Windows NT Load Balancing Service and Windows 2000 Network Load Balancing (NLB) is not supported on token ring networks. The system requirements for Windows NT Load Balancing Service state:
The current version of WLBS operates on FDDI or Ethernet-based local area networks within the cluster. It has been tested on 10 megabits per second (Mbps), 100 Mbps, and gigabit Ethernet networks with a wide variety of network adapters.
Although not explicitly stated in the product documentation, Windows NT Load Balancing Service and Windows 2000 NLB does not run on a token ring network.