I'm trying to understand BGP conferdations much better (the Cisco BGP case studies does not answer all my questions). The attached diagram and configs are froma lab I set up to try and understand how a confederation works. My problem is that router 4 has an EBGP session to R5, these routes are then passed on via an iBGP peering to R3, however R3 does not pass these onwards to R1. If I try to mesh the sessions i.e iBGP via confederation to R1 the session will not come active, trying to peer to both the loopback and the physical interfaces will not work.. Its like the router thinks its an EBGP connection without EBGP multihop configured. I did try to put neighbour 188.8.131.52 ebgp-multihop 5 in and the sessions will still not come up.
Can anyone help with my understanding or lack of?
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