I try to simulate the case of using downbit check to prevent routing loop in OSPF/VPN environment. In my lab, I create a vrf Gi with two ospf area: one of 14 and another of 44. Now in R2 and R3 routing table of vrf Gi, we see route 192.168.0.0 is learnt through BGP with next-hop 172.16.0.6. It is what we expected.
R2#sh ip route vrf Gi
126.96.36.199/32 is subnetted, 1 subnets
O 100.100.100.100 [110/11] via 10.0.0.5, 00:59:13, Ethernet1/0
10.0.0.0/30 is subnetted, 2 subnets
O 10.0.0.0 [110/20] via 10.0.0.5, 00:59:13, Ethernet1/0
C 10.0.0.4 is directly connected, Ethernet1/0
192.168.0.0/30 is subnetted, 1 subnets
B 192.168.0.0 [200/0] via 172.16.0.6, 01:19:43
But when I try to ping from R2 to address 192.168.0.2, loop seems to happen. Packets go to R3, but after that R3 forwards them back to R1 while according to the theory, it should forward to R4 through BGP
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