Imagine I have the following:
Let's say that due to a misconfiguration, 172.16.1.0/24 is not being advertised on CorporateRouter2.
So both Corporate Routers connected to the branch office EIGRP-Stub routers.
Let's say CorporateRouter1 dies for good. Since we have a stub configured on EIGRP-STUB-BranchRouter, the branch router will not query CorporateRouter2 in order to learn route 172.16.1.0/24 no matter what, right?
Are you sure about this? I have a different experience and the debug eigrp packet update query reply confirms that: while a stub router routinely answers with destination unreachable to all queries, the stub functionality does not prevent it from sending queries itself.
I could provide some debugs here but I don't want to do it right now. I'd like to just highlight another thread where this topic was also discussed: