Users Guide

• All stack units must have the same version of Dell Networking OS.
Stacking Installation Tasks
The following are the stacking installation tasks.
• Create a Stack
• Add Units to an Existing Stack
• Split a Stack
Create a Stack
No configuration is allowed on front end ports used for stacking. Stacking can be made between 40G ports
of two units. The stack links between the two units are grouped into a single LAG.
Stack Group/Port Numbers
By default, each unit in Standalone mode is numbered stack-unit 1.
A maximum of six 40G stack links can be made between two units in a stack. The front end ports are divided
into 32 stack groups, each with 40G of bandwidth.
The front end ports accommodate QSFP+.
• Ports are divided into 32 stack-groups (0 to 31) as shown in the following example.
• stack-group 0 to 31 corresponds to 32 40 gig ports
Figure 115. Stack-Group Assignments
You can connect the units while they are powered down or up. Stacking ports are bidirectional.
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 versionand 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 it is upgraded to use the same Dell Networking OS
version as the stack, rebooted, and joined the stack.
Stacking 948