Layered Approach; Figure 2: B-Ras Application - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SYSTEM BASICS CONFIGURATION GUIDE 2010-10-04 Configuration Manual

JunosE 11.3.x System Basics Configuration Guide

Figure 2: B-RAS Application

Layered Approach

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The router then performs several functions:
PPP session termination and authentication checking through PAP or CHAP
Coordination with DHCP servers and local IP pools to assign IP addresses
Connection to RADIUS servers or use of domain names to associate subscribers with
user profile information
Support for RADIUS accounting to gather detailed billing information
Application of the user profile to the user traffic flow, which could include QoS, VPN,
and routing profiles
The output of the router is typically a high-speed link, such as OC3/STM1 to feed a core
backbone router. Virtual routers can also be used to keep the traffic logically separate
and to direct packets to different destinations. As shown in Figure 2 on page 6, the
packets can be directed to a CLEC, ISP, corporate VPN, or the Internet.
A large number of xDSL protocols are supported, including:
IP/PPP/ATM
IP/PPP/Ethernet/ATM
IP/bridged Ethernet/ATM
See JunosE Broadband Access Configuration Guide, for information about configuring
B-RAS.
The JunosE CLI enables you to configure your network based on the hierarchy of the OSI
model. Therefore, the JunosE configuration guides use a bottom-up approach to describe
the configuration process. Figure 3 on page 7 shows the relationship of layers, protocols,
and interfaces to the configuration process. Software functions are layered on top of
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