The BGP Encapsulation Subsequent Address Family Identifier (SAFI) and the BGP Tunnel Encapsulation Attribute
Note: This ballot was opened for revision 05 and is now closed.
(Jari Arkko) (was Discuss) Yes
The document says: For example, the path from R1 to R2 may be part of a "BGP-free core", where there are no BGP-distributed routes at all in the core. Reference defining the BGP-free core concept would be nice. Not sure if there is a suitable reference, though.