Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 956
Management Unit Selection on S-Series Stacks, For example
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www.dell.com | support.dell.com Stack-unit State: Stack-unit SW Version: Link to Peer: Active 7.8.1.0 Up -- PEER Stack-unit Status -- Stack-unit State: Standby Peer stack-unit ID: 2 Stack-unit SW Version: 7.8.1.0 -- Stack-unit Redundancy Configuration -- Primary Stack-unit: mgmt-id 0 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 Mar 24 2009 20:35:14 Start-up Config: failed Mar 24 2009 20:35:14 Runtime Event Log: succeeded Mar 24 2009 20:35:14 Running Config: succeeded Mar 24 2009 20:35:14 ACL Mgr: succeeded Mar 24 2009 20:35:14 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 0; if a priority tie occurs, the system with the highest MAC address supersedes, as shown in the following example. Stack>show system brief Stack MAC : 00:01:e8:d5:f9:6f -- Stack Info -- Unit UnitType Status ReqTyp CurTyp Version Ports 0 Standby online S50V S50V 7.8.1.0 52 956 | Stacking S-Series Switches
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