Moving Interfaces; Preventing Ip Spoofing; Routing Protocols; Policies And Qos - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

Moving Interfaces

Preventing IP Spoofing

Routing Protocols

Policies and QoS

Applications

Copyright © 2010, Juniper Networks, Inc.
A shared IP interface that has associated subscriber demultiplexing attributes retains
these attributes when it moves.
For details about moving shared IP interfaces, see the Moving IP Interfaces section in
JunosE IP, IPv6, and IGP Configuration Guide .
You can prevent IP spoofing on subscriber interfaces by using media access control
(MAC) address validation.
For information about configuring MAC address validation, see the MAC Address Validation
section in JunosE IP, IPv6, and IGP Configuration Guide.
For information about the relationship between the MAC address validation state and
dynamically created subscriber interfaces, see "Inheritance of MAC Address Validation
State for Dynamic Subscriber Interfaces" on page 595.
You configure unicast routing protocols on subscriber interfaces in the same way that
you configure routing protocols on primary IP interfaces, provided that you configure
them to use unicast addressing when communicating with a peer. You can also enable
multicast routing protocols such as IGMP on subscriber interfaces; however, we do not
recommend this type of configuration.
You can configure policies, such as rate limiting and filtering, and quality of service (QoS)
for subscriber interfaces in the same way that you do for primary IP interfaces. For more
information, see the JunosE Policy Management Configuration Guide and the JunosE Quality
of Service Configuration Guide.
In a cable modem network, service providers can use subscriber interfaces to:
Direct traffic toward special local content in the network
Differentiate traffic for virtual private networks (VPNs)

Directing Traffic Toward Special Local Content

Figure 19 on page 590 shows an example of a cable modem network. Multiple cable
modem termination systems (CMTSs) connect to multiple shared media access LANs.
Many subscribers connect to each LAN.
In this example, the service provider uses subscriber interfaces to direct traffic toward
special local content on the network: a voice over Internet Protocol (VoIP) service on
network 10.11.0.0/16, or a local gaming service on network 10.12.0.0/16. Rate limits and
policies on the subscriber interface customize the service level for the associated service.
Chapter 25: Configuring Subscriber Interfaces
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