Network layer protocol running on existing networks, such as IP, IPX, AppleTalk, Decnet,
Banyan, Vines, etc., the key to implementing the ATM network and existing multiple LAN network interconnections is
Use the same network layer protocol, such as uniform use IP and IPX protocol, because the network layer is high
Layer protocols and applications provide a consistent network view.
A key factor in the success of the ATM network is to have the ability to interoperate with these technologies. Span
There are two implementations of the ATM network running network layer protocol. A native mode operation, even if the address is changed
The change technology maps the network layer address into an ATM address so that the network layer packet can pass through the ATM network.
give away. Another method of transmitting a network layer packet through an ATM network is LAN Simulation (LANE--LAN EM-
Ulation).
Lane is a local area network at the top of the ATM network. The LANE protocol is specifically defined for IEEE802.3
Simulation of the Ethernet and IEEE 802.5 token ring LAN. Lane means that the LANE protocol is defined in the high level.
The same business interface, data transmitted through the ATM network still seals the corresponding LAN MAC packet format.
. Lane makes all aspects of ATM, including establishment of connectivity, unit segmentation, and recombination (SAR), node
Completely transparent.
Lane can run on an ATM network without any network higher-level protocols. because
The LANE service provides the network-level driver with the same service interface as the existing MAC protocol (such as the network drive
Interface Specification NDLS or Open Data Link Interface ODI driver interface). So don't need to drive
The movement is made for any modification.
The LANE protocol specifies the operation of a single simulation LAN (ELAN), and there are multiple ATMs.
Elan, each ELAN simulation is an Ethernet or token ring network.
The Lane protocol will be used on 2 ATM devices:
(1) ATM network pen card (NIC)
The ATM NIC will execute the LANE protocol and implement the 揍 of the ATM network, on the connected terminal system,
The ATM NIC will provide the current LAN service interface for higher level protocols. In this way, the network layer of the terminal system
The protocol will continue to communicate with the same LAN, and can use the extensive bandwidth of the ATM network.
(2) Network interconnect and LAN switching equipment
It mainly refers to the LAN switch and router connected to the ATM. These devices are connected directly, with
The ATM host is used to provide virtual LAN services. Since the LAN simulation is essentially a bridge on ATM
The basic function of the LANE protocol is to change the MAC address to an ATM address, so LAN emulation special
Don't fit the quick multi-port LAN switching device. For example, IBM is used in the campus computer network in our school.
The company's LANE server implements network interconnects and LAN exchange.
The LAN Simulation Specification Model includes a LAN Simulation Client (LAN Simulation Server (LES), wide
Broadcast and Unknown Server (Bus) and LAN Simulation Configuration Server (LECS).
Data transfer, address analysis, and other control functions are performed for a single terminal system in ELAN.
It also provides a standard service interface to any high-level agency. ATM NIC or LAN with an Elan interface
The switch supports a LEC on each connected ELAN, and each LEC is logged by a separate ATM address.
Knowledge, and one or more MAC addresses can be connected by the ATM address.
LES is a specific ELAN execution control function. Each ELAN has only one logical LES, both of which belongs to one
Specific ELAN. Each LES has an ATM address of your own dedicated to identify.
BUS is a multi-point broadcast server that is to extend unknown target address traffic and deliver multi-point broadcast and broadcast traffic to clients in a particular ELAN. Each LEC is connected to a BUS on the ELAN.
However, there may be multiple BUs on a particular ELAN, which communicate and coordinate in a manner determined. One
The BUS connected to the LEC is identified by an ATM address of your own. In Les, this address is in the broadcast MAC address
Connected, this mapping is usually configured in LES.
LECS specifies the client to a specific one by assigning each LANE client to the ELAN corresponding LES
Elan. Each management domain has only one logical LECS, which is all of the ELAN services in this domain.
The LANE protocol does not specify the specific location of LES, Bus, and LECS. Most manufacturers are in network equipment.
(ATM switches and routers) instead of implementation on the host and workstation to ensure its high performance and reliability.
