Managing a Switch Stack 175series switches. Likewise, Dell Networking N3000 series switches only stackwith other Dell N3000 series switches. Dell Networking N4000 series switchesstack with other Dell Networking N4000 series switches.How is the Stack Master Selected?A stack master is elected or re-elected based on the following considerations,in order:1 The switch is currently the stack master.2 The switch has the higher MAC address.3 A unit is selected as standby by the administrator, and a fail over action ismanually initiated or occurs due to stack master failure.In most cases, a switch that is added to an existing stack will become a stackmember, and not the stack master. When you add a switch to the stack, oneof the following scenarios takes place regarding the management status of thenew switch:• If the switch has the stack master function enabled but another stackmaster is already active, then the switch changes its configured stackmaster value to disabled.• If the stack master function is unassigned and there is another stackmaster in the system then the switch changes its configured stack mastervalue to disabled.• If the stack master function is enabled or unassigned and there is no otherstack master in the system, then the switch becomes stack master.• If the stack master function is disabled, the unit remains a non-stackmaster.If the entire stack is powered OFF and ON again, the unit that was the stackmaster before the reboot will remain the stack master after the stack resumesoperation.You can manually set the unit number for the switch. To avoid unit-numberconflicts, one of the following scenarios takes place when you add a newmember to the stack:• If the switch has a unit number that is already in use, then the unit thatyou add to the stack changes its configured unit number to the lowestunassigned unit number.
