NIC teaming in ESX/ESXi

If you have four physical NICs teamed and connected to a vSwitch with 20 VMs, is the traffic truly load-balanced across all four NICs?
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Kevin_LeadbeaterCommented:
There are several different load balancing options, and if you have a cluster with VMotion or Fault Tolerance, and if security or performance is a concern - and it certainly should be in a good design - then you'd want to isolate management traffic so the perfromance of your VMs isn't affected.

This is a very detailed guide (albeit for ESXi 3.5) that explains the intricacies of setting up vSwitches and port groups.

http://kensvirtualreality.wordpress.com/files/2009/12/the-great-vswitch-debate-combined.pdf
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rvivek_2002Commented:
Out going traffic is load balanced by default  However to balance the load of incoming traffic, you will have to create a ether channel on the Physical switch port.  
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michelkeusCommented:
Normal Load balancing is normally 1 of 4 algorithms:
  • Route based on originating virtual port ID
  • Route based on IP hash
  • Route based on Source MAC hash
  • Use explicit failover order
With the arrival of 4.1 the virtual Distributed Switch also offers true load-based load balancing. See here: http://kb.vmware.com/kb/1022590

vDS does require you have the Enterprise Plus-license.
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