Dell S4820T, Configuration Manual

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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
-- 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 --
------------------------------------------------
Failover Count: 0
Last failover timestamp: None
Last failover Reason: None
Last failover type: None
-- Last Data Block Sync Record: --
------------------------------------------------
stack-unit Config: succeeded Nov 25 2014 15:29:58
Start-up Config: succeeded Nov 25 2014 15:29:58
Runtime Event Log: succeeded Nov 25 2014 15:29:58
Running Config: succeeded Nov 25 2014 15:29:58
ACL Mgr: succeeded Nov 25 2014 15:29:58
LACP: no block sync done
STP: no block sync done
SPAN: no block sync done
Stacking
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