+Clusters constitute a fundamental building bricks of any cyberinfrastructure. SimGrid provides several kinds of clusters:
+crossbar clusters (contention-free internal network), backbone clusters (constrained internal network), fat-trees,
+DragonFly, Torus and generic Star clusters. Each of them are created through the :ref:`pf_tag_cluster` tag, and have a
+highly optimized implementation in SimGrid source code.
+
+The documentation of each cluster kinds is given as :ref:`platform_examples`.