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Today I review my OSPF notes and I'd like to share below pdf, I think it can be useful to understand what is the impact on the reachability between nodes when we change area type.

This is the second part of 'EIGRP - routing optimalization' series. Before reading this one, please review part 1 availab le here . This is the network and as I said in part 1 I'm going to enable 'stub' feature to see what is the impact and how EIGRP works: R5(config-router)# R5(config-router)#router eigrp 100 R5(config-router)#eigrp stub R5(config-router)# The same configuration I add to R6, R9 and R10. The test I'm going to perform is the same from previous post. I shutdown 10.5.2.0/24 network and I check the query scope. R5(config)#int loop2 R5(config-if)#sh R5(config-if)# R3# *Feb 19 23:47:06.411: DUAL: AS(100) rcvquery: 10.5.2.0/24 via 8.1.7.5 metric 72057594037927935/72057594037927935, RD is 156160 for tid 0 *Feb 19 23:47:06.411: EIGRP-IPv4(100): Find FS for dest 10.5.2.0/24. FD is 156160, RD is 156160 on tid 0 *Feb 19 23:47:06.415: EIGRP-IPv4(100):  8.1.7.5 metric 72057594037927935/72057594037927935 not found Dmin is 72057594037927935 *Feb 1

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 - per-user static route        o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP        + - replicated route, % - next hop override Gateway