I have two 4506 switches running HSRP for a server vlan. On the server vlan my server guy has deployed two servers running microsoft NLB in vmware. I had to put a static arp entry in my 2 cores but HSRP doesn't seem to be acting rght. After the static arp entry we were able to ping the microsoft NLB'd virtual server. We simulated a failure on the server vlan and the secondary HSRP 4506 didn't take over as the active gateway. Any ideas?