Virtual networks with assigned connectivity templates can't be deleted.
You can delete multiple virtual networks from one
dialog in the Apstra GUI, as of Apstra version 4.1.2.
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From the blueprint, navigate to Staged > Virtual > Virtual
Networks and select the check boxes for the virtual networks
to delete. (Tip: Use the Query function to filter specific virtual
networks.)
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Click the Delete selected virtual networks button
that becomes available. Click the drop-down triangle to show (or hide)
selected VN names. The virtual networks that will be deleted are listed. If
you've selected virtual networks that have connectivity templates assigned
to them, they are listed as not being available for deletion. They'll be
ignored.
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Click Delete to stage the deletion and return to the
table view.