Universal Ethernet Ports

The Universal Ethernet ports, or stacking ports, are located on the front panel of the switch and are labeled U1 and U2. These ports can be used with Switch Engine as stacking ports, or as Ethernet ports with Switch Engine and Fabric Engine in non-fabric mode (Fabric Engine does not support stacking).

The Universal Ethernet ports operate as Ethernet ports by default. Use the commands

configure stacking-support stack-ports all selection native V100 
enable stacking-support

to set the U1 and U2 ports in stacking mode.

When used as Ethernet ports, the U1 and U2 ports support data rates of 25Gbs using SFP28 optics. Models 5120-44X-4Y-2C, 5120-44X-4Y-2C-AC-F, 5120-44X-4Y-2C-AC-R, 5120-44X-4Y-2C-TAA, and 5120-44X-4Y-2C-AC-F-TAA support data rates of 100Gbps on the QSFP28 ports 49 and 50.

For information on switch stacking, see Build Stacks.