Juniper JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010, Configuration Manual

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For example, on an Ethernet VLAN, multiple subscribers can enter the network from
a Wi-Fi hotspot, as shown in Figure 17 on page 605:
Figure 17: Example of a Dynamic Subscriber Interface
To other locations
Service selection
Access point
subscriber xyz
subscriber abc
Cyber Cafe Main Street
Access point
subscriber 456
subscriber 123
Cyber Cafe Hill Street
L2 transport
L2 transport
ISP POP
Local provider
access network
ISP network
RADIUS
server
g017351
In Figure 17 on page 605, multiple subscribers share the same broadcast segment.
Each subscriber is identified by an individual IP address or a group of subscribers
can be identified with an IP network. When each subscriber is identified by an
individual IP address, a dynamic subscriber interface is created for each subscriber.
You can manage a group of subscribers identified with an IP network, on a single
DSI. You can also manage a group of subscribers using a static subscriber interface
(SSI). However, you must manually configure the SSI and you cannot use the same
dynamic profiles and RADIUS that DSIs use.
Subscribers can be connected to a single broadcast segment without using dynamic
or static subscriber interfaces. This configuration is useful when subscriber
management is not required. Subscriber management usually refers to (but is not
limited to) tailoring IP policies and QoS profiles to a specific address or a very small
group of addresses. For detailed information about the uses for Dynamic Subscriber
interfaces, see “Configuring Dynamic Subscriber Interfaces” on page 622.
Relationship to Shared IP Interfaces
A subscriber interface is an extension of a shared IP interface . A shared IP interface
is one of a group of IP interfaces that use the same layer 2 interface.
Shared IP interfaces are unidirectional—they can transmit but not receive traffic. In
contrast, subscriber interfaces are bidirectional—they can both receive and transmit
traffic.
For details about shared IP interfaces, see the Shared IP Interfaces section in JUNOSe
IP, IPv6, and IGP Configuration Guide .
Subscriber Interfaces Overview
■ 605
Chapter 25: Configuring Subscriber Interfaces