enable Microsoft NLB on cisco switch

Microsoft don't follow the rules of some RFC and Cisco doesn't like it

Some things we need from the server admin first
Real servers IP + MAC
Cluster (virtual) IP + MAC

real server1: 192.168.64.11
real server2 192.168.64.12
cluster ip: 192.168.64.13

Confirm the mac addresses and see what vlan they are on
sh arp | i 192.168.64.11
sh arp | i 192.168.64.12

See what ports those mac addresses are seen on (if its a trunk to another switch then you'll have to do same config over there)
sh mac address-table | i xxxx.xxxx.xxxx
sh mac address-table | i yyyy.yyyy.yyyy

Create static mapping for the cluster IP to cluster MAC
arp 192.168.64.13 zzzz.zzzz.zzzz ARPA

Create static mapping for cluter mac to the ports where the real servers are
mac-address-table static zzzz.zzzz.zzzz vlan 64 interface GigabitEthernet5/1

You should be able to ping the cluster IP now (you might have to visit other switches)
ping 192.168.64.13