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Interfaces

The term interfaces is used in a very specific way in the JUNOSe CLI and this documentation. Interfaces are both physical and logical channels on the router that define how data is transmitted to and received from lower layers in the protocol stack. Conceptually, you configure an interface as part of the physical layer, layer 1.

For example, you can configure the physical and logical characteristics of T3 and T1 lines coming directly from the customer premises or from a central office switch and OC3 lines going out to the core of your network infrastructure. These physical and logical characteristics define an interface.

Interface layering must always be configured in order from the lowest layer to the highest layer. For example, if you have already configured IP to run over ATM and you want to reconfigure the interface to run IP over PPP over ATM, you must first remove the IP interface, apply PPP, and then reapply IP.

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