You are expanding an existing cluster that uses BES-53248 cluster interconnect switches. You connected the new controllers to ports 0/17 through 0/20. However, you are unable to join the new nodes to the cluster.
Which action must be taken to solve the problem?
When expanding a cluster using BES-53248 cluster interconnect switches and connecting new controllers to additional ports, installing the Cluster Switch Health Monitor (CSHM) configuration file is necessary to ensure proper switch configuration and functionality. Without this file, the switches might not operate correctly, causing the new nodes to fail to join the cluster.
I would go with A! B & D are wrong, C makes no sense because RCF must be installed already because the Switches are already in use.
Selected Answer : A Reference: https://docs.netapp.com/us-en/ontap-systems-switches/switch-bes-53248/configure-reqs-bes53248.html#configuration-requirements
A is correct. According to NetApp’s Knowledge Base, upgrading the reference configuration file (RCF) is not supported when expanding a NetApp cluster1. If a new RCF is required as part of a planned upgrade, the existing configuration should be wiped and a reload of the new config should be performed. The BES-53248 switch comes configured by default with 16 x 10/25GbE (SFP+/SFP28) ports and 2 x 40/100GbE (QSFP+/QSFP28) ports activated. So installing on ports 17 thru 20 needs new license.