In current RFC4364 deployments, when BGP is used as
the PE-CE routing protocol, BGP peering sessions are
typically configured as an external peering between the
VPN provider AS and the customer network AS.
While this technique works well in situations where there
are no BGP routing exchanges between the client network
and other networks, it does have drawbacks for customer
networks that use BGP internally for purposes other than
interaction between CE and PE routers.
In order to make the usage of BGP/MPLS VPN services
as transparent as possible to any external interaction,
it is desirable to define a mechanism by which PE-CE
routers can exchange BGP routes by means other than
This document specifies a means to use Internal
BGP for the purpose of exchanging PE-CE routes.
Working Group Summary
This document is a product of L3VPN WG. The document
underwent WG Last Call in both the L3VPN and IDR WGs.
The L3VPN WG is aware of two implementations.
Ben Niven-Jenkins is the Document Shepherd for this document
Stewart Bryant is the Responsible Area Director.