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Chapter 3: Connecting the Switch

Stack Troubleshooting and Maintenance

Linksys One Ready Communications Solution

Chapter

If the incoming units are powered off, follow the procedures described in “Building a New

Stack” in the “Building Automatically-Configured Stacks” or “Building Manually-Configured

Stacks” sections. Repeat the process for each unit inserted into the stack.

If both stacks to be merged are running (for example, you are connecting the stacking cables

of two stacks), the following occurs:

• If each of the joined stacks has a Stack Master unit, both Stack Master units perform the

Master Discovery process and participate in the Master Election process. One of the

Stack Master units is selected as the Stack Master unit for the merged stack. The criteria

for choosing the Stack Master are as follows:

- Force Master: If Force Master is enabled, the unit that is configured as the forced

unit is selected as the Stack Master.

- System Up Time: Up time is measured by quantities of 10-minute intervals. If the

number of 10 minute intervals is higher for one of the units, this unit is selected

as the Stack Master.

- Lowest Unit ID: If both units have the same up time (measured in intervals of 10

minutes), the unit with the lowest unit ID is selected as the Stack Master.

- Lowest MAC: If both Master unit ID numbers are equal, the unit with the Lower

MAC address is chosen as the Stack Master.

The Stack Master unit that loses its “mastership” in the Master Election process is

renumbered if the unit ID was dynamically allocated. The new Stack Master allocates it a

new number and configures it as a stack member or a Backup Master. It will be shut

down if the unit ID was manually allocated. We recommend that the administrator

configure the unit to receive an auto-assigned Unit ID before reconnecting it to the stack.

When two stacks are combined, all of the configuration information for one of the stacks

is lost. Only the surviving Stack Master (after the discovery and election processes are

complete) maintains its configuration information.

NOTE: There will never be two units with the same Unit ID

at the end of the merge.

Cisco SGE2000 Administration Guide

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