Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 32
Managing Stacks, Stack Management
UPC - 745883572120
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Managing Device Information Managing Stacks 2 connection to the stack via the new Unit 4. The old Unit 4 and the new Unit 4 appear to the Master unit as two new, manually numbered units trying to simultaneously join the stack. Therefore, both units are shut down, and thus Units 6, 7 and 8 remain shut down. What happens if the replacement unit is inserted into the stack (in the same position as Unit 3) after first powering off all units and then simultaneously powering on all units? If all units in the stack are reset, the Master unit performs Topology Discovery during the software boot, revealing that there are two duplicate Unit IDs (old and new Unit 4). Since both units are manually numbered, both units are shut down by the Master unit. This, in turn, again leaves Units 6, 7 and 8 disconnected from the Master unit, thus shutting them down also. • A stack is initially configured in a chain topology as follows: Unit 8-Unit 5-Unit 1-Unit 3-Unit 4-Unit 6-Unit 7-Unit 2 Unit 1 is the Master and Unit 2 is the Backup. Unit 3 fails. What happens? The failure of Unit 3 disconnects Units 4, 6, 7 and 2 from the Master unit. Backup Unit 2 senses the loss of the Master and automatically becomes the Master of a stack comprised of Units 2, 4, 6 and 7. Unit 1 remains the Master of the now reduced stack, consisting of Units 1, 5 and 8. Thus the failure of Unit 3 has split the original stack into two smaller stacks. However, while the two stacks continue in operation, this situation may create problems on the network because Unit 2 and Unit 1 have the same Master configuration files. The significance of this is that both stacks share the same IP address, making network communication with either stack ambiguous. Managing Stacks The Stack Management Page allows network managers to configure stacking members on the device and determine to either reset the entire stack or a specific device. Device configuration changes that are not saved before the device is reset are not saved. If the Master unit is reset, the entire stack is reset. To open the Stack Management Page: Cisco Small Business SFE/SGE Managed Switches Administration Guide 23