If you have an existing two-node cluster that uses cluster interconnect switches and is running ONTAP 9.3 or later, you can replace the switches with direct, back-to-back connections between the nodes.
You cannot use the switchless cluster interconnect feature with more than two nodes.
Transitioning to a two-node switchless cluster configuration is a nondisruptive operation. Most systems have two dedicated cluster interconnect ports on each node, but you can also use this procedure for systems with a larger number of dedicated cluster interconnect ports on each node, such as four, six or eight.
This procedure describes transitioning a cluster with a switched cluster network to one where two nodes are directly connected for ONTAP 9.3 and later.