Other Interfaces
Cisco supports a whole slew of different interface types: HSSI, DSL, FDDI, SMDS, and ATM, to name a few. If you need one of these interfaces, the interface card or router will come with documentation describing how the interface is configured. Chances are good that the configuration process will closely resemble the one used for serial or Ethernet circuits, with minor changes for the connection protocol. Because these interfaces are comparatively rare among the people likely to read this book, we're not going to cover them in any detail.
However, every router has two other sorts of interfaces that we will address: loopback and null interfaces. Both are logical interfaces—they have no hardware associated with them but are created ...
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