Service Manual

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 120.
High Availability on S-Series Stacks
S-Series 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 S-Series Stack Manager Redundancy
Dell#show redundancy
-- Stack-unit Status --
------------------------------------------------
Mgmt ID: 0
Stack-unit ID: 5
Stack-unit Redundancy Role: Primary
Stack-unit State: Active
Stack-unit SW Version: 1-0(0-3387)
Link to Peer: Up
Stacking
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