Hi. Did you manage to solve this? We're getting between 10 and 100 messages per host per second (which Log Insight gracefully shows me graphically).
The error messages are for the nested ESXi hosts that we are running in the lab environment. If I vMotion them to different underlying hosts, those hosts start spewing these messages instead (again displayed by Log Insight in the "over time grouped by hostname" view).
Snippet:
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2013-12-18T12:34:14.694Z esxi-03.rtsvl.local vmkernel: cpu14:135515)vsla-fence: Fence_Decapsulate:297: port:41000c4b1550:OPI:{01,00003e} Drop unicast packet with hostKeyMac as dest mac
2013-12-18T12:34:14.694Z esxi-03.rtsvl.local vmkernel: cpu14:135515)vsla-fence: Fence_Decapsulate:297: port:41000c4b27e0:OPI:{01,000044} Drop unicast packet with hostKeyMac as dest mac
2013-12-18T12:34:14.694Z esxi-03.rtsvl.local vmkernel: cpu14:135515)vsla-fence: Fence_Decapsulate:297: port:41000c4b3a70:OPI:{01,00003e} Drop unicast packet with hostKeyMac as dest mac
2013-12-18T12:34:14.694Z esxi-03.rtsvl.local vmkernel: cpu14:135515)vsla-fence: Fence_Decapsulate:297: port:41000c4b4d00:OPI:{01,00003f} Drop unicast packet with hostKeyMac as dest mac
2013-12-18T12:34:14.694Z esxi-03.rtsvl.local vmkernel: cpu14:135515)vsla-fence: Fence_Decapsulate:297: port:41000c4a6d80:OPI:{01,00004b} Drop unicast packet with hostKeyMac as dest mac
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/Anders