Reference Guide

964 | Stacking S-Series Switches
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Three configurable system variables affect how a new unit joins a stack: priority, stack number, and
provision.
• Depending on which has the higher priority, either the standalone unit or the entire stack reloads
(excluding the new unit). If the new unit has the higher priority, it becomes the new stack manager and
the stack reloads, as shown in Adding a Standalone with a Lower MAC Address to a Stack— Before,
Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack—After, Adding a
Standalone with a Lower MAC Address but Higher Priority to a Stack—Before, Adding a Standalone
with a Lower MAC Address but Higher Priority to a Stack—After.
• If you add a unit that has a stack number that conflicts with the stack, the stack assigns the first
available stack number, as shown in Adding a Stack Unit with a Conflicting Stack Number—Before
and Adding a Stack Unit with a Conflicting Stack Number—After.
• If the stack has a provision for the stack-number that will be assigned to the new unit, the provision
must match the unit type, or FTOS generates a type mismatch error, as shown in Adding a Stack Unit
with a Conflicting Stack Provision—Before and Adding a Stack Unit with a Conflicting Stack
Number—After.
After the new unit loads, it synchronizes its running and startup configurations with the stack.
To manually assign a new unit a position in the stack:
Adding a Stack Unit with a Conflicting Stack Number—Before
------------------------STANDALONE BEFORE CONNECTION----------------------------------
Standalone#show system brief
Stack MAC : 00:01:e8:d5:ef:81
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
---------------------------------------------------------------------------
0 Member not present S50V
1 Management online S50V S50V 7.8.1.0 52
2 Member not present
3 Member not present
Step Task Command Syntax Command Mode
1 While the unit is unpowered, install stacking modules in the new unit.
2 On the stack, determine the next available stack-unit
number, and the management prioritity of the
management unit.
show system brief
show system stack-unit
EXEC Privilege
3 Create a virtual unit and assign it the next available
stack-unit number.
stack-unit provision CONFIGURATION
4 On the new unit, number it the next available stack-unit
number.
stack-unit renumber
EXEC Privilege
5 (OPTIONAL) On the new unit, assign a management
priority based on whether you want the new unit to be
the stack manager.
stack-unit priority
CONFIGURATION
6 Connect the new unit to the stack using stacking cables.