The VMware host network redundancy degraded error shows that the host has lost or degraded network uplink redundancy on the virtual switch. This will result in a loss of functionality of applications for Oracle on VMware and SQL Server on VMware environments.
The VMware ESX host has lost one redundant uplink to the physical network from one or more portgroups. While the portgroups are still connected there may be no redundant uplinks remaining.
The solution to this issue involves connecting to the VMware ESX host to identify available uplinks, remove the reported vmnic from the portgroups, and linking available portgroups to the affected groups.
Note: After checking the status of the vmnic through vSphere, you may determine that the issue is hardware related. If so, you will want to complete the recommended tuning procedures for the affected hardware.
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