Section 10. Establishing Frame Relay Connections

Frame Relay is a connection-oriented Layer 2 protocol that allows several data connections (virtual circuits) to be multiplexed onto a single physical link. Frame Relay relies on upper-layer protocols for error correction. Frame Relay specifies only the connection between a router and a service provider’s local access switching equipment.

A connection identifier maps packets to outbound ports on the service provider’s switch. When the switch receives a frame, a lookup table maps the frame to the correct outbound port. The entire path to the destination is determined before the frame is sent.

Frame Relay Stack

As Figure 10-1 shows, the bulk of Frame Relay functions exist at the lower two layers ...

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