Users Guide
• Split a Stack
Create a Stack
Stacking is enabled on the device using the front end ports.
No conguration 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 0.
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 118. 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 version9.7.0.0and
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 9.7.0.0 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 to9.7.0.0, 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 9.7.0.0 before you can proceed.
Syslog messages are generated by the management unit:
• before the management unit downloads its Dell Networking OS version 9.7.0.0 or later to the new unit. The syslog includes the unit
number, previous version, and version being downloaded.
• when the rmware 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 9.7.0.0, the management unit puts the new unit into a card
problem state and generates a syslog that identies the unit, its Dell Networking OS version, and its incompatibility for rmware
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.
806 Stacking