ESXi Host Alert

Hi Experts,

Suddenly I have started to receive the following alerts from one of our ESXi hosts, I tried to reboot the hosts but still the issue is not fixed yet, can you please advise what I need to look at for the investigation.

Event alarm expression: Lost Network Connectivity; Status = Yellow] OR [Event alarm expression: Lost Network Connectivity; Status = Red] OR [Event alarm expression: Lost Network Connectivity to DVPorts; Status = Red] OR [Event alarm expression: Restored Network Connectivity to DVPorts; Status = Green] OR [Event alarm expression: Restored network connectivity to portgroups; Status = Green])
 
Event details:
 Lost network connectivity on virtual switch "vSwitch10". Physical NIC vmnic20 is down. Affected portgroups:"VLAN65", "VLAN39", "Management Network".

Those VMs are in the hosts, they are up and running without any issues but not sure why the alert is generating each day.
ipsec600Asked:
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Haris DulicIT ArchitectCommented:
Hi,

i think the key word here is the Physical NIC vmnic20 is down , and since the VM are working fine most probably the vSwitch10 has multiple NIC  i.e. there is a failover option...

Check the settings for the vSwitch10  and status for the NIC vmnic20 ...

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check your physical switch, and check a cable has not been removed from the server!

Sometimes, this does occur at random.
andyalderSaggar maker's framemakerCommented:
With 10Gb Qlogic NICs it happens all the time :(
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Vaseem MohammedCommented:
In one of my experience an ESXi server with 4 nics on which  2 vSwitch with 2 nics each, one of the nic was flipping online/offline.
After moving the effected nic to different vSwitch, it worked fine, don't know why the nic didn't like vSwitch1.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
sometimes referred to as a "flapping port"
ipsec600Author Commented:
Thank you Guys for your reply, all of your advise helps to investigate and apology for the delay feedback.
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