Hello, I want to know how iBGP manipulates OSPF routes to R2 loopback to go via R4 when the link between R1 and R2 goes down. Here I am establishing iBGP neighborship using loopbacks. I have shut down the fa0/0 interface of R1.
Thanks to your ospf, acting as an underlay, you still get path to R2's loopback via R4. Then iBGP session beween R1 and R2, based on loopback routed via ospf, is always established.
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