storage failover hwassist showコマンドの出力「Did not receive hwassist keep alive alerts from partner」

環境

• ONTAP 9
• 管理ネットワークセグメントとデータネットワークセグメントが同じである

問題

storage failover hwassist show コマンドは以下のようなエラーを表示します。

node01::> storage failover hwassist show
  Node

-----------------
  node01
                               Partner: node02
                      Hwassist Enabled:true
                           Hwassist IP: 192.168.53.91
                         Hwassist Port: 4444
                         Monitor Status: active
                       Inactive Reason: -
                     Corrective Action: -
                     Keep-Alive Status: Error: did not receive hwassist keep alive alerts from partner.                 

  node02
                Partner: node01
                      Hwassist Enabled: true
                           Hwassist IP: 192.168.53.92
                         Hwassist Port: 4444
                        Monitor Status: active
                       Inactive Reason: -
                     Corrective Action: -
                     Keep-Alive Status: Error: did not receive hwassist keep alive alerts from partner.
  2 entries were displayed.

EMSログレポート：

[Node-1: cf_hwassist: cf.hwassist.missedKeepAlive:error]: HW-assisted takeover missing keep-alive messages from HA partner (Node-n2). 
[Node-1: cf_hwassist: cf.hwassist.recvKeepAlive:info]: hw_assist: Received hw_assist KeepAlive alert from partner(Node-n2).