Juniper JUNOSE 11.2, Configuration Manual

Page: 582 / 772

Configuring IPoA Dynamic Interfaces
E Series routers support dynamic IP over ATM (IPoA) interfaces. An IPoA interface is IP
over ATM 1483 over ATM AAL5 over ATM. See Figure 46 on page 518.
An IPoA configuration is typically used as a high-speed access service or uplink to another
router. A common use is to provision IP over ATM circuits over DSL to connect businesses
to the Internet—a B-RAS alternative to circuit aggregation. All provisioning can be through
the RADIUS server to minimize any configuration of the router.
When IP packets are received over ATM circuits, the IP interfaces are dynamically
constructed over the corresponding ATM 1483 interfaces from the configuration data
received from the RADIUS server, a profile, or both.
Figure 54 on page 550 shows the protocol layers that represent the IPoA interface columns,
and the layers within the interface columns that are static and dynamic.
Figure 54: Dynamic IPoA over Static ATM 1483 Interface Columns
When you configure dynamic IPoA interfaces, you must assign a profile. Optionally, you
can also assign a subscriber identification.
Configuring a Dynamic IPoA Interface
To configure dynamic IPoA interfaces:
1.
Configure a physical interface.
host1(config)# interface atm 5/0
2.
Configure an ATM subinterface.
host1(config-if)# interface atm 5/0.1
3.
Configure a PVC by specifying the VCD, the VPI, the VCI, and the encapsulation type.
If you want the router to autodetect the encapsulation type, use the aal5autoconfig
option.
host1(config-subif)# atm pvc 10 100 22 aal5snap
host1(config-subif)# atm pvc 10 100 22 aal5autoconfig
4.
Assign a profile.
Copyright © 2010, Juniper Networks, Inc. 550
JunosE 11.2.x Link Layer Configuration Guide