Perhaps you mean Carrier supporting Carrier? This is whereby an ISP has geographically disparate sites and uses another ISP to interconnect them. Here there is a hierarchy of VPNs whereby one ISP has end VPN customers but is in itself an end VPN customer of the transporting ISP, so one VPN is in essence inside the other - make sense?
Harold Ritter Sr Technical Leader CCIE 4168 (R&S, SP) harold@cisco.com México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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