Stack Group/Port NumbersBy default, each unit in Standalone mode is numbered stack-unit 1.A maximum of eight 10G stack links or two 40G stack links can be made between two units in a stack. The front end ports aredivided into 16 stack groups, each with 40G of bandwidth. Stack groups 0 through 11 correspond to 10G stack groups with four portseach. Stack groups 12 to 15 are one 40G port each.The front end ports accommodate SFP, SFP+ and QSFP+.• Ports are divided into 16 stack-groups (0 to 15) as shown in the following example. The stack groups must be of a single speed -either all 10G or all 40G.– 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 126. Stack-Group AssignmentsYou 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 iscompatible. A similar check is performed on the Dell Networking OS version. If the stack is running Dell Networking OS version8.3.12.0 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, DellNetworking OS is not upgraded, and a syslog message is raised. The unit must be upgraded to Dell Networking OS version8.3.12.0 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 theunit 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. Ifthe 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 unitinto a card problem state and generates a syslog that identifies the unit, its Dell Networking OS version, and its incompatibility forfirmware synchronization.NOTE: You must enter the stack-unit stack-unit stack-group stack-group command when adding units toa 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 Modechange from EXEC to CONFIGURATION to allow the scripts to work correctly.Stacking 827
