ATM LAN EMULATION (LANE)

ATM LANE FUNDAMENTALS

ATM LAN emulation (LANE) enables virtual LAN (VLAN) implementations across ATM backbone networks that reflect the logical associations of workgroups regardless of the physical location of workgroup participants. Modifications in virtual ATM LANE topologies are accomplished by redefining workgroups in the network management system and reconfiguring software in ATM switches. MPOA (MultiProtocol-over-ATM) enables direct transmission of virtual ATM LANE traffic over the ATM Physical Layer or Layer 1 of the OSI Reference Model. The Cells-in-Frames (CIF) Alliance supports implementation of ATM desk area networks (DANs) that operate in concert with the virtual ATM LANE infrastructure. ATM LANES are also called ATM ELANs (Emulated LANs).


ATM EMULATED LANS (LANES) IN ACTION

ATM LANEs are scalable and flexible, feature sophisticated network management and control capabilities, and perform functions equivalent to those supported by conventional Ethernet and Token Ring VLANs (Virtual LANs). ATM LANES enable each participant in a logical workgroup to take part in collaborative networking activities. Internetworking devices such as bridges and routers support voice, video, and data exchange between participants in enterprisewide ATM LANEs.

In an ATM LANE, local networking applications access an ATM network con- figuration via IP protocols. IP packets are transported in ATM cells. ATM LANEs use LAN Emulation User-to-Network Interfaces (LUNIs) and LAN Emulation Network- to-Node or Network-to-Network Interfaces (LNNIs) to provision QoS guarantees, Internet telephony, and connectionless unicast and multicast delivery. ATM LANEs support MAC (Medium Access Control) operations at the Data-Link Layer or Layer 2 of the OSI Reference Model.