Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 895

- Stacking with 1G interfaces is not supported. • Stacking on the S4820T is accomplished through front-end user ports on the chassis. • All stack units must have the same version of Dell Networking OS. S-Series Stacking Installation Tasks The following are the S-Series stacking installation tasks. • Create an S-Series Stack • Add Units to an Existing S-Series Stack • Remove Units or Front End Ports from a Stack • Split an S-Series Stack Create an S-Series Stack Stacking is enabled on the S4820T using the front end ports. No configuration is allowed on front end ports used for stacking. Stacking can be made between 10G ports of two units or 40G ports of two units. The stack links between the two units are grouped into a single LAG. Stack Group/Port Numbers By default, each unit in Standalone mode is numbered stack-unit 0. A maximum of eight 10G stack links or two 40G stack links can be made between two units in a stack. The front end ports are divided into 16 stack groups, each with 40G of bandwidth. Stack groups 0 through 11 correspond to 10G stack groups with four ports each. Stack groups 12 to 15 are one 40G port each. The front end ports accommodate SFP, SFP+ and QSFP+. • Ports are divided into 16 stack-groups (0 to 15) as shown in the following example. The stack groups must be of a single speed - either all 10G or all 40G. - stack-group 0 corresponds to ports 0-3, stack-group 1 corresponds to ports 4-7, so on through stack-group 11. - stack-group 12 corresponds to the 40G port 48, stack-group 13 corresponds to port 52, so on through stack group 15. Figure 118. S4820T Stack-Group Assignments You can connect the units while they are powered down or up. Stacking ports are bi-directional. When a unit is added to a stack, the management unit performs a system check on the new unit to ensure the hardware type is compatible. A similar check is performed on the Dell Networking OS version. Stacking 895