Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

Page: 643 / 788

Differentiating Traffic for VPNs
Similarly, service providers can use subscriber interfaces to differentiate traffic for
VPNs. Figure 20 on page 603 shows an example of this application.
Customers on subnet A need to connect to VPN A, and customers on subnet B need
to connect to VPN B. The E Series router connects to VPN A through virtual router A
and to VPN B though virtual router B. Using two subscriber interfaces on the same
primary interface (one on virtual router B and one on virtual router A), the E Series
router can separate the traffic from subnets A and B. Because the E Series router is
forwarding traffic in this application, the shared IP interface should demultiplex the
traffic by using a source address.
Figure 20: Associating Subnets with a VPN Using Subscriber Interfaces
E Series router
For instructions on configuring the application shown in Figure 20 on page 603, see
“Using a Source Address to Demultiplex Traffic” on page 611.
Subscriber Interfaces Platform Considerations
For information about modules that support subscriber interfaces on the ERX7xx
models, ERX14xx models, and the ERX310 Broadband Services Router:
Subscriber Interfaces Platform Considerations
■ 603
Chapter 25: Configuring Subscriber Interfaces