Bng Configuration Process; Cisco Asr 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide - Cisco ASR 9000 Series Configuration Manual

Broadband Network Gateway Overview
Access Network Provider
The following figure shows the topology of a Access Network Provider model.
Figure 3: Access Network Provider Model
In the Access Network Provider model, a network carrier (also called the wholesaler) owns the edge network
infrastructure, and provides the broadband connection to the subscriber. However, the network carrier does
not own the broadband network. Instead, the network carrier connects to one of the ISPs that manage the
broadband network.
BNG is implemented by the network carrier and its role is to hand the subscriber traffic off to one of several
ISPs. The hand-off task, from the carrier to the ISP, is implemented by Layer 2 Tunneling Protocol (L2TP)
or Layer 3 Virtual Private Networking (VPN). L2TP requires two distinct network components:
• L2TP Access Concentrator (LAC)—The LAC is provided by the BNG.
• L2TP Network Server (LNS)—The LNS is provided by the ISP.

BNG Configuration Process

Configuring BNG on the Cisco ASR 9000 Series Router involves these stages:
• Configuring RADIUS Server—BNG is configured to interact with the RADIUS server for authentication,
• Activating Control Policy—Control policies are activated to determine the action that BNG takes when
• Establishing Subscriber Sessions—Configurations are done to set up one or more logical sessions, from
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authorization, and accounting functions. For details, see
Accounting Functions, on page
specific events occur. The instructions for the action are provided in a policy map. For details, see
Activating Control Policy, on page
the subscriber to the network, for accessing broadband services. Each session is uniquely tracked and
managed. For details, see Establishing Subscriber Sessions, on page
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide, Release
Configuring Authentication, Authorization, and
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BNG Configuration Process
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