Hello there,
Believe me or not but You are in fact receiving all 6 routes on R2:
root@R2# run show bgp summary Groups: 1 Peers: 1 Down peers: 0 Table Tot Paths Act Paths Suppressed History Damp State Pending inet.0 6 4 0 0 0 0 Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped... 10.0.3.4 65001 154381 2879 0 1 21:34:06 4/6/6/0
Only 4 out of 6 are "active" meaning only 4 make it to the route table. That's why You get only 4 lines when trying to count "192.168" routes on R4
2 out of total 6 are likely hidden - check "show route hidden detail" and verify if the protocol next-hops for these 2 are resolvable. Confederation members should be in common IGP domain.
HTH
Thx
Alex