DLSw enables you to allow SNA clients to communicate with SNA applications on a mainframe through an IP network. The IP network between an SNA client and an SNA application becomes transparent with DLSw. DLSw is configured on peer IP routers.
A DLSw connection is a Transport Control Protocol (TCP) connection that carries control and information frames between two DLSw peers within the IP network. After a connection is established, a DLSw circuit can be created for transporting SNA traffic.