Users Guide

Automatic and Manual Stack Unit Failover
Stack unit failover is the process of the standby unit becoming a management unit.
Dell 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
Dell#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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