Task reqs are:
•In order to help manage this problem while the source of the topology
changes is found configure routers in the EIGRP domain to wait up to 5
minutes for a response to an EIGRP query message.
the solution is:
router eigrp 10
timers active-time 5
the quote from well-known resource:
In EIGRP, there are timers that control the time the router waits
(after sending a query) before declaring the route to be in the stuck in active (SIA) state.
I'm embarrassed a little bit.