Layer 2 and Layer 3 VPNs require a routing policy that describes which packets are sent and received across the VPN. Layer 2 circuits do not use a policy, and therefore, Layer 2 circuits send and receive all packets. For Layer 2 VPNs, the routing policy resides on the PE Services Routers. For the Layer 3 VPN example, the routing policy resides on the CE Services Routers.
This section contains the following topics. For more information about configuring routing policies, see Configuring Routing Policies and the JUNOS Routing Protocols Configuration Guide.