The logs show that the routes are being learnt/ removed because of a config change
callbackup_routes means at some point, EIGRP attempted to install routes to the destinations and failed, most commonly because of the existence of a route with a better administrative distance.
When this occurs, EIGRP registers its route as a backup route. When the better route disappears from the routing table, EIGRP is called back through callbackup_routes so that it can attempt to reinstall the routes that it is holding in the topology table.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...