EIGRP Challenge Lab

I did my best to get through all of the tasks for the EIGRP Challenge Lab but I was unable to complete two tasks because I wasn't sure what they we really wanting me to do. The first was to filter a specific network from advertising out of a routers interface. The other task was to filter a network from entering a routers interface. I wasn't sure if I was just supposed summarize the network or create access-lists, route-maps, etc to deny the traffic. Besides that I managed to finish every other task successfully.

I had to change EIGRP settings such as manual summarization, change hello timers, and implement MD5 authentication which was all pretty straight forward. The weirdest task preventing EIGRP from sending multicast updates between the neighbors R1 and R2 (As shown above). I think I figured it out by entering the following command under my EIGRP AS 1

Router 1
router eigrp 1
neighbor 172.16.12.2 s0/0

Router2
router eigrp 1
neighbor 172.16.12.1 s0/0

If any one has any better suggestions on how to limit multicast addresses or if my method was completely wrong, please let me know haha!