Hello there :D
Here's what bothers me,.i'm so curious about it. I found that when setting eigrp, i don't need to put network mask. Like this:
(config)#router eigrp 1 (config-router)#network 10.1.1.0
and i should perform the following command to advertise it: router(config-if)#ip summary-address eigrp 1 10.1.1.0 255.255.255.0
why does eigrp work in this way ? Not using network mask on the router configuration gives some advantages ?