Esxi 5, LACP and D-Link Switches

Hi All

I have the below configuration:

x2 D-Link DGS-3100 Series Switches - In a Stack - LACP has been enabled on Ports 21-24

I have two Esxi 5 servers both have been configured for Link Aggregation as per: 

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004048

I am really struggling to get link aggregation to work using these D-Link switches. As soon as I plug the Esxi Servers into the aggregated ports the servers drop off the network, plug them back into a non-aggregated port and they work fine again.

I have then since read this: http://www.vmware.com/files/pdf/virtual_networking_concepts.pdf which actually seems to say that LACP is not supported.

Is anyone able to help or clarify any of this for me please? Any help would be greatly appreciated.

Thanks

David