The router supports IP over ATM PVCs on ATM line modules. This support allows service providers to receive traffic from subscribers who have CPE equipment, such as routers with ATM interfaces, to take in traffic from other network devices that use ATM, such as DSLAMs, and to connect to service providers with ATM backbone structures.
Figure 12 shows an IP/ATM access connection.
Figure 12: E-series Router IP/ATM Access Connection
Figure 13 shows the structure of the ATM interface. For ATM, this can be SONET, DS3, or E3 as supported by the different line modules. The major ATM interface sits on top of the SONET/DS3/E3 resource, and the subinterfaces sit on top of the major interface. The ATM subinterfaces connect to the IP interface layer.
Figure 13: Structure of the ATM Interface Design
Figure 14 shows the structure of the ATM protocols. The physical layer (SONET and/or DSx/Ex) is the foundation and provider of layer 1 framing service. The ATM layer is on top and provides cell, circuit, and OAM services. The AAL5 layer provides a frame-oriented interface to the ATM layer. The integrated local management interface (ILMI) provides local management across the UNI.
Figure 14: Structure of ATM Protocol
Figure 15 shows sample configuration parameters for a typical ATM interface configuration.
Figure 15: ATM Interface Configuration Parameters
The following sample command sequence configures an ATM interface on port 0 of the line module in slot 1. See JUNOSe Link Layer Configuration Guide, for information about how to configure an ATM interface.
- host1(config)#interface atm 0/1
- host1(config-if)#interface atm 0/1.22
- host1(config-if)#atm pvc 22 100 10 aal5snap
- host1(config-subif)#ip address 192.32.10.20
255.255.255.0
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