High Availability On Stacks - Dell S3048-ON Configuration Manual

Figure 110. 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:
Stack-unit ID:
Stack-unit Redundancy Role:
Stack-unit State:
Stack-unit SW Version:
Link to Peer:
Peer Stack-unit:
-- Stack-unit Redundancy Configuration
------------------------------------------------
Primary Stack-unit:
Auto Data Sync:
Failover Type:
Auto reboot Stack-unit:
Auto failover limit:
-- Stack-unit Failover Record
------------------------------------------------
804 Stacking
--
1
1
Primary
Active
9.8(0.0P2)
Down
not present
--
mgmt-id
Full
Hot Failover
Disabled
3 times in 60 minutes
--
1