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Cisco recommends retaining Layer 2 domains within each data center. However to meet new application framework requirements or for migration purposes, the Enterprise may have to extend Layer 2 beyond the Data Center. If there is no Layer 3 alternative, Cisco recommends the three approaches below. These approaches allow the safeguarding of sturdy extended Layer 2 networks while maintaining multipath redundancy with fast convergences and high performance. All of these solutions are executed in hardware and enterprises can deploy different Classes of Service by application.
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