We have implemented (but not yet released) an enhancement in check_netapp_takeover to check if interconnect-links are up and ok. This additional aspect in the takeover-check is enabled by default:

$ ./check_netapp_takeover.pl -H fl17.europe.example.com
NETAPP_TAKEOVER OK - 9 takeover-aspects checked
interconnect FL17-01: up (Infiniband (Mellanox ConnectX)) RDMA Interconnect is up (Link 0 up (active), Link 1 up (active))
interconnect FL17-02: up (Infiniband (Mellanox ConnectX)) RDMA Interconnect is up (Link 0 up (active), Link 1 up (active))
mc-nodes: ok
mc-lifs: ok
mc-config_replication: ok
mc-aggregates: ok
mc-clusters: ok
node FL17-01: connected (ha mode) The the storage failover facility is enabled. Takeover of partner is possible. Takeover by partner is possible.
node FL17-02: connected (ha mode) The the storage failover facility is enabled. Takeover of partner is possible. Takeover by partner is possible.

This change will be part of the next major release 4.0 scheduled for Autumn 2018. A prerelease for customers who want to test the new features will be available upon request.