Reference Guide

712 | Stacking S-Series Switches
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Merge Two S-Series Stacks
You may merge two stacks while they are powered and online. To merge two stacks, connect one stack to
the other using stacking cables. You may not connect 12G and 24G stack ports.
• FTOS selects a primary stack manager from the two existing mangers.
• FTOS resets all the units in the losing stack, and they all become stack members.
• If there is no unit numbering conflict, the stack members retain their previous unit numbers.
Otherwise, the stack manager assigns new unit numbers, based on the order that they come online.
• The stack manager overwrites the startup and running config on the losing stack members with its
own.
Split an S-Series Stack
To split a stack, unplug the desired stacking cables.You may do this at any time, whether the stack is
powered or not powered, and the units are online or offline. Each portion of the split stack retains the
startup and running configuration of the original stack.
For a parent stack that is split into two child stacks, A and B, each with multiple units:
• If one of the new stacks receives the primary and the secondary management units, it is unaffected by
the split.
• If one of the new stacks receives only the primary management unit, that units remains the stack
manager, and FTOS elects a new secondary management unit.
• If one of the new stacks receives only the secondary management unit, it becomes the primary
management, and FTOS elects a new secondary management unit.
• If one of the new stacks receives neither the primary nor the secondary management unit, the stack is
reset so that a new election can take place.
4 The management unit priority is 0 by default. If you
configure the priority of the new unit to 1, the stack will
reload. To avoid this scenario, configure the priority of
the management unit to the highest value (14).
Note: Do not configure the priority of the
replacement unit, as this will be transferred from the
management unit.
stack-unit <stack-unit>
priority <preference>
CONFIGURATION
5 Reload the switch to confirm the stack-unit number is
correct.
reset stack-unit 0-11 EXEC Privilege
6 Connect the new unit to the stack using stacking cables.
Note: You must use Telnet to connect to the management unit and copy the running configuration
(write-mem or copy run start) onto the replacement unit as the startup configuration, then reload the
system for the new settings to take effect. If the running configuration is not copied to the replacement
unit, the replacement unit will not have a startup configuration if it is removed from the stack and
reloaded.
Step Task Command Syntax Command Mode