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. 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 --
------------------------------------------------
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
-- PEER Stack-unit Status --
------------------------------------------------
Stack-unit State: Standby
Peer Stack-unit ID: 2
Stacking 856