Terms; Network Model For Dial-Out; Figure 10: Network Model For Dial-Out; Table 73: L2Tp Dial-Out Terms - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide

Figure 10: Network Model for Dial-Out

Terms

Network Model for Dial-Out

402
NOTE: The dial-out feature exists in the LNS only. It does not exist in the LAC.
Table 73 on page 402 describes key terms used in L2TP dial-out.

Table 73: L2TP Dial-Out Terms

Term Description
Dial-out trigger IP packet that initiates a dial-out session
Dial-out session Control entity for a triggered IP flow used to manage the establishment of
an associated L2TP session for dial-out
Dial-out target A virtual router context and an IP address prefix, for which the arrival of an
IP packet (a dial-out trigger) initiates a dial-out session.
Dial-out route Contains the dial-out target, as well as a domain name and profile.
The domain name is used in the initial Access-Request message.
The profile is used to create the IP/Point-to-Point Protocol (PPP) stack
for the dial-out session.
In Figure 10 on page 402, the home site connects to the Internet over a permanent leased
line to the Internet service provider's (ISP's) E Series LNS. The ISP uses an IP network to
connect the LNS to the narrowband access point of the network where the narrowband
LAC exists. The narrowband LAC connects to a narrowband network (ISDN) that the
remote site is also connected to.
The figure shows three RADIUS servers. The home site maintains the home server, and
the other two servers are at the LNS and the LAC. The router accesses the home and
LNS RADIUS servers. (The separation of the RADIUS servers is transparent to the router.)
Before any attempts at connectivity can take place from the home site to the remote
site, an administrator must configure a dial-out route on the router. This route directs the
router to start a dial-out operation. The route includes a dial-out target (the virtual router
context and the IP address of the remote site). When the router receives a packet destined
for the target, it triggers a dial-out session to the target. The route is associated with a
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