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ESXi bug causes Cisco VPC’s to not function correctly

After hours and hours and hours of troubleshooting, we’ve finally figured out why our brand new C260 ESX hosts that we’re installed in a VPC were not functioning correctly. At the most, only 3 interfaces were ever able to come online, bringing the fourth would take the entire host down.

The problem?

The C260 uses one of the physical MAC addresses for vmk0 instead of a traditional ESX virtual MAC like 00:50……, this throws the whole gammet out the door.

After hours of digging I found this…

The workaround? re-create vmk0, which is quite simple.

Delete vmk0

esxcfg-vmknic -d -p "Management Network"

Re-create vmk0

esxcfg-vmknic -a -i -n "Management Network"

Reboot the host and away you go!

with the C220’s, we were also forced to re-create vSwitch0 before everything would work.. yuk.

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