Lenovo Networking Best Practices for CNOS: Network Design and Topologies

This paper shows recommended network topologies with a focus on avoiding the use of Spanning Tree and providing maximal bandwidth and redundancy to serve a cluster of servers in a data center environment. The examples shown rely on the use of the CNOS firmware in Lenovo® top-of-rack switches. This paper is suitable for network designers and architects involved in designing or modifying a data center.

Introduction
Full mesh topology with Virtual Link Aggregation
Inverted U topology with failover
Traditional STP design with blocking
Isolated management network
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Changes in the January 31 update:

• Minor corrections to improve clarity

Related product families

Product families related to this document are the following:

• 10 Gb Ethernet Connectivity
• 100 Gb Ethernet Connectivity
• 25 Gb Ethernet Connectivity
• Cloud Networking Operating System (CNOS)