Dell PowerConnect 8100 User's Configuration Guide - Page 146

2 For each switch in the stack, connect one or more cables from a stacking port on the switch to a stacking port on the next switch. If connecting cables in parallel for stacking, the port speeds must be identical. A 40G port configured as 4x10G is considered to be operating at a 10G speed. Add additional cables in parallel as needed until the desired stacking bandwidth is achieved. 3 Repeat this process until all of the devices are connected. 4 To complete the ring topology for the stack, connect one ore more stacking ports on the last switch to the remaining stacking port(s) on the first switch. Add additional cables (of the same speed) in parallel to achieve the desired stacking bandwidth. Figure 9-1. Connecting a Stack of PowerConnect 8024/8024F Switches SFP+ Ports Configured as Stack Ports How is the Stack Master Selected? A stack master is elected or re-elected based on the following considerations, in order: 1 The switch is currently the stack master. 146 Managing a Switch Stack