Hi Folks,
In the past, it was always recommended to either use multicast for NLB, or put the unicast NLB NIC's in a separate small VLAN to avoid switch-flooding because the switch could not assign the NLB MAC to a single port and hence would flood it to all ports.
I'm wondering what the recommendation is if one is using two NLB cluster nodes on the same Hyper-V host\cluster? It seems to me that even though the same NLB MAC address will be assigned to multiple NLB hosts, the switch will still be able to assign that MAC to a single switch port (connected to the Hyper-V host), and hence will not flood the entire VLAN\subnet. Does this obviate the need for a separate VLAN for that NLB cluster?
Would there be negative ramifications for other VM's on that Hyper-V host's same virtual network? Will the host still flood it to every port on its virtual switch and hence flood all other VM's?
Thanks for any info,
ianc