Powering Up - Dell EMC PowerSwitch S4100-ON Series Installation Manual

3 Use the remaining stacking cable to connect the two remaining stacking ports together so that a ring topology is
assembled.
Figure 31. Connecting a Stack of Switches
A stack of three switches connected in a ring topology has these physical connections between the switches:
1. The bottom mini-SAS port on Unit 1 is connected to the top mini-SAS port on Unit 2.
2. The bottom mini-SAS port on Unit 2 is connected to the top mini-SAS port on Unit 3.
3. The bottom mini-SAS port on Unit 3 is connected to the top mini-SAS port on Unit 1.
After you power up a stack for the first time, the switches elect a master switch, which may occupy any location in the stack.
The Master LED on the front panel is illuminated on the master unit.
If a master failure is detected in the stack, the stacking feature supports a standby unit that assumes the master unit role. The
standby unit is automatically selected in the stack. When a master failure is detected, the standby unit initializes the control
plane and enables all other stack units with the current configuration. The standby unit maintains a synchronized copy of the
running configuration for the stack.
NOTE: You can (optionally) use the CLI to assign the master unit role, or select a different stack member as the standby
unit, based on priority or MAC address. For more information, see the Dell Configuration Guide for the S3100 Series or the
Dell Command Line Reference Guide for the S3100 Series.

Powering Up

To connect the chassis to the applicable power source, use the appropriate power cord. The system is powered up as soon as
the power cord is connected between the system and the power source.
CAUTION: Always disconnect the power cable before you service the power supply slots.
Install a S3100 Series System 41