BRAS settings EcoRouter Documentation / BRAS settings
Broadband Remote Access Server
The BRAS (Broadband Remote Access Server) is one of the main element of the internet provider network. BRAS is understood as a device that is responsible for routing within the network, providing access to various services (Internet, IP-telephony, IP-TV) for subscribers through one or several physical connections. With the help of BRAS, it is possible to create and maintain the necessary rules of quality of service (QoS) for different types of traffic with dynamically changing downloads and communication channel parameters.
The main tasks of BRAS are the following:
- assignment and application of network settings on client equipment;
- authentication, authorization and allocation of individual attributes for subscribers;
- accounting, filtering and tariffing of traffic;
- providing the required quality of the services provided;
- flexible connection of new services.
Some of these tasks are handled when BRAS interacts with other devices on the network. For example, authentication and authorization tasks can be completed by accessing to the external Tacacs or Radius servers. The EcoRouter devices allow to use both remote and local AAA servers (running directly on the router) when starting virtual services on the router.
Several protocols are used to provide Internet services. Until recently, the most common protocol was PPPoE (Point-to-point Protocol over Ethernet). The technology of delivery and provision of IP settings to subscribers (IPoE - Internet Protocol over Ethernet) in conjunction with the use of DHCP option 82 is used more often, since it requires a minimum configuration of the and equipment. The Q-in-Q technology, which is an extension of the IEEE 802.1Q standard, is considered to be the most secure. When used, each end device is initially in a dedicated VLAN, which ensures isolation for subscribers one from each other.
The EcoBNGOS supports all the protocols and technologies mentioned above, and the EVC (Ethernet Virtual Connection) concept allows to process tagged traffic flexibly regardless of the chosen connection option for subscribers, thereby ensuring a high degree of isolation for IPoE and PPPoE sessions. (Read more about the service interfaces in the corresponding section of the documentation). For work with IPoE and PPPoE subscribers, the CLI of the device provides an interface with a special name bmi (broadband multiple instances).