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Overlay Transport Virtualization (OTV)

Cisco OTV Overview

Extend Layer 2 VLANs across multiple data centers over any network. (7:09 min)

Extend Layer 2 Applications Across Distributed Data Centers

Overlay Transport Virtualization (OTV) on the Nexus 7000 is an industry-first technology that significantly simplifies extending Layer 2 applications across distributed data centers. You can now deploy Data Center Interconnect (DCI) between sites without changing or reconfiguring your existing network design.

With OTV you can deploy virtual computing resources and clusters across geographically distributed data centers, delivering:

  • Transparent workload mobility
  • Business resiliency
  • Superior computing resource efficiencies

As customers deploy multiple geographically disparate data centers, they're looking for scalable and simplified network solutions to extend virtualization and cluster domains between multiple data centers.

Important OTV Features


  • Extends Layer 2 LANs over any network that supports IP
  • Designed to scale across multiple data centers


  • Supports transparent deployment over existing network without redesign
  • Requires minimal configuration commands (as few as four)
  • Provides single-touch site configuration for adding new data centers


  • Preserves existing Layer 3 failure boundaries
  • Provides automated multihoming
  • Includes built-in loop prevention


  • Optimizes available bandwidth, by using equal-cost multipathing and optimal multicast replication


Additional Resources