Frame Relay Overview
Frame Relay is an industry-standard, switched data link layer protocol that is capable of handling multiple virtual circuits (VCs) using High-Level Data Link Control (HDLC) encapsulation between Frame Relay–capable devices. Figure 5-1 illustrates an ANSI T1.618 Frame Relay frame.
Figure 5-1. The Frame Relay Format
The nine fields of the Frame Relay frame are as follows:
Flag— Used to identify the beginning and end of the frame.
Data-Link Connection Identifier (DLCI)— Identifies the path through the network to a specific destination.
Command/Response (C/R)— Not generally used.
Extended Address (EA)— Identifies whether the ...
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