Understanding Stacking Cable Failure; Inserting Too Many Units Into A Stack - Cisco Linksys SFE2000 Administration Manual

Linksys One Ready Communications Solution
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a Failed Member Stack Unit in an Operational Stack." The Master either connects the
running units to the stack using the current Unit ID numbers or renumbers them.
NOTE: Any time two stacks are combined into one stack,
there is no way to maintain the configuration for both sets
of switches. All dynamic information of the units that
belong to the portion of the stack that was not re-elected
to be the Stack Master is relearned.

Understanding Stacking Cable Failure

If the stacking connection cables fail and cause a stack split, the scenario described in
"Merging Two Stacks" applies. This occurs only if the stack uses a chain topology. Single
stacking cable failure will not cause a stack split if a ring topology is used.

Inserting Too Many Units into a Stack

If you try to insert too many units into a stack, when all units (existing and newly inserted)
are powered on at the same time, the following occurs:
1. A Stack Master is elected following the Master Discovery and Master Election processes.
All other units are shut down.
NOTE: Occasionally, due to a race condition during the
boot process, some of the units might be connected and
join the stack.
When a running group of units is added to an existing stack and each one of the stack
groups has an elected Stack Master, and the total of existing units and inserted units exceeds
the maximum allowed number of units (8) in a stack:
• The Master Detection and Master Election processes determine the Stack Master out
of one of the two combined stacking groups.
• When switches are added to a running stack, the Unit ID Allocation and Duplicate
ID conflict resolution processes detect an error if too many switches are present in the
stack, and no changes are made to units that originally belonged to the group
Chapter 3: Connecting the Switch
Stack Troubleshooting and Maintenance
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