Provisioning differentiated services using programming interfaces for networks

The IETF Differentiated Service (DiffServ) effort aims to create a scaleabl e framework for realizing traffic differentiation in IP networks. At presen t, the framework has laid the ground for architecting routers that provide basic functionalities to support traffic differentiation. How these DiffSer v-enabled routers can be put together to form a service network is not mand ated by the framework. The open signaling approach, originally proposed for ATM networks defines programming interfaces for switches and routers, End to end services can be created by programming the routers via the standard interfaces using simple signaling mechanisms. This leads to flexible servic e creation and co-operative behavior of multiple routers in a network, In t his paper, we present a behavioral abstraction called virtual link for IP p acket forwarding engines. The virtual link abstraction and open signaling a re used for provisioning Differentiated Services. The work described herein has been submitted in part, as a contribution to the IEEE P1520.3 working group for standardizing programming interfaces for networks. Implementation experience of the proposed interfaces is presented.