L3VPN, As part of resolving some interoperability issues between Juniper and another vendor for the MDT SAFI while using the Constrained Route Target distribution mechanism (rt-constrain, RFC 4684), it was noted that the behavior of rt-constrain while being used on "VPN" routes with no Route Targets was not specified.
The behavior thus observed was that when rt-constrain was present, routes lacking RTs may not be distributed. This behavior would impact the Global Table Multicast feature. I started a thread on IDR to discuss this issue: http://www.ietf.org/mail-archive/web/idr/current/msg13162.html The thread somewhat abruptly ends since the participants decided to iterate a bit less publicly. A clarification Internet-Draft will likey result prior to the upcoming IETF session in Toronto. However, in the mean-time, please be aware of this issue and its presence in various vendors and thus its impact on this proposal. -- Jeff
