BGP confuesion

[M.Sultan]

Look the diagram below !

Ospf is full meshed as underlaying and all physical interfaces added to ospf routing domain, and then applied iBGP using loopback interfaces of each router, and eBGP using physical interface of each connected router, now from R12 I see only routes loopback interfaces, and from R12 i can ping all loopbacks but not the physical interfaces which was added to ospf.

What is wrong ?

 Do I need add all physical interfaces into ibgp ? or i do redistribution ? I'm confused !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[MHM Cisco World]

we are talking about this part of your topology 
there is iBGP mesh between R5 R6 R7 and R8

[M.Sultan]

Oh I see no need for redistribution because i can ping all routers due to full mesh!

[MHM Cisco World · Accepted solution]

so steps need to make full mesh work 
config iBGP between all router 
add interface between routers (and LO if you use it as update source) to OSPF 
config iBGP

next-hop

self 
that it 
each router Now know the

next-hop

for any prefix advertise via iBGP

if you dont config full mesh you need to redistrubte the iBGP prefix into OSPF
hope this clear this topic 
thanks 

MHM