Internetwork layer protocols such as IP, IPX and AppleTalk use routers to allow communication across subnet boundaries. Subnets are often built using LAN technologies, Ethernet and Token Ring being the most popular.
The ATM Forum’s LAN Emulation LANE provides Emulated LANs (ELANs) that emulate the services of Ethernet
and Token Ring LANs across an ATM network. LANE provides many benefits including interoperation with Ethernet and Token Ring hardware and software, allowing a subnet to be bridged across an ATM/LAN boundary. LANE allows a single ATM network to support multiple ELANs. By using ELANs, internetwork layer protocols may operate over an ATM network in essentially the same way that they operate over Ethernet and Token Ring LANs. While LANE provides an effective means for bridging intra-subnet data across an ATM network, intersubnet traffic still needs to be forwarded through routers.
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