The Cisco Catalyst 4900M Series (Figure 1) is a premium extension to the widely deployed Cisco Catalyst 4900 Series top-of-rack Ethernet switch specifically designed for data center networks. Optimized for ultimate deployment flexibility, the Cisco Catalyst 4900M can be deployed for 10/100/1000 server access with 1:1 uplink-to-downlink oversubscription and a mix of 10/100/1000 and 10 Gigabit Ethernet servers or all 10 Gigabit Ethernet server environments.