Muhammad Waris Sagheer and Syed Nawaz, Cisco
Level: Introductory/Intermediate
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:
In this tutorial we will walk through the following topics:
About the Presenters
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.
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.
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