I apologize, I wish there was better news to give you, but on these switch multicast nlb is not supported. Page 1184 of the config guide outlines that only unicast mode is supported. [URL] I am not aware of any for sure workarounds. However I did run across this article that describes addind static ARP and MAC table entries for a Cisco switch. [URL] May be worth testing to see if it is a possible workaround. 
I'll keep this short as there isn't a lot to it.  I have an ESX cluster (8 servers) connected to a 8024f. There are 2 vlans that the ESX cluster operates on, I am able to connect to both of them from my desktop. The switch has a very basic config, mostly trunk all ports to ESX and 4 ports ether-channeled to the core Cisco. I have been tasked with getting MS NLB multicast working, but I've had a %$&& of a time doing it. For the most part I've enabled multicast but I'm not having any luck so I went further to also enable IGMP ... then I made it a querier. At the end of the day I didn't get anywhere except one screen (MFDB IGMP Snooping table) that seems to tell me that on my one VLAN there are 2 dynamic "Network Assist" mac address for two different ports (labeled under "Table" and those same mac addresses are listed under "Forbidden ports"  What am I doing wrong? Funny thing is this was working (I admit with a lot less of a config before today) a week ago until one of the VMware engineers tweaked with an interface   Update- I wrote all this yesterday but it seems that it was never posted. Sense then I decided to remove all the commands from the switch that I entered in for this and start from scratch. I will be creating a port on the switch and assigning my laptop to it. If I can connect to the cluster then I’ll know that the problem is at the core Cisco switch… and I’ll be asking that question here as well. I made no special changes to the core when connecting this switch for multicast, considering the core is already running multicast I didn’t think I had to   console#show run   !Current Configuration: !System Description "Powerconnect 8024F, 4.2.0.4, VxWorks 6.6" !System Software Version 4.2.0.4 !Cut-through mode is configured as disabled ! configure vlan database vlan 46-47,442 ip igmp snooping 442 ip igmp snooping querier 442 ip igmp snooping querier 442 address 10.168.47.5 ip igmp snooping querier election participate 442 vlan routing 442 1 vlan routing 47 3 exit stack member 1 2   ! PC8024F exit logging file debugging ip routing ip default-gateway 10.168.47.1       ip route 0.0.0.0 0.0.0.0 10.168.47.1 253 interface vlan 47 exit interface vlan 442 ip address 10.168.47.5 255.255.255.0 ip igmp exit   mac address-table multicast forward-all vlan 442 ip igmp snooping ipv6 mld snooping ip igmp snooping querier ip igmp snooping querier address 10.168.47.5 ip multicast ip igmp       ip pim dense ! interface Te1/0/1 ip igmp snooping switchport mode trunk exit ! interface Te1/0/2 ip igmp snooping switchport mode trunk exit ! interface Te1/0/3 ip igmp snooping switchport mode trunk exit ! interface Te1/0/4 duplex full ip igmp snooping switchport mode trunk       exit ! interface Te1/0/5 ip igmp snooping switchport mode trunk exit ! interface Te1/0/6 ip igmp snooping switchport mode trunk exit ! interface Te1/0/7 ip igmp snooping switchport mode trunk exit ! interface Te1/0/8 ip igmp snooping switchport mode trunk exit       ! interface Te1/0/9 ip igmp snooping switchport mode trunk exit ! interface Te1/0/10 ip igmp snooping switchport mode trunk exit ! interface Te1/0/11 ip igmp snooping switchport mode trunk exit ! interface Te1/0/12 ip igmp snooping switchport mode trunk exit !       interface Te1/0/13 ip igmp snooping switchport mode trunk exit ! interface Te1/0/14 ip igmp snooping switchport mode trunk exit ! interface Te1/0/15 ip igmp snooping switchport mode trunk exit ! interface Te1/0/16 ip igmp snooping switchport mode trunk exit ! interface Te1/0/17       ip igmp snooping switchport mode trunk exit ! interface Te1/0/18 ip igmp snooping switchport mode trunk exit ! interface Te1/0/19 ip igmp snooping switchport mode trunk exit ! interface Te1/0/20 ip igmp snooping switchport mode trunk exit ! interface Te1/0/21 channel-group 1 mode on       ip igmp snooping switchport mode trunk exit ! interface Te1/0/22 ip igmp snooping switchport mode trunk exit ! interface Te1/0/23 channel-group 1 mode on switchport mode trunk exit ! interface Te1/0/24 switchport access vlan 442 exit ! interface port-channel 1 switchport mode trunk exit    
MS NLB, Dell 8024f and my multicast nightmare