Lane communicates with a series of ATM connections. The LE is maintained to transmit data and control traffic. Control connections include direct configuration of virtual channel connectivity (VCC), directly control VCC and distribution control VCC. Direct configuration VCC is a two-way point-to-point VCC, which is set by the LEC to the LECS; direct control VCC is also a two-way VCC, which is set to the LES by the LEC; distribution control VCC is a single-way VCC, returning from LES, usually this is One point is a multi-point connection. Data connection includes direct data VCC. Multicast broadcast VCC and multipoint broadcast pass VCC. Direct data VCC is a two-way point-to-point VCC set between two LCs that wish to exchange data. Usually two LEC uses the same direct data VCC to transfer all of the packets between them, rather than establishing a new VCC to each pair of MAC addresses between them, which saves the waiting time for connecting resources and setting connections; Point Broadcasting VCC is also a two-way point-to-point VCC, which is set by the LEC to the bus; multipoint broadcast passed VCC is a single-way VCC, which is set from BUS to LEC, usually this is a point to multi-point connection, each LEC It is its leaf node. LAN Simulation Operation includes initialization. Three stages of connection and data transmission. 1. When initialization is initialized, the LEC registers its own ATM address through the address, then, the LEC sets a direct configuration connection to the LECS. The LEC can find the location of the LECS through three ways: use a determined ANI process to determine the address of the LECS; use one The address of the known LECs; uses a permanent connection to LECs (VPI: 0, VCI = 17). After determining the location of the LECS, the LEC will establish a direct configuration VCC to the LECS. Once connected, the LECs use a configuration protocol to notify the LEC, connect it to the target ELAN, which includes the LES's ATM address. The type of Simulated LAN. The size of the maximum packet on the ELAN and the name of the ELAN. 2. Connecting the LEC to get the LES address, that is, clear the direct configuration of the LEC, and then set to the direct control VCC of LES, and LES specifies a unique LEC identifier (LECID), then LEC register your own Mac on LES. And the ATM address. Subsequently, LES sets a distribution control VCC that returns to the LEC. Such LEC can use a direct or distributed control VCC to use a direct or distributed control VCC in the LAN Simulation ARP (LE-ARP) to correspond to the ATM address of a particular MAC address. In this process, the LEC constitutes a Le-ARP and sent it to the LES. If LES can identify this mapping (because some LEC registers the MAC address), you can directly answer the VCC directly, and transfer the request to the distribution control VCC, request a response to a LEC address that knows the MAC address. If an LEC can respond to Le-ARP, it will control the VCC response LES by direct control. Then, the LES can only pass this response to the requested LEC, or pass the distribution control to all LEC, so all LEC can get and cache this particular address mapping. To complete initialization, LEC uses this Le an ARP mechanism to determine the BUS's ATM address. It is done by sending the LE-ARP of the MAC broadcast address to the LES, and the latter responds with the ATM address of the BUS. Then, the LEC is set to the multipoint broadcast of BUS to send VCC. Next, this BUS sets a multipoint broadcast, transferring the VCC to the LEC, usually using the leaf node that points to a multi-point connection. Such LEC is prepared for data transmission.
