When networking issues arise a good place to start is ESXTOP:
SSH into the ESXI host >> esxtop >> press 'n'.
This will present you will all of your ports, network labels, vSwitch names and so on. The significant columns here are '%DRPTX' and '%DRPRX' - hence indicating that the vSwitch queue has been exhausted and packets are being dropped.
The other columns are reperesented as follows:
- MbTX/s: Data transmitted in mbps.
- MbRX/s: Data recieved in mbps.
- PKTTX/s: Average number of packets transmitted per second
- PKTRX/s: Average number of packets recieved per second
Possible causes could be:
- High guest CPU utilization
- Insufficient bandwidth supplied by the uplink
Possible resolutions include:
- Network I/O control
- Moving network hungry VM's onto another host
- Upgrading the uplink capacity
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