How does split-horizon in eigrp really works in my topology?
I have basic knowledge about what is split-horizon but not how it actually works.
Please refer to the topology below...
According to R1's "show ip eigrp topology all-links"
P 188.8.131.52/30, 1 successors, FD is 1310720, serno 75
via 184.108.40.206 (1310720/1308160), FastEthernet0/1
via 220.127.116.11 (1843200/1331200), Serial0/0/1
via 10.0.0.2 (2195456/1305600), Serial0/1/0
P 18.104.22.168/30, 1 successors, FD is 645120, serno 7
via 22.214.171.124 (645120/514560), FastEthernet0/1
via 126.96.36.199 (1052160/540160), Serial0/0/1
via 10.0.0.2 (2198016/1308160), Serial0/1/0
P 188.8.131.52/30, 1 successors, FD is 2565120, serno 80
via 184.108.40.206 (2565120/2562560), FastEthernet0/0
via 220.127.116.11 (2567680/2565120), FastEthernet0/1
via 18.104.22.168 (3100160/2588160), Serial0/0/1
via 10.0.0.2 (3100160/2588160), Serial0/1/0
P 172.30.20.0/30, 1 successors, FD is 773120, serno 77
via 22.214.171.124 (773120/642560), FastEthernet0/1
via 126.96.36.199 (985600/409600), Serial0/0/1
via 10.0.0.2 (2323456/1433600), Serial0/1/0
P 188.8.131.52/30, 1 successors, FD is 670720, serno 76
via 184.108.40.206 (670720/540160), FastEthernet0/1
via 220.127.116.11 (857600/281600), Serial0/0/1
via 10.0.0.2 (2221056/1331200), Serial0/1/0
As you can see, R1 has three routes to reach all networks except for network 18.104.22.168 which has four routes. So, R3 is not advertising routes to R1 except for its connected networks. I understand the reason that R1 doesn't have four routes to each network is due to the split-horizon effect.
I want to understand why network 22.214.171.124 is the one that got all four routes. Why not network 126.96.36.199 for example? In other words, how does split-horizon works in this topology. (step by step would be appreciated )
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