BES-53248 cluster switch is down and not reachable over the console

• ONTAP 9
• FAS/AFF Systems
• BES-53248 Cluster switches

• The cluster ports on the nodes that are connected to the same BES-53248 cluster switch go down at the same time:

Mon Jun 05 12:44:27 [Node1: kernel: netif.linkDown:info]: Ethernet e3a: Link down, check cable.
Mon Jun 05 12:44:27 [Node1: vifmgr: vifmgr.portdown:notice]: A link down event was received on node Node1, port e3a.
                     
Mon Jun 05 12:44:27 [Node2: kernel: netif.linkDown:info]: Ethernet e3a: Link down, check cable.
Mon Jun 05 12:44:27 [Node2: vifmgr: vifmgr.portdown:notice]: A link down event was received on node Node2, port e3a.

• The following alert is reported in the event logs:

[Node2: mgwd: callhome.hm.alert.major:alert]: Call home for Health Monitor process cshm: ClusterSwitchMissing_Alert[Cluster1].

• "system health alert show" output reports following alert:

             Node: Node-1a
           Alert ID: SwitchUnreachable_Alert
           Resource: CS-sw2
           Severity: Major
    Indication Time: Sun May 04 11:24:52 2025
           Suppress: false
 Acknowledge: false
     Probable Cause: The ethernet switch's IP address is not reachable from
                     the local node.
    Possible Effect: Monitoring of the switch and log collection will not
                     function.
Corrective Actions: Ensure that the IP address is reachable or specify the
                     correct reachable IP address.           

• The affected switch is missing from the cluster switch health monitoring (CSHM) table.
• The switch is down and is not reachable via ping or SSH.
• Amber LED is seen on the switch.
• The switch is unresponsive over console access.