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.
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I perhaps not understand your need so sorry.
You seem to have configured OSPF to route Routers' loopback and you configure iBGP based on these loopback.
Then when the link between R1 and R2 goes down, R1 loopback is known via R4. IBGP does not manipulate OSPF routes.
I have established neighborship between all routers using their loopback and for the connectivity to loopback, I have used OSPF.
Now when I shut down the link between R1 and R2 the routes to R2 loopback from R1 via R4. I want to know how did this happen?
Hello @KKZ ,
iBGP sessions are not limited to TTL =1 like a standard eBGP session does. By using iBGP sessions on loopbacks the iBGP session is able to survive the shutdown of R1 LAN port by using OSPF to reroute.
You can see iBGP like an application using OSPF IGP routing services.
Hope to help