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Interconnecting Data Centers Using VPLS (Ensure Business Continuance on Virtualized Networks by Implementing Layer 2 Connectivity Across Layer 3) by Patrice Bellagamba, Nash Darukhanawalla - CCIE No. 10332

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Chapter 2. Appraising Virtual Private LAN Service

High-availability requirements of virtualization technologies, the costs associated with deploying and maintaining a dedicated fiber network, and technology limitations have led to the development of Virtual Private LAN Service (VPLS)-based solutions. These solutions provide multipoint Layer 2 (L2) connectivity services across geographically dispersed data centers over a Layer 3 (L3) network infrastructure.

Key objectives for using L3 routing rather than L2 switching to interconnect data centers include the following:

• Resolve core link-quality problems using L3 routing technology

• Remove data center interdependence using spanning-tree isolation techniques

• Provide storm-propagation control ...

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