ATM LAN Simulation NNI (LANE) enables simulation Lans on the ATM network. A simulation lan provides user data frame communication mode between all users, which is similar to the actual LAN. One or more simulation lans can run on the same ATM network, but each simulation LAN is logically logically independent. Communication between simulation LANs requires a certain interconnect device (bridge, router, etc.), but even in some cases, it is necessary to clearly license Direct ATM connection. LAN Simulation LUNI defines the protocol and interaction between the LAN Simulation Client (Le client) and the LAN imitation server. With LUNI, each Le client can connect a single LES and BUS, but can also connect a single LECS or multiple SMSS.
The LAN Simulation NNI (LNNI) defines the necessary programs that can be seen from each other and provide a hierarchical and reliable LAN simulation services. Single ELANs can be used for LECSS, LESS, BUSS, and SMSS. One LES, Bus or SMS is only used for single ELAN, and one LECS can be used for multiple ELANs. The LANE service component requires multiple VCCs interconnected to facilitate configuration, status, database synchronization, control, and data forwarding. The LNNI specification provides interoperability between components of ELANs, so customers can achieve mixing and matching of Lane services from different vendors.
Lane services have four main components:
LAN Simulation Client LEC: Installed on the ATM Terminal System to implement the LUNI interface. As a LAN system agent, execute data forwarding and address resolution, and provide a MAC emulation Ethernet / IEEE 802.3 or IEEE 802.5 service interface for high-level software. LAN Trip Server LES: Supports address resolution protocol LE-ARP for mapping features that implement the MAC address and the ATM address. A LE client is only connected to a LE server, which can register the LAN target file and / or the multicast address to receive by the LE server. At the same time, the LE client can solve the path descriptor problem of the MAC address or ATM address by querying the Le server. Broadcast / Unknown Server Bus: Processes all forwarding to all additional LACs. The Le client can see unicast and unknown servers. You can select multicast server SMS: Used to deliver multicast processing from BUSS, but also need to forward broadcast frames and undetermined target file frames to effectively forward multicast frames.
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