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NANOG Meeting Presentation Abstract

Tutorial: L2VPN: Path to Convergence<BR>Level: Introductory
Meeting: NANOG36
Date / Time: 2006-02-14 2:00pm - 3:30pm
Room: Regency Ballroom
Presenters: Speakers:

Muhammad Waris Sagheer, Cisco Systems

Muhammad Waris Sagheer is a Senior Software Engineer for the High End Routing Organization in Cisco Systems, specializing in Advanced MPLS Technologies. He provides design, consulting, and escalation assistance to US, European, and Asian service providers for ATM and MPLS technologies. Muhammad has presented on various MPLS-related topics at the APRICOT 2005 and the Networkers conference, as well as MPLS Power Sessions to European Service Providers and Enterprise customers. He is the co-author of case studies and articles in the Cisco Press book MPLS Configuration on Cisco IOS Software, Packet magazine, and Techworld.

Syed Nawaz, Cisco Systems

Syed Natif Nawaz has more than seven years of experience in networking design, including five years of experience with Cisco IOS-XR software. He is currently the IOS-XR Software Development Manager at Cisco Systems, where he works on customer-focused IOS and IOS-XR defect resolution, feature integration, release processes, and general serviceability guidelines. He is the co-author of articles in Techworld and Packet magazines. Formerly, Syed worked as a Development engineer at Assured Access technologies and Alcatel, where he developed software for Access Concentrators. In addition to higher education in Electrical and Electronics from University of Madras, Syed holds an M.S. in Computer Science and Engineering from State University of New York at Buffalo.
Abstract: Initially, Virtual Private Networks were built using leased lines. Service providers were offering VPNs based on point-to-point data link layer connectivity, using ATM or Frame Relay virtual circuits. Customers built their own Layer 3 networks to accommodate IP traffic. As a result, separate networks exist for Layer 2 and Layer 3 traffic, but maintaining separate networks for Layer 2 VPNs, Layer 3 VPNs and Internet traffic is difficult and very costly.



In order to maximize return on their assets and minimize their operating costs, service providers often look to consolidate the delivery of multiple service types onto a single networking technology. As packet traffic takes up a larger and larger portion of the available network bandwidth, it becomes increasingly useful to optimize public networks for IP. As a result, service providers are moving to converged IP/MPLS networks, and they need a single infrastructure for delivering Layer 2 (including transport) and Layer 3 services to their internal and external customers. L2VPN is the architectural framework for accomplishing this, regardless of whether the Layer 2 service is ATM, Frame Relay, Ethernet, PPP, or HDLC. L2VPN encapsulates packets at the provider edge router, transports them over the backbone to the provider edge router on the other side of the cloud, removes encapsulation, and sends them to their destination.



The solution has the following benefits:

  • Reduces operating expenses (OpEx) and capital expenditures (CapEx)

  • Offers a new set of services, such as Metro Ethernet
    MPLS uses frames or cells. L2VPN can work in IP over ATM networks and IP over MPLS networks

  • L2VPN can be combined with Quality of Service and Traffic Engineering to build new revenue-generating services

  • VPLS is a service targeted for enterprise networks to connect geographically separate LAN segments together across a WAN.




In this tutorial we will walk through the following topics:

  • Virtual Private Wire Service (VPWS): like-to-like and interworking attachment circuits

  • VPLS (Virtual Private Lan Service): point-to-multipoint

  • Guaranteed Quality of Service

  • Traffic Engineering and fast reroute for L2VPN

  • MPLS OAM L2VPN circuits

  • Pseudowire redundancy & tunnel stitching

  • High availability and reliability

  • Convergence

  • L2VPN troubleshooting


L2VPN (interworking & VPLS) demo
Files: youtubeL2VPN: Path to Convergence<BR>Level: Introductory
Sponsors: None.

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