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With the worldwide success of IP-MPLS  networks deployment, inter-connecting multiple provider IP-MPLS networks for global reachability becomes the next important step. Many providers have implemented MPLS interprovider connections. In this article we first briefly describe the drivers behind the need of interprovider IP-MPLS services, such as layer 3 VPNs , pseudowire emulation for transporting layer 2 traffic over IP-MPLS, VoIP, and others. We then discuss the general requirements fordoi:10.1109/mcom.2005.1452840 fatcat:3foktqsorndlvlzqj6z2g37s7m