All-round explanation of LAN switch Simulation Server

LAN switches are quite common. So I studied the LAN switch Simulation server and shared it with you here. I hope it will be useful to you. The ATM Nic or the atm lan switch that interfaces with ELAN supports a LEC on each connected ELAN. That is to say, LEC is a single LANE client and can also be an ELAN network. Each LEC is identified by an independent ATM address. The LANE server can be divided into three functions:

LAN switch Simulation Server LANE Server, LES)

The LANE server is responsible for providing necessary control functions for successful simulated LAN Operations. The LES server can be connected to an ATM server, router, or LAN switch, and can be centralized or distributed over the network. LES Server Management applies to add a VLAN to the LEC client. The LES server also registers the MAC address and splits the MAC address into an ATM address. When the LEC client is added to the simulation LANELAN), it registers its LAN destination address with the LES server and maps the MAC address to the ATM address.

The LES server maintains MAC-to-ATM address conversion for all LEC clients on its ELAN. For example, if a LEC client needs to transmit point-to-point data, it generates a LE-APR request to the LE server. The LE-APR protocol splits the MAC destination address of the LEC client into an ATM address. The LES server sends a LE-APR to respond directly to a request from the LEC client, or to another LEC client so that it can directly respond to the request. After receiving the LE-APR response, the LEC client establishes a connection to the destination client in the ELAN network with the ATM destination address contained in the response and uses the UNI signal. After an ATM connection is established, the LEC client starts data transmission. One ELAN has only one LES.

Broadcast and unknown address server Broadcast & UnknownServer, BUS)

When the source LEC client cannot resolve the MAC address to an ATM address, the BUS is responsible for forwarding data that includes the point-to-point MAC address group address, broadcast address, and functional address, that is, simulate the broadcast mechanism of the traditional LAN and establish the LEC data before the direct link between LEC. The LEC client forwards all broadcast services, point-to-point services, and unresolved MAC/ATM address services to the BUS. The BUS transmits point-to-point data to each client that has established a connection with the BUS. In this way, the broadcast performance of the IEEE 802x LAN switch is simulated. One ELAN has only one BUS.

Each LEC is connected to only one BUS on the ELAN, but there may be multiple buses on a specific ELAN, which communicate and coordinate in a vendor-determined manner. The LEC-connected BUS is identified by a proprietary ATM address and connected to the les bus. Its ATM address is associated with the broadcast MAC address. The ing relationship is usually configured in LES. LECS assigns each LANE client to a specific ELAN by assigning it to the corresponding LES.

LAN switch Simulation structure Server LANE Configuration Server, LECS)

Multiple Elans can be connected in an ATM network. If multiple Elans are connected, you need to configure LECS. LECS stores the structure information of each LANE and configures LEC to ELAN. Maintains the configuration information of LEC, LES, and BUS in multiple Elans in an ATM network, and provides each LEC with its les atm address. Each management domain has only one logic LECS, which is the ELAN service in this domain. These three service entities can exist separately, but are usually located on the same device.