But I fear there so far the idea hasn't gotten much traction. In fact, the
RFC4798 predecessor documents [1] included ability to set up tunnels over
GRE and similar non-MPLS encapsulations. This was explicitly _removed_
because the solution was targeted at MPLS networks, not as a general purpose
BGP-signalled tunneling mechanism.
[1] take a look at e.g:
http://tools.ietf.org/html/draft-ooms-v6ops-bgp-tunnel-00
I thought 6PE and BGP tunnelling got split into separate documents?
obviously my memory isn't serving me right.
you can still do BGP tunnelling with existing mechanisms. PEs are
connected through a full mesh of BGP peerings. each PE has an
automatic tunnelling interface (6to4, automatic tunnelling). BGP
next-hops are the 6to4/v4compatible address. note that 6to4 is only
used internally and the sites connecting to the PE uses native
addresses.