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Running configuration
The running configuration includes unchanged startup settings and new settings. The running
configuration is stored in memory and is cleared at a device reboot or power off. To use the running
configuration after a power cycling or reboot, save it to a configuration file.
To display the running configuration, use the
display current-configuration
command.
Next-startup configuration file redundancy
You can specify one main next-startup configuration file and one backup next-startup configuration
file for redundancy.
At startup, the device tries to select the .cfg startup configuration in the following order:
1.
The main next-startup configuration file.
2.
The backup next-startup configuration file if the main next-startup configuration file is
unavailable.
If both the main and backup next-startup configuration files are not available, the device starts up
with the factory defaults.
Configuration file formats
Configuration files you specify for saving configuration must use the .cfg extension. A .cfg
configuration file is a human-readable text file and its contents can be displayed by using the
more
command. When you save configuration to a .cfg file, the device automatically saves the
configuration to an .mdb user-inaccessible binary file that has the same name as the .cfg file. The
device loads an .mdb file faster than loading a .cfg file.
Startup configuration file selection
At startup, the device uses the following procedure to identify the configuration file to load:
1.
The device searches for a valid .cfg next-startup configuration file. For more information about
the file selection rules, see "
Next-startup configuration file redundancy
2.
If a valid .cfg next-startup configuration file is found, the device searches for an .mdb file that
has the same name and content as the .cfg file.
3.
If a matching .mdb file is found, the device starts up with the .mdb file. If none is found, the
device starts up with the .cfg file.
If no .cfg next-startup configuration files are available, the device starts up with the factory defaults.
Unless otherwise stated, the term "configuration file" in this document refers to a .cfg configuration
file.
Configuration file content organization and format
IMPORTANT:
To run on the device, a configuration file must meet the content and format requirements. To ensure
a successful configuration load at startup, use a configuration file created on the device. If you edit
the configuration file, make sure all edits are compliant with the requirements.
A configuration file must meet the following requirements:
•
All commands are saved in their complete form.
•
Commands are sorted into sections by different command views, including system view,
interface view, protocol view, and user line view.
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