CMMVC6579E The command cannot be initiated because the cluster Ethernet port 1 must always be fully configured in either the IPv4 or IPv6 format.

Explanation
This error can be caused by an attempt to delete
the only address that is configured on the primary Ethernet port on
the cluster.

User response
When you delete an IP address on the primary Ethernet
port, ensure that the other supported IP format is already configured
on that port.