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Cloned from launchpad blueprint https://blueprints.launchpad.net/neutron/+spec/l2-gateway. Description: Neutron core currently has one mechanism to connect VMs in Networks to bare-metal servers in a physical L2 segment: the Provider Network extension. This model has some limitations that were already tackled by the NVP’s Layer-2 Gateway vendor extension. The NVP implementation has the following advantages: 1) It explicitly models the L2GW as an entity in the network. The Provider can create several L2GW objects and a Tenant can explicitly connect a network to a specific L2GW. 2) No assumption is made on the location of the external network, which may not be directly reachable from the hosts where the VMs are deployed 3) A network can be connected to multiple L2 Gateways NVP’s Layer-2 Gateway is currently a vendor extension, the goal of this blueprint is to add a L2GW capability as a core extension. Specification URL (additional information): https://docs.google.com/document/d/1RZq6UjTGzHBgQbbuCR8KrqUZZdy2RQHNlr6i5xAOozg/edit?usp=sharing