Abstract: A method, system, and computer program product for enabling communication between different overlay solutions. The method includes one or more processor obtaining an address resolution request from a first resource in a first domain for a second resource in a second domain. Both domains are in a shared computing environment and the second domain includes a control plane engine. The one or more processor obtains source information from the request, registers the information to the engine, and utilizes the request to query the engine to locate the second resource in the domain. The second resource matches the request. The processor receives a response from the engine identifying a first host and the first host is in the second domain and is the host of the second resource. The processor sends a notification request to the first host requesting that the first host reply to the request.

Abstract: In an approach to routing and forwarding a data packet with a forwarding RBridge and a corresponding RBridge, a computer, in response to receiving a TRILL data packet, performs the following steps: parsing a TRILL header of the TRILL data packet, and acquiring an egress RBridge nickname of the TRILL data packet; obtaining routing information corresponding to the egress RBridge nickname, wherein the information indicates whether the forwarding RBridge is the penultimate hop RBridge on the forwarding path to which the egress RBridge nickname is corresponding; and in response to the indication in the information that the forwarding RBridge is the penultimate hop RBridge on the forwarding path to which the egress RBridge nickname is corresponding, stripping the TRILL header of the TRILL data packet off to obtain an original data packet, and forwarding the original data packet to the egress RBridge from an out port specified by the information.