Stacking S-Series Switches | 835Stacking S-Series SwitchesThis chapter contains the following sections:• S-Series Stackability Features• Important Points to Remember• Stacking Commands Overview on page 85• Management Unit Selection Algorithm on page 85• Unit Number Assignment on page 86• Stack Management and Functionality on page 86• Adding a Switch to a Stack on page 89• Removing a Switch from a Stack on page 90• Setting Management Unit Preferences on page 91• Upgrading Software in a Stack on page 94• Using show Commands for Stacking Information on page 98S-Series Stackability Features• Stacking cable length availability:— Short stacking cable (60 cm)— Long stacking cable (4 meters)• Management unit (stack manager switch) selection algorithm• Stacking commands include commands that allow you to pre-configure a stack and commands tomanage the existing stack, including the selection of the stack management unit.Important Points to Remember• An S-Series stack acts much like a chassis with multiple cards. The management unit of the stack actslike the supervisor (RPM in an C-Series or E-Series), while the member units act like line cards. Forexample, a VLAN or LAG (port channel) can be comprised of interfaces from different units of thestack.• You manage the stack as a single switch by connecting to the management unit, which is a stackmember that gets elected by an algorithm that you can control. For details, see Management UnitSelection Algorithm on page 85.• The S50N, S50V, and S25P models of the S-Series can be stacked together. While the hardwareconnection limit is a maximum of eight units in the stack, Dell Force10 currently only supports a stackmaximum of three units.
