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Inter-AS Overlay Tunnel For a given MVPN, each AS independently builds an intra-AS tunnel In addition, an “overlay tunnel” that spans multiple ASes is built Each PE announces its MVPN membership info to the ASBRs with iBGP An ASBR announces the AS MVPN membership to other ASBRs (in other ASes) using eBGP This enables an AS-level spanning tree to be built among the set of ASes with members in this MVPN Inter-AS tunnels spliced to intra-AS tunnels |