Or
Generate Physical Interface Network Utilized Report in VMWare using vROPS
Also you may trace maximum network traffic utilized by the VMs.
Click on Object Browser under Environment
Click integrated vCenter from Object browser -> Expend Select datacenter or cluster
Click Metrics -> Click calendar and select the date & time range
Click Metrics > Expend it
Click Network -> Physical and click on Usage Rate
In the right-side next page, you will see usage in graph