Figure 2: B-RAS Application
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.
Layered Approach
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
6 ■ Layered Approach
JUNOSe 11.1.x System Basics Configuration Guide
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