Ie: When you create the domain DOMAIN.com also setup A records for ns1.DOMAIN.com and ns2.DOMAIN.com wih the right ip addresses and NS records pointing to those. The registrar will create the glue records for you.
Scenario: You have (or provide DNS service for) lots and lots of domains.
You only do this for your first domain, all the others point to the ns of the
1st one
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Jean-Francois Pirus