Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 31
System Information, stand-alone, Switch, Operation Mode After Reset
UPC - 745883572120
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Managing Device Information Managing Stacking 2 • A stack is initially configured in chain topology and the units are connected as follows: Unit 2-Unit 5-Unit 1-Unit 4-Unit 6-Unit 8 The system administrator resets Unit 4 but does not realize that the Switch Operation Mode After Reset field on the System Information page was mistakenly checked as stand-alone. No physical connections are changed. Unit 4 reboots in stand-alone mode, effectively cutting off Units 6 and 8 from the stack. Units 6 and 8 are shut down. The stack continues to operate, but with Units 1, 2 and 5 being the only active units. • In the previous example, suppose that the system administrator realizes the error after rebooting Unit 4 as a stand-alone device. The system administrator should reboot Unit 4 in Stack mode. If the stack has not been reset, the Master unit retains the original stack configuration file. Also, Unit 4 retains its stacking configuration information when its mode is changed from Stack to stand-alone, and restores that information when returning to Stack mode. • A stack is initially configured and all units are manually numbered. The units are connected in a chain topology as follows: Unit 2-Unit 5-Unit 1-Unit 3-Unit 4-Unit 6-Unit 7-Unit 8 Unit 3 fails. Since Units 4, 6, 7 and 8 are cut off from the Master unit, they are automatically shut down. This leaves only Units 1, 2 and 5 running in the stack. The system administrator prepares a replacement unit by manually renumbering a unit from another stack. However, the replacement unit is mistakenly renumbered as Unit 4 instead of Unit 3. What happens if the replacement unit is inserted into the running stack (in the same position as Unit 3)? When the new Unit 4 is inserted into the running stack, the Master unit executes Topology Discovery and discovers the new Unit 4. But now the presence of the old Unit 4 is also discovered because of the revived Cisco Small Business SFE/SGE Managed Switches Administration Guide 22