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Experiences with Deploying a Global IP/MPLS Network

Experiences with Deploying a Global IP/MPLS Network. Thomas Telkamp Director Data Architecture and Technology Global Crossing Telecommunications, Inc. telkamp@gblx.net. China International Summit Technology Convergence & Next Generation Networks September 25 - 26, 2001

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Experiences with Deploying a Global IP/MPLS Network

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  1. Experiences with Deploying a Global IP/MPLS Network Thomas Telkamp Director Data Architecture and Technology Global Crossing Telecommunications, Inc. telkamp@gblx.net China International Summit Technology Convergence & Next Generation Networks September 25 - 26, 2001 Beijing, P.R. China

  2. Agenda • Global Crossing Network • IP Network Evolution and Philosophy • MPLS Deployment • IP VPNs • Multi-Service and DiffServ • New Features • Other Issues • Summary

  3. Global Crossing History • The First Independent Global Fiber Network • Started operations in March 1997 • First segment in service on May 26, 1998 • Expanding Network and Services by acquisitions: • Frontier Telecommunications, Sept 1999 • Racal Telecom, Nov 1999 • Hutchison Global Crossing, Jan 2000 • IXNET/IPC, June 2000 • Global Network • 100,000 route mile, 27 countries, 200 major cities

  4. Cable ship...

  5. …and the cable.

  6. Global IP Backbone Network

  7. Global IP Network • OC-48c/STM-16c (2.5Gbps) IP backbone • Some 10Gbps segments operational (e.g. Atlantic) • Multi-Vendor: • Cisco GSR 12000/12400 • Juniper M20/M40/M160 • BGP and IS-IS routing protocols • Internet Access & Transit Services • IP VPN, Layer 3 and Layer 2 • Global MPLS and DiffServ deployment

  8. IP Network Evolution • Network technology and usage changes over time • Roadmap • US domestic backbone for Internet traffic • MPLS deployment for Traffic Engineering • Global extension of the network • RFC2547 VPNs • DiffServ deployment for multi-service • Optimization for critical services (e.g. voice)

  9. Network Philosophy • No bottlenecks in normal condition • Overprovisioning • with use of Traffic Engineering network can handle all traffic, even when the most critical links fails • MPLS Traffic Engineering to prevent congestion • DiffServ to manage congestion • Too complex and too many features will make the network unreliable/unstable

  10. MPLS Deployment • Operational since 2Q 1999 • Traffic Engineering • IP TTL issues • Worldwide MPLS mesh 1Q 2001 • Currently over 6000 MPLS LSPs • Support for RFC2547 VPNs • MPLS/BGP technology

  11. MPLS LSP Deployment

  12. MPLS Deployment Experiences and Challenges • Router vendor interoperability • Cisco and Juniper • New features... • Requires seamless network • Single AS • Single IGP (no multiple areas/levels) • NOC education and training • Network Management • Software to support Traffic Engineering

  13. Why Traffic Engineering?

  14. MPLS Traffic Engineering

  15. IP VPNs • RFC2547 VPN • Based on existing MPLS and BGP protocols • Minimal impact on operations if already running a MPLS based Internet backbone • Layer 2 variant under development

  16. DiffServ Deployment • Increase revenue by value-added services • Best-Effort • Internet • Assured • trading and non-interactive audio and video) • Real-time • voice • Prefer ‘higher’ classes during congestion • major failures • guarantee delay and jitter

  17. DiffServ Challenges • How many classes? • What are the targeted applications for each class? • Can end users distinguish between classes? • How to implement these classes? • Different queuing/scheduling mechanisms • Strict Priority Queuing • WRR/WFQ • and combinations • Configuration and Monitoring issues...

  18. New Features • MPLS Fast Reroute • Provides SDH like restoration times for critical services (e.g. voice and trading) • Per-Class Traffic Engineering • Avoid concentration of real-time traffic at any link • Set upper limit on bandwidth reservations per class • IGP tuning for better performance • IS-IS parameters and configuration

  19. Other Issues... • What about GMPLS? • What are the benefits to the IP layer? • What problems does it solve? • Do we still need ATM? • Cell based networks have different characteristics than packet based networks • CBR service for Circuit Emulation • Should we build ‘Pure IP’ networks? • There are alternatives to MPLS Traffic Engineering and MPLS based VPNs

  20. Summary • Evolve existing network or build new network based on applications and requirements: • MPLS for Traffic Engineering • DiffServ for service differentiation • Advanced features for critical applications • Don’t underestimate the operational aspects of new technology in the network • Too complex and too many features will make the network unreliable and unstable

  21. Questions?

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