A cluster that is part of a site can have one of two roles, controller or member:
A cluster that has the controller role for a site is authorized to perform operations on the other site members and the multigroups they manage. The controller authorization is based on mutual agreement, any cluster can propose itself as a controller, but it can only control those clusters which have then agreed to accept its authority.
A cluster that is a simple site member has agreed to accept commands from the site controllers, but cannot issue commands with site-wide effect.
This section provides the following procedures to change the role of a site cluster: