This is due to the EIGRP default classful behaviour. The way this command works is that it first tries to find the classful match for a prefix. If there is no match then it will spit the above message : % Route not in topology table
So in your above example if you had 10.0.0.0/8 in the topology you would have definitely seen some output when you type the comand show ip eigrp topology 10.0.0.0.
In todays classless world you should always type this command with the specific mask. In other words if you type show ip eigrp topology 10.16.64.0 255.255.255.0 then you will see that it will show the details about 10.16.64.0/24 from the topology table. Similarly show ip eigrp topology 10.16.64.0 255.255.224.0 will show the topology details of 10.16.64.0/19.
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...