Frame Relay is a Non-Broadcast Multi-Access (NBMA) technology. This means that you have to deal with address resolution issues, except in situations where you use Point-to-Point interfaces. The local Layer 2 addresses in Frame Relay are called Data Link Connection Identifiers (DLCI) and these are only locally significant. For example, in a hub-and-spoke environment, the hub device should have a unique DLCI to communicate to each of its spokes, as illustrated in Figure 16.6 below:
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