VPRN (Virtual Private Routed Network) is a Multipoint-to-Multiponit Layer 3 VPN Service that connects multiple branches in a single logical routed architecture over IP/MPLS network of a Service Provider. This is called Layer 3 VPN generally, but Alcatel-Lucent define this Layer 3 VPN as VPRN (Virtual Private Routed Network).
Different branches of a customer, pass through the IP/MPLS network of Service Provider and this Layer 3 VPN infrastructure seems to the customer as their branches are connected to a single company Router. Many different customer networks exist in this IP/MPLS network. And these are managed by Service Provider.
Each of the customer in IP/MPLS network does not know the other network and use the Service Provider managed IP/MPLS network as their own. This provides independence to the customer and efficient usage of network to the Service Provider.
With VPRN, multiple sites of the customer can connect over the IP/MPLS Network of Service Provider. So, from the customer perspective, the sites are connected to a Router.
