Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 29
Master Election Backup Unit Selection Rules, Recommended Procedures for Building a Stack
UPC - 745883572120
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Managing Device Information Managing Stacking 2 For example: • If there are two or more Master-enabled units and only one of them has been assigned as Force Master, the Force Master unit is the winner of step 1 and therefore the winner of the Master Election. • If there are two or more Master-enabled units that have been assigned as Force Master, then the Master Election proceeds to step 2, where the running times of the Force Master units are compared. If there is a winner at step 2, then the winner of that step also wins the Master Election and becomes the Master unit. • If there is no winner of step 2, the election proceeds to step 3. Only contending units that have succeeded in tieing in previous steps remain contenders. If there is a single unit with Unit ID=1, then that unit wins step 3 and the Master Election. • If there are two or more units assigned to Unit ID=1, then the election proceeds to step 4. There is always a winner of step 4 because MAC addresses are unique. Master Election Backup Unit Selection Rules The candidate that wins the Master Election becomes the Master unit. If there is a single runner-up unit, that unit becomes the Backup unit. If there is a tie for the runner-up position, then the tie is resolved by applying the Unit ID Conflict Resolution rules. Recommended Procedures for Building a Stack To avoid possible Unit ID conflicts and device shutdowns, Cisco recommends that the following procedures be adopted when configuring and managing stacks: • A stack should be initially configured by connecting all stack members in factory default mode. • If there is a preference for assigning specific Unit IDs to specific devices, then the stack should be built by connecting and booting the devices, in factory default mode, one by one in the desired Unit ID order that they will be assigned in the stack. That is, the device that will be the Master unit should be powered on first. After it boots and is automatically numbered (as Unit 1) it becomes the Master unit. The unit that will become the Backup unit is then connected to the Master unit and powered on. It is assigned to be Unit 2 by the Master unit and becomes the Backup unit. The next unit is then connected to either the Master (Unit 1) or Backup (Unit 2) unit and then powered on. It is assigned to be Unit 3 by the Master unit. Subsequent units are joined to the stack by connecting Cisco Small Business SFE/SGE Managed Switches Administration Guide 20