CONTAP-187143: Interconnect ports e0a/e0b down on AFF-A400

Issue

• HA Interconnect ports e0a and e0b offline with storage failover status:
  ::*> storage failover show -node *
  Takeover
  Node Partner Possible State Description
  -------------- -------------- -------- -------------------------------------
  node_name-1 node_name-2 false Waiting for scc63n08b, Takeover is
  not possible: Storage failover
  interconnect error, NVRAM log not
  synchronized
  node_name-2 node_name-1 false Waiting for scc63n08a, Takeover is
  not possible: Storage failover
  interconnect error, NVRAM log not
  synchronized
  2 entries were displayed.
  

• HA interconnect ports not recoverable in the ONTAP CLI with:
  ::*> system ha interconnect status show -node *
  Node: node_name-1
  Link 0 Status: down
  Link 1 Status: down
  Is Link 0 Active: false
  Is Link 1 Active: false
  IC RDMA Connection: down
  Node: node_name-2
  Link 0 Status: down
  Link 1 Status: down
  Is Link 0 Active: false
  Is Link 1 Active: false
  IC RDMA Connection: down
  2 entries were displayed.
  

• HA interconnect cable loopback shows operational link up in one of the controllers