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 layered on top of
Copyright © 2010, Juniper Networks, Inc.
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