Administrator Guide

● if the system check fails, a message such as a hardware incompatibility message or incompatible uboot version is generated.
If the unit is placed in a card problem state, the management unit also generates an SNMP trap.
● if the software version of the new unit predates Dell EMC Networking OS version 8.3.12.0 , the management unit puts the
new unit into a card problem state and generates a syslog that identifies the unit, its Dell EMC Networking OS version, and
its incompatibility for firmware synchronization.
NOTE: You must enter the stack-unit stack-unit stack-group stack-group command when adding units to
a stack to ensure the units are assigned to the correct groups.
NOTE: Any scripts used to streamline the stacking configuration process must be updated to reflect the Command Mode
change from EXEC to CONFIGURATION to allow the scripts to work correctly.
Enabling Front End Port Stacking
To enable the front ports on a unit for stacking, use the following commands.
NOTE: You can stack a maximum of two stack groups.
NOTE: After a port is allocated for stacking, you can only use it for stacking. If stack-group 0 is allocated for stacking, you
can use ports 1, 2, 3, and 4 for stacking but not for Ethernet anymore. If only port 1 is used for stacking, ports 2, 3, and 4
are spare; they cannot be used for Ethernet.
1. Assign a stack group for each unit.
CONFIGURATION mode
stack-unit id stack-group id
Begin with the first port on the management unit. Next, configure both ports on each subsequent unit. Finally, return to the
management unit and configure the last port.
The range is from 0 to 17.
2. Save the stacking configuration on the ports.
EXEC Privilege mode
write memory
3. Reload the switch.
EXEC Privilege mode
reload
Dell EMC Networking OS automatically assigns a number to the new unit and adds it as member switch in the stack.
The new unit synchronizes its running and startup configurations with the stack.
4. After the units are reloaded, the system reboots. The units come up in a stack after the reboot completes.
To view the port assignments, use the show system stack-unit command.
Creating a New Stack
Prior to creating a stack, know which unit will be the management unit and which will be the standby unit.
Enable the front ports of the units for stacking. For more information, refer to Enabling Front End Port Stacking.
To create a new stack, use the following commands.
1. Power up all units in the stack.
2. Verify that each unit has the same Dell EMC Networking OS version prior to stacking them together.
EXEC Privilege mode
show version
3. Manually configure unit numbers for each unit, so that the stacking is deterministic upon boot up.
EXEC Privilege mode
stack-unit stack—unit—number renumber stack—unit—number.
Renumbering causes the unit to reboot. The stack-unit default for all new units is stack-unit 1.
4. Configure the switch priority for each unit to make management unit selection deterministic.
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Stacking