Routing Loop
R4 is also forwarding to 1.1.1.1 (R1)
R4# show ip route 10.1.1.1
Routing entry for 10.0.0.0/8
Known via "bgp 65001", distance 200, metric 0
Routing Descriptor Blocks:
* 1.1.1.1, from 5.5.5.5, 01:47:02 ago
Route metric is 0, traffic share count is 1
AS Hops 0