To create dynamic interfaces over ATM, you create the static layers of the interface first, and then configure them to support a dynamic interface by means of autodetection. Figure 39 shows an example of the interface stack for a dynamic IP over ATM 1483 interface.
Figure 39: Configuring an ATM 1483 Interface to Support Dynamic Interfaces
On receipt of a packet, the router creates all dynamic layers above the ATM 1483 layer, starting with the lowest dynamic layer. For example, in the case of a dynamic PPPoE interface, the router creates the PPPoE interface first, then the PPP interface, and then the IP interface.
If any layer of the dynamic portion of the interface column fails to be created, then the interface creation fails and the connection is denied. All dynamic layers above the ATM 1483 subinterface are destroyed, starting with the highest dynamic layer.
When you configure a dynamic interface, you must assign (or create and assign) a profile to the interface. Profile creation and assignment topics are discussed in depth in Configuring a Dynamic Interface from a Profile .
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