Reference Guide

– stack-group 0 corresponds to ports 0-3, stack-group 1 corresponds to ports 4-7, so on through
stack-group 11.
– stack-group 12 corresponds to the 40G port 48, stack-group 13 corresponds to port 52, so on
through stack group 15.
Figure 125. Stack-Group Assignments
You can connect the units while they are powered down or up. Stacking ports are bi-directional.
When a unit is added to a stack, the management unit performs a system check on the new unit to
ensure the hardware type is compatible. A similar check is performed on the Dell Networking OS version.
If the stack is running Dell Networking OS version 8.3.12.0 and the new unit is running an earlier software
version, the new unit is put into a card problem state.
• If the unit is running Dell Networking OS version 8.3.10.x, it is upgraded to use the same Dell
Networking OS version as the stack, rebooted, and joined the stack.
• If the new unit is running an Dell Networking OS version prior to 8.3.10.x, the unit is put into a card
problem state, Dell Networking OS is not upgraded, and a syslog message is raised. The unit must be
upgraded to Dell Networking OS version 8.3.12.0 before you can proceed.
Syslog messages are generated by the management unit:
• before the management unit downloads its Dell Networking OS version 8.3.12.0 or later to the new
unit. The syslog includes the unit number, previous version, and version being downloaded.
• when the firmware synchronization is complete.
• 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 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
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.
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Stacking