

This chapter contains the following sections:

Information About Configuration Files

Configuration files contain the Cisco NX-OS software commands used to configure the features on a Cisco NX-OS device. Commands are parsed (translated and executed) by the Cisco NX-OS software when the system is booted (from the startup-config file) or when you enter commands at the CLI in a configuration mode.

To change the startup configuration file, you can either save the running-configuration file to the startup configuration using the copy running-config startup-config command or copy a configuration file from a file server to the startup configuration.

Types of Configuration Files

The Cisco NX-OS software has two types of configuration files, running configuration and startup configuration. The device uses the startup configuration (startup-config) during device startup to configure the software features. The running configuration (running-config) contains the current changes that you make to the startup-configuration file. The two configuration files can be different. You may want to change the device configuration for a short time period rather than permanently. In this case, you would change the running configuration by using commands in global configuration mode but not save the changes to the startup configuration.

To change the running configuration, use the configure terminal command to enter global configuration mode. As you use the Cisco NX-OS 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 or download a configuration file from a file server to the startup configuration.

Licensing Requirements for Configuration Files

The following table shows the licensing requirements for this feature:

Product

License Requirement

Cisco NX-OS

Configuration files require no license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.

Managing Configuration Files

This section describes how to manage configuration files.

Saving the Running Configuration to the Startup Configuration

You can save the running configuration to the startup configuration to save your changes for the next time you that reload the device.

Procedure
      Command or Action Purpose
    Step 1 show running-config


    Example: 
    switch# show running-config
          		(Optional)

    Displays the running configuration.

     
    Step 2 copy running-config startup-config


    Example: 
    switch# copy running-config startup-config
     

    Copies the running configuration to the startup configuration.

     

    Copying a Configuration File to a Remote Server

    You can copy a configuration file stored in the internal memory to a remote server as a backup or to use for configuring other Cisco NX-OS devices.

    Procedure
        Command or Action Purpose
      Step 1 copy running-config scheme://server/[url /]filename


      Example: 
      switch# copy running-config 
tftp://10.10.1.1/sw1-run-config.bak
       

      Copies the running-configuration file to a remote server.

      For the scheme argument, you can enter tftp:, ftp:, scp:, or sftp:. The server argument is the address or name of the remote server, and the url argument is the path to the source file on the remote server.

      The server, url, and filename arguments are case sensitive.

       
      Step 2 copy startup-config scheme://server/[url /]filename


      Example: 
      switch# copy startup-config 
tftp://10.10.1.1/sw1-start-config.bak
       

      Copies the startup-configuration file to a remote server.

      For the scheme argument, you can enter tftp:, ftp:, scp:, or sftp:. The server argument is the address or name of the remote server, and the url argument is the path to the source file on the remote server.

      The server, url, and filename arguments are case sensitive.

       

      Downloading the Running Configuration From a Remote Server

      You can configure your Cisco NX-OS device by using configuration files that you created on another Cisco NX-OS device and uploaded to a remote server. You then download the file from the remote server to your device using TFTP, FTP, Secure Copy (SCP), or Secure Shell FTP (SFTP) to the running configuration.

      Before You Begin

      Ensure that the configuration file that you want to download is in the correct directory on the remote server.

      Ensure that the permissions on the file are set correctly. Permissions on the file should be set to world-read.

      Ensure that your Cisco NX-OS device has a route to the remote server. The Cisco NX-OS device and the remote server must be in the same subnetwork if you do not have a router or a default gateway to route traffic between subnets.

      Check connectivity to the remote server using the ping or ping6 command.

      Procedure
          Command or Action Purpose
        Step 1 copy scheme://server/[url/]filename running-config


        Example: 
        switch# copy tftp://10.10.1.1/my-config 
running-config
         

        Downloads the running-configuration file from a remote server.

        For the scheme argument, you can enter tftp:, ftp:, scp:, or sftp:. The server argument is the address or name of the remote server, and the url argument is the path to the source file on the remote server.

