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I have the same issue, also I would like add that after I perform the phase 1 where I have both the links UP and perform the mutual redistribution, I noticed on my CORE# that when I do a show eigrp topology 192.168.1.0, It only shows the path from the primary link.
then I perform the phase 2 and 3, after that my CORE router was able to learn the routes on both links.
I'm not sure why it doesn't learn the routes from the backup link on phase 1 but it learns the route on phase 2 .
Very good , very helpful Knowlwdge base article.
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