Policy Enforcing for Probe BasedAdmission Control政策执行为基础的准入控制探讨.pptVIP

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Policy Enforcing for Probe BasedAdmission Control政策执行为基础的准入控制探讨.ppt

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Policy Enforcing for Probe BasedAdmission Control政策执行为基础的准入控制探讨

8 May 2002 Policy Enforcing for Probe Based Admission Control Master of Science Thesis Policy Enforcing for Probe Based Admission Control Policy Enforcing for Probe Based Admission Control Master of Science Thesis Royal Institute of Technology (KTH), Dept. Of Teleinformatics (IT)Stockholm, SwedenPolitecnico di Torino, Dept. Of Computer and Control Engineering Turin, Italy Technical Advisor: Ignacio Más Ivars Supervisor at KTH/IT Viktória Fodor Supervisor at Politecnico di Torino Antonio Lioy Content Background Probe Based Admission Control (PBAC) Testbed Architecture Policy Enforcing Protocol Performance Evaluation Conclusion Future Work Background Predictable QoS guarantees for Real Time services Integrate and support multimedia applications: VoIP, video/audio streaming etc. Best-Effort service unsatisfactory IETF set up working groups: IntServ RFC 1633 DiffServ RFC 2475 Measurement Based Admission Control (MBAC) Solve scalability problems Combine IntServ and DiffServ architecture Access control at the edge nodes: Probes the network to experience the congestion level Performs measurement on: Packet loss percentage, packet delay Accept/reject incoming session Probe Based Admission Control (PBAC) Provides a Controlled Load Service (CLS) Upper bound on packet loss, low delay Probe packets include: Peak bit rate, time duration, session identifier Router support: Distinguish probe and data packets Serve packets with priority Trust between network and end-users PBAC requirements Sender does not transmit data: At a higher bitrate than the one agreed If rejected by the receiver Receiver: Take a reliable admission decision Protection of the probing flow Testbed architecture Hardware: Celeron 800MHz, RAM 128 MBytes Testbed architecture Security issue Policy enforcing protocol Collection of cryptographic mechanisms Assist the probe phase of the PBAC Functions: Monitors PBAC users behavior Protects the probe phase from intruder attacks AG support at the borde