It’s amazing how much is going on when you dig through logs. On this occasion I was looking at “tasks & events” of a host and noticed a lot of network errors.
Alarm ‘Network uplink redundancy lost’ on triggered an action
The error was occurring every 5 minutes. This was made visual with the use of Log Insight. My new favourite tool.
appname source hostname vc_event_type vc_alarm_type
appname source hostname vc_event_type vc_alarm_type
I couldn’t find anything wrong with this particular ESXi host, vSwitch or uplink. It had the same configuration as all the other hosts in the cluster.
The fix was to go to the top level where the alarm is defined, Edit Settings, disable the alarm, then go back and re-enable it.
After that, the errors stopped appearing.
appname vc_username source hostname vc_event_type vc_details
appname vc_username source hostname vc_event_type vc_details
The Odd Angry Shot 
Hello Daunce,
I have same issue at the moment, errors also stopped for me by following your steps
however on checking logs within host, issue is still there.
So you should remove this blog, which provides a wrong soln, which only stops events from coming.
BR
Hi BR.
Of course you need to re-enable the alarm.
In my case it was a false positive.
Your situation may be different. If it continues, contact VMware support.
Thanks! Turning this alarm off then back on fixed the same issue here. Wonder what might trigger that.
Ran the most recent updates for 5.5 and this alarm triggered afterwords. Disabling then re-enabling still fixed it! Thanks for posting the tip.
Issue still occurring in esxi 6.0 just disabled and then reenabled we will see what happens
thanks man that did the trick it is VC 5.0. And email keeps popping after every 5 minutes.
This worked great on an ESXi 5.1.0 host. We had a network switch problem that caused links to go up and down. The alarms continued after the switch stack restart even though the connections were all restored.