        The server, url, and filename arguments are case sensitive.

         
        Step 2 show running-config


        Example: 
        switch# show running-config
                  		(Optional)

        Displays the running configuration.

         
        Step 3 copy running-config startup-config


        Example: 
        switch# copy running-config startup-config
                  		(Optional)

        Copies the running configuration to the startup configuration.

         
        Step 4 show startup-config


        Example: 
        switch# show startup-config
                  		(Optional)

        Displays the startup configuration.

         

        Downloading the Startup Configuration From a Remote Server

        You can configure your Cisco NX-OS device by using configuration files that you created on another Cisco NX-OS device and uploaded to a remote server. You then download the file from the remote server to your device using TFTP, FTP, Secure Copy (SCP), or Secure Shell FTP (SFTP) to the startup configuration.


        Caution

        This procedure disrupts all traffic on the Cisco NX-OS device.
        Before You Begin

        Log in to a session on the console port.

        Ensure that the configuration file that you want to download is in the correct directory on the remote server.

        Ensure that the permissions on the file are set correctly. Permissions on the file should be set to world-read.

        Ensure that your Cisco NX-OS device has a route to the remote server. The Cisco NX-OS device and the remote server must be in the same subnetwork if you do not have a router or a default gateway to route traffic between subnets.

        Check connectivity to the remote server using the ping or ping6 command.

        Procedure
            Command or Action Purpose
          Step 1 write erase


          Example:
          switch# write erase
           

          Erases the startup configuration file.

           
          Step 2 reload


          Example:
          switch# reload
This command will reboot the system. (y/n)?  [n] y
...
Enter the password for "admin": <password>
Confirm the password for "admin": <password>
...
Would you like to enter the basic configuration 
dialog (yes/no): n
switch#
           

          Reloads the Cisco NX-OS device.

          Note   

          Do not use the setup utility to configure the device.
           
          Step 3 copy scheme://server/[url /]filename running-config


          Example: 
          switch# copy tftp://10.10.1.1/my-config 
running-config
           

          Downloads the running configuration file from a remote server.

          For the scheme argument, you can enter tftp:, ftp:, scp:, or sftp:. The server argument is the address or name of the remote server, and the url argument is the path to the source file on the remote server.

          The server, url, and filename arguments are case sensitive.

           
          Step 4 copy running-config startup-config


          Example:
          switch# copy running-config 
startup-config
           

          Saves the running configuration file to the startup configuration file.

           
          Step 5 show startup-config


          Example: 
          switch# show startup-config
                      		(Optional)

          Displays the running configuration.

           

          Copying Configuration Files to an External Flash Memory Device

          You can copy configuration files to an external flash memory device as a backup for later use.

          Before You Begin

          Insert the external Flash memory device into the active supervisor module.

          Procedure
              Command or Action Purpose
            Step 1 dir {slot0: | usb1: | usb2:}[directory/]
                          		(Optional)

            Displays the files on the external flash memory device.

             
            Step 2 copy running-config {slot0: | usb1: | usb2:}[directory/]filename


            Example: 
            switch# copy running-config slot0:dsn-running-config.cfg
             

            Copies the running configuration to an external flash memory device. The filename argument is case sensitive.

             
            Step 3 copy startup-config {slot0: | usb1: | usb2:}[directory/]filename


            Example: 
            switch# copy startup-config slot0:dsn-startup-config.cfg
             

            Copies the startup configuration to an external flash memory device. The filename argument is case sensitive.

             

            Copying the Running Configuration From an External Flash Memory Device

            You can configure your Cisco NX-OS device by copying configuration files created on another Cisco NX-OS device and saved to an external flash memory device.

            Before You Begin

            Insert the external flash memory device into the active supervisor module.

            Procedure
                Command or Action Purpose
              Step 1 dir {slot0: | usb1: | usb2:}[directory/]


              Example: 
              switch# dir slot0:
                              		(Optional)

              Displays the files on the external flash memory device.

