Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 716
Management Unit Selection on S-Series Stacks, S55 Stack Manager Redundancy - s55 stacking
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www.dell.com | support.dell.com Figure 40-1. S55 Stack Manager Redundancy Force10#show redundancy --------- Stack-unit Status --------- Mgmt ID: 1 Stack-unit ID: 0 Stack-unit Redundancy Role: Primary Stack-unit State: Active Stack-unit SW Version: SD8.3.5.1 Link to Peer: Up --------- PEER Stack-unit Status Stack-unit State: Peer stack-unit ID: Stack-unit SW Version: Standby 1 SD8.3.5.1 --------- Stack-unit Redundancy Configuration Primary Stack-unit: mgmt-id 1 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: 3 Last failover timestamp: Oct 30 2010 04:15:36 Last failover Reason: User request Last failover type: Hot Failover --------- Last Data Block Sync Record Stack Unit Config: succeeded Oct 30 2010 04:16:13 Start-up Config: succeeded Oct 30 2010 04:16:13 Runtime Event Log: succeeded Oct 30 2010 04:16:13 Running Config: succeeded Oct 30 2010 04:16:13 ACL Mgr: succeeded Oct 30 2010 04:16:13 LACP: no block sync done STP: no block sync done SPAN: no block sync done Force10# Management Unit Selection on S-Series Stacks FTOS has a selection algorithm to decide which stack units will be the primary and secondary management units. During the bootup of a single unit or the stack, FTOS compares the priority values of all of the units in the stack and elects the unit with the numerically highest priority the primary, and the next highest priority the secondary. For example, if you add a powered standalone unit to a stack, either the standalone unit or the stack reloads (excluding the new unit), depending on which has the higher priority, the new unit or the existing stack manager. If the new unit has the higher priority, it becomes the new stack manager after the stack reloads. All switches have a default priority of 1; if a priority tie occurs, the system with the highest MAC address supersedes, as shown in Figure 40-2. 716 | Stacking S-Series Switches
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