A Transparent LAN Service is a network service that provides data about the traffic through a network. This type of service is beneficial because it can be implemented as a network management software. These software programs can perform various functions such as controlling network elements and collecting traffic parameters. One of these features is the ability to receive and provide Transparent LAN Services based on the received traffic parameters. A central Network Management System can retrieve the results of these measurements from two interfaces at the same time. This enables the operator to estimate the Quality of services provided and to check whether the customer requirements have been met.
A Transparent LAN Service is defined by Service Level Agreements. These agreements are contracts between a service provider and a customer. The SLAs define the quality of services in both quantitative and statistical terms. For example, throughput, delay, packet loss, and jitter are the key characteristics of a Transparent LAN Service. A shared circuit allows the service provider to carry multiple different services over a single bandwidth.
The quality of Transparent LAN Services is monitored at the layer 2 and aggregate level. This is because TLS flows have different Quality of Service requirements. Since the TLS interfaces are at the layer 2 level, they cannot be checked for performance. In other words, the TTO value must be within CIR and PIR. Then, the network management system can use this data to determine the Quality of Transparent LAN Services.
The quality of Transparent LAN Services can be measured at two levels. The aggregate level is not enough; the flow level is needed to check the quality of each service. Moreover, it is not possible to monitor Quality of Service at the layer 1 and layer 2 interfaces. A Transparent LAN Service can make a separate LAN look like a single large one. For this, it is important to check the TTO value at both the end points.
A Transparent LAN Service uses a shared circuit and is more expensive than a traditional LAN. Its primary advantage is that it requires fewer network interfaces. However, the disadvantage is that it can be affected by congestion. If a Transparent LAN service fails to perform as promised, it can have a negative impact on the user’s performance. A better method is to use a fully transparent WAN.
A transparent LAN service can be configured in point-to-point and multipoint-to-multipoint configurations. It is possible to configure a transparent LAN service in a point-to-point or multipoint-to-multipoint configuration. It can be configured to be a single or multiple-point connection. A Multipoint LAN can have up to three locations. Dedicated LANs are more efficient than point-to-point LANs.
The Quality of Transparent LAN Service can be monitored at several levels. The first level is the aggregate of the TTO values for each network element. The second level is the flow. Using this method, the NMS can estimate the quality of a Transparent LAN Service by taking an arithmetic mean of 24 TTO values. The result is an estimate of the average byte throughput for a day.
A Transparent LAN Service can be carried on a shared circuit or backbone network. The shared circuit is more efficient because it uses fewer network interfaces, but it can be expensive. The second level is the leased circuit. The leased circuit is the preferred method of carrying Transparent LAN Service. It requires the least amount of bandwidth but is more expensive. A shared circuit is the best option if the LANs are spread over many locations.
Another benefit of Transparent LAN Service is that it can be monitored at different levels. The aggregate level of the Quality of service can be compared to the average of TTO values. The TTO value is obtained by summing the TTO values and dividing it by 24. Hence, a TTO value must be between CIR and PIR for the network to be a transparent LAN. There are several benefits of using this kind of a LAN.
In a transparent LAN service, a single physical connection is required to communicate with another. The network element is connected to the backbone through a single network connection. The two networks share the same EVC and TLC. Both of these networks are transparent and have a common physical interface. This method is also useful in managing transient networks. Fig. 3 illustrates a transverse network and shows the flow of a single LAN between the two sub-networks.