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CHAPTER 4: SYSTEM CONFIGURATION
4.7 CONFIGURATION OVER DHCP (ZTP)
Config-over-DHCP is available for all Black Box console managers running firmware release 3.16 or later. Using this feature, Black Box
devices can be provisioned during their initial boot from a DHCP server. Provisioning on untrusted networks can be facilitated by providing
keys on a USB flash drive.
The typical steps for configuration over a trusted network are:
Manually configure a same-model Black Box device.
Save its configuration as an Black Box backup (.opg) file.
Select System > Configuration Backup > Remote Backup.
Click Save Backup.
A backup configuration file — model-name_iso-format-date_config.opg —is downloaded from the Black Box device to the local system.
Alternatively, you can save the configuration as an xml file:
Select System > Configuration Backup > XML Configuration. An editable field containing the configuration file in XML format is
presented.
Click into the field to make it active.
If you are running any browser on Windows or Linux, right-click and choose Select All from the contextual menu or press Control-A.
Then right-click and choose Copy from the contextual menu or press Control-C.
If you are using any browser on macOS, choose Edit > Select All or press Command-A. Then choose Edit > Copy or press
Command-C.
In your preferred text-editor, create a new empty document, paste the copied data into the empty document and save the file.
Whatever file-name you choose, it must include the.xml filename suffix.
Copy the saved .opg or .xml file to a public-facing directory on a file server serving at least one of the following protocols: HTTPS,
HTTP, FTP or TFTP.
NOTE: Only HTTPS can be used if the connection between the file server and a to-be-configured Black Box device travels over an untrusted
network.
Configure your DHCP server to include a vendor specific option for Black Box devices. (This will be done in a DHCP server-specific
way.) The vendor specific option should be set to a string containing the URL of the published .opg or .xml file in the step above. The
option string must not exceed 250 characters and it must end in either .opg or .xml.
Connect a new Black Box device (either factory-reset or Config-Erased) to the network and apply power.
NOTE: It may take up to 5 minutes for the device to find the .opg or .xml file via DHCP, download and install the file, and then reboot itself.
4.7.1 ENSURING THE CONSOLE SERVER IS UNCONFIGURED
Console servers exist in two states: configured or unconfigured. For ZTP via Config-over-DHCP to work, a target console server must be
in an unconfigured state.
Console servers ship unconfigured from the factory: assuming a compatible configuration file is to hand (see below), a newly-unboxed
console server can be configured using ZTP.
To return an already-configured console server to its unconfigured state do ether of the following:
While the console server is powered-on, press the recessed Erase button twice. This button is found on the rear or side of every
console server.
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