See the following two articles by the VMware Networking blog;
http://blogs.vmware.com/networking/2011/12/vds-best-practices-blade-server-deployments.html
Also you should have a look at the NIOC and SIOC documentation;
http://www.vmware.com/files/pdf/techpaper/VMW_Netioc_BestPractices.pdf
http://www.vmware.com/files/pdf/techpaper/VMW-vSphere41-SIOC.pdf
Cheers,
Paul