               
              Step 2 copy {slot0: | usb1: | usb2:}[directory/]filename running-config


              Example: 
              switch# copy slot0:dsn-config.cfg running-config
               

              Copies the running configuration from an external flash memory device. The filename argument is case sensitive.

               
              Step 3 show running-config


              Example: 
              switch# show running-config
                              		(Optional)

              Displays the running configuration.

               
              Step 4 copy running-config startup-config


              Example: 
              switch# copy running-config startup-config
                              		(Optional)

              Copies the running configuration to the startup configuration.

               
              Step 5 show startup-config


              Example: 
              switch# show startup-config
                              		(Optional)

              Displays the startup configuration.

               

              Copying the Startup Configuration From an External Flash Memory Device

              You can recover the startup configuration on your Cisco NX-OS device by downloading a new startup configuration file saved on an external flash memory device.

              Before You Begin

              Insert the external flash memory device into the active supervisor module.

              Procedure
                  Command or Action Purpose
                Step 1 dir {slot0: | usb1: | usb2:}[directory/]
                                  		(Optional)

                Displays the files on the external flash memory device.

                 
                Step 2 copy {slot0: | usb1: | usb2:}[directory /]filename startup-config


                Example: 
                switch# copy slot0:dsn-config.cfg startup-config
                 

                Copies the startup configuration from an external flash memory device. The filename argument is case sensitive.

                 
                Step 3 show startup-config


                Example: 
                switch# show startup-config
                                  		(Optional)

                Displays the startup configuration.

                 

                Copying Configuration Files to an Internal File System

                You can copy configuration files to the internal memory as a backup for later use.

                Procedure
                    Command or Action Purpose
                  Step 1 copy running-config [filesystem:][directory/] | [directory/]filename


                  Example: 
                  switch# copy running-config bootflash:sw1-run-config.bak
                   

                  Copies the running-configuration file to internal memory.

                  The filesystem, directory, and filename arguments are case sensitive.

                   
                  Step 2 copy startup-config [filesystem:][directory/] | [directory/]filename


                  Example: 
                  switch# copy startup-config bootflash:sw1-start-config.bak
                   

                  Copies the startup-configuration file to internal memory.

                  The filesystem, directory, and filename arguments are case sensitive.

                   

                  Rolling Back to a Previous Configuration

                  Problems, such as memory corruption, can occur that make it necessary for you to recover your configuration from a backed up version.


                  Note

                  Each time that you enter a copy running-config startup-config command, a binary file is created and the ASCII file is updated. A valid binary configuration file reduces the overall boot time significantly. A binary file cannot be uploaded, but its contents can be used to overwrite the existing startup configuration. The write erase command clears the binary file.
                  Procedure
                      Command or Action Purpose
                    Step 1 write erase


                    Example:
                    switch# write erase
                     

                    Clears the current configuration of the switch.

                     
                    Step 2 reload


                    Example:
                    switch# reload
                     

                    Restarts the device. You will be prompted to provide a kickstart and system image file for the device to boot and run.

                     
                    Step 3 copy configuration_file running-configuration


                    Example: 
                    switch# copy bootflash:start-config.bak running-configuration
                     

                    Copies a previously saved configuration file to the running configuration.

                    Note   

                    The configuration_file filename argument is case-sensitive.
                     
                    Step 4 copy running-config startup-config


                    Example:
                    switch# copy running-config startup-config
                     

                    Copies the running configuration to the start-up configuration.

                     

                    Removing the Configuration for a Missing Module

                    When you remove an I/O module from the chassis, you can also remove the configuration for that module from the running configuration.


                    Note

                    You can only remove the configuration for an empty slot in the chassis.
                    Before You Begin

                    Remove the I/O module from the chassis.

                    Procedure
                        Command or Action Purpose
                      Step 1 show hardware


                      Example: 
                      switch# show hardware
                                              		(Optional)

                      Displays the installed hardware for the device.

                       
                      Step 2 purge module slot running-config


                      Example: 
                      switch# purge module 3 running-config
                       

                      Removes the configuration for a missing module from the running configuration.

