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Inter-AS Procedures Second Model – Overlay Inter-AS Tunnel MVPN membership spanning tree rooted at the origin AS, with other ASs as nodes of the tree The overlay tunnel traverses this spanning tree Origin AS announces that it has a MVPN to other ASs – not the PEs that belong to the MVPN Each AS node on the spanning tree has its own intra-AS tunnel MVPN-tunnel binding flows towards the root of the overlay tree using BGP – essentially MPLS label switching at the ASBRs Support for S-PMSIs |