Thank you for contacting NetApp community, The complete information with respect to FAS 25xx installation can found in the VIDEO below.
FAS2520 Setup Instructions
The Fas2520 support this type of configuration ?
Yes It Supports Switchless Configuration
The Cluster interfaces are e0d and e0f , for each node ?
The command for switchless mode are:
1. Enter the following command to enable cluster HA:
cluster ha modify -configured true
If storage failover is not already enabled, you will be prompted to confirm enabling of both storage failover and auto-giveback.
If you have a two-node switchless cluster, enter the following commands to verify that the switchless-cluster option is set:
Enter the following command to change to the advanced-privilege level:
set -privilege advanced
Confirm when prompted to continue into advanced mode. The advanced mode prompt appears (*>).
Enter the following command:
network options switchless-cluster show
If the output shows that the value is false, you must issue the following command:
network options switchless-cluster modify true
Enter the following command to return to the admin privilege level:
set -privilege admin