Today I would like to test EIGRP optimalization by using different features like summarization or stub to see what are the limitations we should be aware of. We have 4 sites with one access router on every site. There are 5 subnets connected to every access device and every device can see all prefixes: Below you can see routing table from R1, R3 and R5 as it will be the same logic on rest of them: R1#sh ip route eigrp Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - ...