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 39.
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 46 shows the protocol layers that represent the IPoA interface columns, and the layers within the interface columns that are static and dynamic.
Figure 46: 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.
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