iBGP Basic config

 router bgp 65110
   bgp router-id 33.33.33.33
   network 10.108.1.0 mask 255.255.255.0
   neighbor 22.22.22.22 remote-as 65110
   neighbor 22.22.22.22 update-source Loopback0
   no auto-summary
   no sync

• The BGP router-id must be the same as the OSPF router-id for redistribution with OSPF to work.
• It's better to use the loopback address for the iBGP neighbor.
• It needs to advertise something that is already in the routing table, including the network mask, unless you use the no sync command.
• 22.22.22.22 is the loopback0 of the other router.
• The neighbor address must be pingable.
• The loopback address 22.22.22.22 must be pingable through the routing table, and not through the default route.