The QBone Project Roch Guerin Dept. Elec. Eng. University of Pennsylvania

What is the QBone? n The QBone is the first large scale effort to deploy Quality-of-Service in IP networks u Quality-of-Service  Service differentiation, i.e., a qualitative rather than quantitative model n Based on emerging IETF Differentiated Services (Diff-Serv) standards u Standard defines only local guarantees (per hop behavior) l Expedited and Assured Forwarding

The Diff-Serv Model n Two basic components u Traffic conditioners at the edge mark (DS byte) packets according to the service they are eligible for u Routers enforce different levels of service based on DS byte value n Extensions u Fine grain edge classification and policy decisions u Bandwidth brokers classification conditioning marking classification conditioning marking differentiated packet handling

Initial QBone Service n Emulation of Virtual Leased Line u Fixed bandwidth guarantee (no more, no less) u Traffic conditioning based on token bucket with small (one or two packets) burst tolerance n Rudimentary checking at edge routers u Policing for conformance with rate guarantee l Excess packets are dropped n Semi-static configuration u Manual provisioning of resources in backbone u Fixed set of source and destination addresses

Current QBone Configuration

UPenn QBone Effort n Project participants u Magda El Zarki u Roch Guerin u Shumon Huque u Deke Kassabian u Jonathan Smith u Ira Winston n Project Information  UPenn page: u QBone page:

UPenn QBone Effort n Two main themes  Application use of QBone services  Flexible configuration of edge devices n Application use u Service selection and parameters u Impact of policing u Coordination of resource allocation across streams n Configuring edge devices u Packet classification based on policies u Stateful resource sharing u Active resource management

UPenn Local QBone Connectivity MAGPI Gateway To MAGPI (and QBone) edge device (type 2) edge device (type 1) edge device (type 1) end-systems PennNet Types of edge devices l 3COM CoreBuilder 3500 l Lucent Packet Star l IBM 2213 edge router

PennNet MAGPI Abilene vBNS PennNet Research testbed PennNet University of Pennsylvania MAGPI Gateway QBone Overall QBone Connectivity

Stateful Packet Classifier Scheduler Switch Egress Conditioners Scheduler State Sharing Ingress Conditioners Scheduler s1s1 s2s2 s3s3 snsn 123 Some Details on Edge Configuration Issues