Cisco Systems provides Token Ring and Fast Ethernet inter-VLAN bridging and routing capabilities with the Dual-Port Token Ring ISL Port Adapter PA-2FEISL-FX. The PA-2FEISL enables network administrators to bridge and route multiple VLANs of Token Ring and Ethernet traffic over the same high-speed backbone trunks. The two-port Token Ring ISL fiber and copper port adapters deliver Fast Ethernet with ISL VLAN transport over switch-to-switch backbone connections or switch-to-server data-center attachments, but do not provide line-rate Fast Ethernet performance.With inter-VLAN bridging and routing functionality, network administrators can architect a smooth migration path from Token Ring to 100-Mbps or Gigabit Ethernet backbone environments. Network administrators can deploy 100-Mbps Token Ring VLAN transport, 100-Mbps Ethernet VLAN transport, and bridging or routing between the mixed LAN types using the same physical ISL trunk links.