Dell S4048T - Supported Stacking Topologies; High Availability on Stacks

Supported Stacking Topologies
The device supports stacking in a ring or a daisy chain topology.
Dell Networking recommends the ring topology when stacking the switches to provide redundant
connectivity.
Figure 124. Supported Stacking Topologies
High Availability on Stacks
Stacks have master and standby management units analogous to Dell Networking route processor modules
(RPM).
The master unit synchronizes the running configuration and protocol states so that the system fails over in
the event of a hardware or software fault on the master unit. In such an event, or when the master unit is
removed, the standby unit becomes the stack manager and Dell Networking OS elects a new standby unit.
Dell Networking OS resets the failed master unit: after online, it becomes a member unit; the remaining
members remain online.
Example of Stack Manager Redundancy
Dell#show redundancy
-- Stack-unit Status --
Stacking 1017