IP Connectivity Fix ~8 min · 3-device
Area 1 never talks to the backbone
R1 is the ABR. Its backbone link Gi0/0 (area 0, to R2) is FULL. The area-1 link Gi0/1 (to R3) never becomes a neighbor: R1 accidentally advertised the LAN in area 2, but R3 expects area 1. Fix the area mismatch, two valid ways.
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