1. A method for advertising and interoperating an L2VPN service from an access node to a core network node, the method comprising: executing, using one or more processors, a routing protocol on an access node to establish adjacency with a core network node in an access mode; mapping, using the one or more processors, an access network Layer 2 service identifier to a core network service identifier; advertising, using the one or more processors, a mapping for the L2VPN service to the core network node; and sending, using the one or more processors, network traffic from the access node to the core network node without core network encapsulation.