Layer 1 Issues on the Access Link (Step 1)
If a router’s physical interface used for the Frame Relay access link is not in an “up and up” state, the router cannot send any frames over the link. If the interface has a line status (the first interface status code) of down, the interface most likely has a Layer 1 issue.
From a Layer 1 perspective, a Frame Relay access link is merely a leased line between a router and a Frame Relay switch. As such, the exact same Layer 1 issues exist for this link as for a point-to-point leased line. Because the possible root causes and suggested troubleshooting steps mirror what should be done on a leased line, refer to the section “Troubleshooting Layer 1 Problems” in Chapter 12, “Implementing Point-to-Point WANs ...
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