BGP - routing table entry without exit interface
BGP routes that appear in the routing table of a Cisco IOS Layer 3 device will never have an exit interface as part of their entry. They will always have a next hop IP address.
To determine the exit interface, recursive routing is always employed. This is why a BGP route will only appear in the routing table if there is a valid route to the next hop IP.
Links
https://forum.networklessons.com/t/dmvpn-phase-1-bgp-routing/1305/49?u=lagapides