DS3524报如下错误，请问是什么问题？？感谢？

Date/Time: 17-8-28 20:13:26
Sequence number: 12491
Event type: 5801
Event category: Internal
Priority: Informational
Event needs attention: false
Event send alert: false
Event visibility: true
Description: Management port link down
Event specific codes: 0/0/0
Component type: Controller
Component location: Enclosure 99, Slot B
Logged by: Controller in slot B