Route Oscillation – Step by step
AS 3
AS 12
AS 4
R3 naturally prefers routes from AS 12
R3 does not have an IGP route to 142.108.10.2 which is the next-hop for routes learned via AS 12
R3 learns 142.108.0.0/16 via AS 4 so 142.108.10.2 becomes reachable
142.108.10.2
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