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Connecting the Stacking Ports (Optional)

You can connect up to 12 switches to operate as a single unit, using two fixed Mini Serial Attached SCSI (miniSAS) stacking

connectors on the PSU side. When you connect multiple switches together through the stack ports, the stack operates and is

managed as a single entity. You can combine different platforms within the S3100 series into one stack.

Dell recommends installing the switches connected in a ring topology. Assemble and cable the stack of switches before

powering up and configuring it.

To install your switches in a ring topology, follow these steps.

1. Connect one of the mini-SAS cables into either of the stacking ports of the top switch and the switch directly below it. As

necessary, use a separately purchased, longer (1 meter or 3 meter) mini-SAS cable to connect the switches.

2. Repeat this process until all the devices are connected.

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.

Install a S3100 Series System