                       
                      Step 3 copy running-config startup-config


                      Example: 
                      switch# copy running-config startup-config
                                              		(Optional)

                      Copies the running configuration to the startup configuration.

                       

                      Erasing a Configuration

                      You can erase the configuration on your device to return to the factory defaults.

                      You can erase the following configuration files saved in the persistent memory on the device:

                      • Startup
                      • Boot
                      • Debug

                      Note

                      The write erase command erases the entire startup configuration , except for the following:

                      • Boot variable definitions
                      • The IPv4 configuration on the mgmt0 interface, including the following:
                        • Address
                        • Subnet mask

                      To remove the boot variable definitions and the IPv4 configuration on the mgmt0 interface, use the write erase boot command.

                      Procedure
                          Command or Action Purpose
                        Step 1 write erase [boot | debug]


                        Example: 
                        switch# write erase
Warning: This command will erase the startup-configuration.
Do you wish to proceed anyway? (y/n)  [n] y
                         

                        Erases configurations in persistent memory. The default action erases the startup configuration.

                        The boot option erases the boot variable definitions and the IPv4 configuration on the mgmt0 interface.

                        The debug option erases the debugging configuration.

                        Note   

                        The running configuration file is not affected by this command.

                         

                        Clearing Inactive Configurations

                        You can clear inactive QoS and/or ACL configurations.

                        Procedure
                            Command or Action Purpose
                          Step 1 show running-config type inactive-if-config


                          Example:
                          # show running-config ipqos inactive-if-config
                                                      		(Optional)

                          Displays any inactive ACL or QoS configurations.

                          The values for the type argument are aclmgr and ipqos.

                          • aclmgr: Display any inactive configurations for aclmgr.
                          • ipqos: Display any inactive configurations for qosmgr.
                           
                          Step 2 clear inactive-config policy


                          Example: 
                          # clear inactive-config qos 
clear qos inactive config
Inactive if config for QoS manager is saved at/bootflash/qos_inactive_if_config.cfg 
for vdc default & for other than default vdc: /bootflash/vdc_x/qos_inactive_if_config.cfg (where x is vdc number)
you can see the log file @ show inactive-if-config log
                           

                          Clears inactive configurations.

                          The values for the policy argument are qos and acl.

                          The following describes the values:

                          • qos: Clear inactive QoS configurations.
                          • acl: Clear inactive ACL configurations.
                          • acl qos: Clear inactive ACL configurations and inactive QoS configurations.
                           
                          Step 3 show inactive-if-config log


                          Example:
                          # show inactive-if-config log
                                                      		(Optional)

                          Displays the commands that were used to clear the inactive configurations.

                           

                          Examples of Working with Configuration Files

                          This section includes examples of working with configuration files.

                          Copying Configuration Files

                          This example shows how to copy a running configuration to the bootflash: file system:

                          Backing Up Configuration Files

                          This example shows how to back up the startup configuration to the bootflash: file system (ASCII file):

                          switch# copy startup-config bootflash:my-config

                          This example shows how to back up the startup configuration to the TFTP server (ASCII file):

                          switch# copy startup-config tftp://172.16.10.100/my-config

                          This example shows how to back up the running configuration to the bootflash: file system (ASCII file):

                          switch# copy running-config bootflash:my-config

                          Rolling Back to a Previous Configuration

                          To roll back your configuration to a snapshot copy of a previously saved configuration, you need to perform the following steps:

                          1. Clear the current running image with the write erase command.
                          2. Restart the device with the reload command.
                          3. Copy the previously saved configuration file to the running configuration with the copy configuration_file running-configuration command.
                          4. Copy the running configuration to the start-up configuration with the copy running-config startup-config command.

                          Related Documents for Configuration files

                          Related Topic

                          Document Title

                          Cisco NX-OS Licensing

                          Cisco NX-OS Licensing Guide

                          Command Reference

                          Cisco Nexus 3548 Switch NX-OS Fundamentals Command Reference