1 / 9

Resource Provisioning and Bandwidth Brokering for IP-core Networks

Explore strategies for providing end-to-end QoS in scalable IP-core networks. Topics include resource reservation, traffic prediction, hierarchical clearing house approach, and evaluation metrics.

trhonda
Download Presentation

Resource Provisioning and Bandwidth Brokering for IP-core Networks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Resource Provisioning and Bandwidth Brokering for IP-core Networks Chen-Nee Chuah ISRG Retreat Jan 10-12, 2000 Problem: How to provide end-to-end QoS in IP-core networks in a scalable manner?

  2. H1 H3 ISP2 ISP2 ISP2 H2 Example Scenario • SLA: Agreements that describe the volume of traffic exchanged, bandwidth reserved and price ISP2 SLA SLA ISP1 Resource Reservation ISP3

  3. Research Issues • Resource Provisioning • How to estimate bandwidth usage in advance for capacity planning purposes? • Adaptive Reservations • How to adapt aggregate reservations based on traffic fluctuation? • What are the trade-offs between granularity, QoS and signaling complexity? • Admission Control • End-to-end? • In stages: Per ISP cloud? Per domain?

  4. ISP2 ISP2 Hierarchical Clearing House Approach • Distributed database • reservation status, % link utilization, optimum path • Bandwidth brokering software agent • adapt reservation dynamically destination source Edge Router ISP n ISP2 ICH ICH ICH ISP1 CH1 CH1 CH2

  5. Resource Reservation Strategies • Aggregation of reservation requests • Hierarchical approach • De-couple notifications & reservation requests • Static and Dynamic Advanced Reservations Adapt Reservations- Advance reservations - Process reservation requests CH2 Notifications (every Du s) - Reservation status - Link utilization - Bandwidth predictor CH1 CH1 ICH ICH ICH ICH ERs aggregate reservation requests (Ta)

  6. Traffic Predictors • Monitoring system at Edge Router • Online measurement of aggregate rate of incoming & outgoing traffic (regular interval: West) • Two Traffic predictors for advanced reservations • Local Gaussian predictor for static reservation • Larger time-scale (e.g. an hour) • Compensate for the coarse granularity of the notifications • Auto-regressive predictor for dynamic reservation • Smaller time-scale (West)

  7. Evaluation • Overall Performance Metrics • Link utilization • % blocking/dropping • Bandwidth Estimator • How well does the predictor track the traffic fluctuation? • Choice of estimation window, % over-provisioning • Signaling between CHs • Sensitivity analysis: effect of aggregation on QoS and complexity • Completely de-coupled notifications • Limited notifications

  8. Boston Chicago Seattle NY DC Denver SF St. Louise Atlanta LA Orlando Houston Simulation Study: Network Topology • vBNS Backbone Network Map (1999) • Extreme cases - Dumbbell - Highway with merging paths

  9. Simulation Study: Workload Modeling • Two QoS classes • High priority voice calls and video conferencing • Best-effort data traffic (e.g. web, telnet, ftp) • Traffic model • Voice & video conferencing calls • Poisson arrivals with lv and lc Erlangs • Exponentially distributed call duration (mean = 2.5 min. for voice, 30 min. for video conferencing calls) • Individual source is modeled as two state-Markov chain. When “on”, a voice call requires bandwidth of 128 kbps, defined as one basic unit (BU) • Video conferencing calls occupy 4 BU • TCP connections get equal share of the non-reserved bandwidth

More Related