1. Router 1 had incorrectly configured Frame-relay mapping and its DTE interface had the clock-rate configured. The errors were fixed by correcting the Frame-relay map and removing the clock-rate from the DTE interface.
2. Router 2 had the clock-rate configured on its DTE interface, incorrect Frame-relay mapping, LMI configured as ANSI instead of Cisco, and no password on virtual lines. The errors were fixed by removing clock-rate, correcting Frame-relay map, changing LMI to Cisco, and adding a password to virtual lines.
3. The Frame-relay switch was missing the route from R2 DLCI 182 to R1 DLCI 181. This was fixed