9.6 Practical BGP Design Example
9.6.2 Problem 1
The next hop for these entries, 128.213.63.2, is unreachable because we do not have a way to reach that next hop via our IGP (OSPF). RTB has not learned about 128.213.63.0 via OSPF. We can run OSPF on RTA s0 and make it passive, and this way RTB would know how to reach the next-hop 128.213.63.2. We could also change the next hop by using the bgp nexthopself command between RTA and RTB.

Note: Click on topology to view command outputs.

Note that all the entries have >, meaning that BGP is ok with next hop. Now consider the routing table: