This article describes the steps to reconfigure the PNID.
Note: If vCenter Server High Availability (VCHA) is enabled, you must disable the vCenter Server HA setting before reconfiguring the PNID.
vCenter Server
To reset the PNID, follow the steps below.
For details, see the following document.
Reconfigure the Primary Network Identifier
However, if you are only changing the DNS server, the following tasks are not necessary.