Concept Guide

Add Units to an Existing Stack
You can add units to an existing stack in one of three ways.
● By manually assigning a new unconfigured unit a position in an existing stack.
● By adding a configured unit to an existing stack.
● By merging two stacks.
If you are adding units to an existing stack, you can either:
● allow Dell EMC Networking OS to automatically assign the new unit a position in the stack, or
● manually determine each units position in the stack by configuring each unit to correspond with the stack before connecting
it.
● If you add a unit that has a stack number that conflicts with the stack, the stack assigns the first available stack number.
● 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 Dell EMC Networking OS generates a type mismatch error.
After the new unit loads, it synchronizes its running and startup configurations with the stack.
Manually Assigning a New Unit to an Existing Stack
To manually assign a new unit a position in an existing stack, use the following steps.
1. On the stack, determine the next available stack-unit number, and the management priority of the management unit.
EXEC Privilege mode
show system brief or show system stack-unit
2. On the new unit, number it the next available stack-unit number.
EXEC Privilege mode
stack-unit stack-unit-number renumber stack-unit-new-number
3. (OPTIONAL) On the new unit, assign a management priority based on whether you want the new unit to be the stack
manager.
CONFIGURATION mode
stack-unit stack-unit-number priority priority-number
4. Connect the new unit to the stack using stacking cables.
The following example shows adding a stack unit with a conflicting stack number (before).
Dell#show system brief
Stack MAC : 34:17:17:18:19:1e
Reload-Type : normal-reload [Next boot : normal-reload]
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
---------------------------------------------------------------------------------
1 Management online S3148P S3148P 1-0(0-4679) 54
2 Standby online S3148P S3148P 1-0(0-4679) 54
3 Member not present
4 Member not present
5 Member not present
6 Member not present
7 Member not present
8 Member not present
9 Member not present
10 Member not present
11 Member not present
12 Member not present
-- Module Info --
Unit Module No Status Module Type Ports
---------------------------------------------------------------------------
1 1 online S3148P-10GE-2SFP+ 2
2 1 online S3148P-10GE-2X10BaseT 2
-- Power Supplies --
Stacking
841