Routing Loop
First capture a “show ip route” from the threeproblem routers
R3 is forwarding traffic to 1.1.1.1 (R1)
R3# show ip route 10.1.1.1
Routing entry for 10.0.0.0/8
Known via "bgp 65000", distance 200, metric 0
Routing Descriptor Blocks:
1.1.1.1, from 5.5.5.5, 01:46:43 ago
Route metric is 0, traffic share count is 1
AS Hops 0, BGP network version 0
* 1.1.1.1, from 4.4.4.4, 01:46:43 ago
Route metric is 0, traffic share count is 1
AS Hops 0, BGP network version 0