NEXT_HOP Reachability
AS 3
AS 12
AS 4
R1 and R2 advertise routes to R3 with NEXT_HOPs of 1.1.1.1 and 2.2.2.2
R3 must have a route to these two addresses
Black Holes and severe route flapping can occur if R3 does not have a proper route to both NEXT_HOPs
1.1.1.1
2.2.2.2
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