Users Guide

Figure 117.
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 conguration 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
-- PEER Stack-unit Status --
------------------------------------------------
Stack-unit State: Standby
Peer Stack-unit ID: 2
Stack-unit SW Version: 1-0(0-3387)
-- Stack-unit Redundancy Configuration --
------------------------------------------------
Primary Stack-unit: mgmt-id 0
Auto Data Sync: Full
Failover Type: Hot Failover
Auto reboot Stack-unit: Disabled
Auto failover limit: 3 times in 60 minutes
-- Stack-unit Failover Record --
Stacking
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