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Mystery of the broken VM

Mystery of the broken VM

Today my colleague (vmware administrator) asked me a small favour – help to perform RCA (root cause analyze) – related to one of production VM that had recently a problem. VM for some reason was migrated (collegue stands that it happened without administrative intervention) to other ESXi host that do not have proper network config for this vm – this caused outage for whole system. I asked about issue time and we went deeper into logs in order to find…

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ESXi host connection lost due to CDP/LLDP protocol

ESXi host connection lost due to CDP/LLDP protocol

You can observe some random and intermittent loss of connection to ESXi 6.0 host running on Dell servers (both Rack and Blade). It’s caused by a bug with Cisco Discovery Protocol /Link Layer Discovery Protocol.  It can be also seen while generating VMware support log bundle because during this process these protocol are also used to include information about the network.   What are these protocols for? Both of them perform similar roles in the local area network. They are…

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