le=none aria-label="See also"><a href=#see-also>See also</a></li></ol><hr></div></nav><p>Follow this guide to install the Istio control plane on both <code>cluster1</code> and
<code>cluster2</code>, making each a <span class=term data-title="Primary Cluster" data-body='<p>A primary cluster is a <a href="/docs/reference/glossary/#cluster">cluster</a> with a
<a href="/docs/reference/glossary/#control-plane">control plane</a>. A single
<a href="/docs/reference/glossary/#service-mesh">mesh</a> can have more tha