Internetworking connectionless and connection-oriented networks

Malathi Veeraraghavan Mark Karol Polytechnic University Lucent Technologies 6 Metrotech Center 101 Crawfords Corner Road Brooklyn, NY 11201 Holmdel, NJ 07733 [email protected] [email protected] ABSTRACT: The use of connection-oriented (CO) networks for the transport of IP traffic is seen to have value to both users and service providers. Given the expectation that most endpoint-generated traffic will be in the form of connectionless (CL) IP datagrams, we address the problem of how to internetwork a CL (IP) network with a CO network. CO networks can be packet-switched or circuit-switched. Examples of packet-switched CO networks include Asynchronous Transfer Mode (ATM) and MultiProtocol Label Switching (MPLS) networks, in which resource reservations are made at the ATM or shim layer, and IP switch based networks, in which resource reservations are made at the IP layer. Examples of circuit-switched networks include Synchronous Optical NETwork/Synchronous Digital Hierarchy (SONET/SDH) networks and Wavelength Division Multiplexed (WDM) networks that consist of programmable optical crossconnects. We consider the internetworking problem for two modes of operation of CO networks: provisioned, in which connections are set up a priori, and switched, in which connections are set up on demand. The main focus of this paper is on the more complex problem, i.e., the internetworking of CL IP networks with CO networks operated in a switched mode. Our solution consists of (i) interworking user-plane protocols with protocol conversion in some cases instead of always using protocol encapsulation, (ii) interworking routing protocols by either simply having gateways know routing information of both networks or having all nodes know routing information of both networks, and (iii) interworking signaling protocols by using applicationor transport-layer end-to-end handshakes to trigger connection setups through the CO network. We demonstrate throughput improvements with our integrated routing interworking scheme over the MPOA IP-ATM internetworking solution for two example networks.