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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Automatic and Manual Stack Unit Failover

Stack unit failover is the process of the standby unit becoming a management unit.

Dell EMC Networking OS fails over to the standby stack unit when:
  1. Communication is lost between the standby and primary stack unit.
  2. You request a failover via the CLI.

To display the reason for the last failover, use the show redundancy command from EXEC Privilege mode.

Example of the show redundancy Command

DellEMC#show redundancy

--  Stack-unit Status  --
------------------------------------------------
 Mgmt ID:                          1
 Stack-unit ID:                    12
 Stack-unit Redundancy Role:       Primary
 Stack-unit State:                 Active
 Stack-unit SW Version:            1-0(0-4679)
 Link to Peer:                     Up

--  PEER Stack-unit Status  --
------------------------------------------------
 Stack-unit State:                 Standby
 Peer Stack-unit ID:               5
 Stack-unit SW Version:            1-0(0-4679)

--  Stack-unit Redundancy Configuration  --
------------------------------------------------
 Primary Stack-unit:               mgmt-id    1
 Auto Data Sync:                   Full
 Failover Type:                    Hot Failover
 Auto reboot Stack-unit:           Enabled
 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  Feb 23 2016 22:17:18
             SSMGR:         succeeded  Feb 23 2016 22:17:18
   Start-up Config:         succeeded  Feb 23 2016 22:17:18
 Runtime Event Log:         succeeded  Feb 23 2016 22:17:18
    Running Config:         succeeded  Feb 23 2016 22:17:20
           ACL Mgr:         succeeded  Feb 23 2016 22:17:18
              LACP:         no block sync done
               STP:         no block sync done
              SPAN:         no block sync done
         CRYPTOMGR:         succeeded  Feb 23 2016 22:17:18
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