Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 30
Adding, Replacing and Removing Stacking Members - Examples, removed, leaving Units 4 - replacement
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Managing Device Information Managing Stacking 2 each one to any existing stack member unit and then powering the new unit on. Each new unit is assigned the next available Unit ID. • After the stack is initialized and configured, the system administrator may reset the Unit IDs manually to the same values assigned by automatic numbering. Adding, Replacing and Removing Stacking Members - Examples The following examples illustrate stacking behavior when adding, replacing or removing stack members: • A stack is initially configured with Units 1,2,3,4,5,6,7,8. Master Unit 1 is then removed while the stack is running and is replaced with another switch that is in factory default mode. What happens? When Master Unit 1 is removed, Backup Unit 2 automatically becomes the Master unit. The newly inserted Unit 0 enters the stack and is automatically numbered as Unit 1, but remains a stacking member (Since it did not enter the stack as a Master-enabled unit and the stack already had a Master unit, its entry did not trigger a Master Election.). However, after being assigned to be Unit 1, it becomes a Master-enabled unit and will be a candidate in the next Master Election. For instance, if the stack is reset, it will win the Master Election and become the Master unit, while the present Master unit, Unit 2, will become the Backup unit. Removing or replacing stack members incorrectly may result in an inoperable unit or stack, as illustrated in the following examples: • A stack is initially configured with Units 1,2,4,6,7. Units 1 and 2 are then removed, leaving Units 4, 6, 7. The stack is permanently disabled because there is no Master unit, and the remaining units 4, 6, 7 are shut down. There are no Master-enabled units, so Master Election cannot take place. In this example, it makes no difference whether or not Units 4, 6, 7 were automatically numbered or manually numbered. Rebooting the units does not change the situation, even for automatically numbered units. Since there are no Unit ID conflicts, all the units retain their Unit IDs and therefore Automatic Unit ID Assignment does not occur. Then, after rebooting, all units are again shut down. Only by selecting one of the remaining units to be Force Master or by manually resetting at least one of them to factory default (Unit 0) mode can these units be configured as an active stack. Cisco Small Business SFE/SGE Managed Switches Administration Guide 21