/a></li><li role=none><a role=treeitem title="Upgrade or downgrade Istio in place." href=/v1.9/docs/setup/upgrade/in-place/>In-place Upgrades</a></li><li role=none><a role=treeitem title="Configuring and upgrading Istio with gateways (experimental)." href=/v1.9/docs/setup/upgrade/gateways/>Managing Gateways with Multiple Revisions [Experimental]</a></li></ul></li><li role=treeitem aria-label="More Guides"><button aria-hidden=true></button><a title="More information on additional setup tasks." href=/v1.9/doc