> Has anything changed with regard to vSphere networking best practices or recommended configurations for use with Windows NLB ?
no, nothing has changed wrt NLB for vSphere. The only deltas for those KBs should be the UI specifics of how to set various things in the examples, but even if you are using vDS, there is pretty much a 1:1 mapping of the relevant UI.
> Is IGMP snooping available in vSwitches or dvSwitches ?
not specifically IGMP snooping. Physical switches do IGMP snooping in order to know what multicast groups the hosts on a port are interested in. for vSwitches and dvSwitches, we already know that bc the guest sets the multicast filter in the vNIC, so there is no need to snoop IGMP. The one thing we do do with IGMP is poke the guest with an IGMP query after a vmotion of teaming failure so that it will emit an IGMP report whihc will update the physical switches.
> Would it help with the requirement for static ARP/MAC entries on the pSwitches ?
It would not help the need for static ARP entries, since that it purely a physical router issue with NLB that exists even without virtualization.
If you were putting static multicast MAC entries in your physical switches to avoid issues in failover or vmotion, then the IGMP query I mentioned above will help. That was introduced in 3.5U2.
