I believe you were referring to OSPF as the IGP, not the internal BGP as that is another routing protocol altogether :)
If you don't want to create adjacencies between routers running OSPF while having OSPF enabled in the router, you can use passive-interface command under the OSPF routing process referring to the interfaces connected to the unwanted neighbors.
There are times when you need to enable OSPF in a router and you want to make sure a certain interface does not send or receive OSPF hello packets. In that case, the passive-interface command will prevent that interface from establishing adjacency to/from unwanted neighbors.
As for the 2nd question, I really don't understand what you are asking.
For eBGP to work, it needs reachability to its neighbor. If its neighbor is directly connected, you don't need an IGP such as OSPF. If the neighbor is multiple hops away or you are peering with loopbacks, then you need an IGP to know how to get there.
Thanks for your reply...We're peering with the interface addresses as opposed to the loopbacks as the neighbors are multiple hops away and are in different AS'es...We're using OSPF for the reachability to the neighbors and I was just wondering if we have to create ajacencies between them for OSPF to function properly..
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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