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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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High Availability on Stacks

Stacks have master and standby management units analogous to Dell EMC 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 EMC Networking OS elects a new standby unit. Dell EMC Networking OS resets the failed master unit: after online, it becomes a member unit; the remaining members remain online.

Example of Stack Manager Redundancy

DellEMC#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

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