Glossary

Even if mixed-mode stacking is enabled on any switch other than the S4048-ON or S4048T-ON switches, the new unit is
not allowed to join a stack that contains S4048-ON or S4048T-ON switches.
Important Points on Mixed-mode Stacking
● To form a mixed-mode stack, use only the 40G ports between the range 49 to 54.
● You cannot form a mixed-mode stack using the 10G ports. Because, the 10G ports on the S4048T-ON are copper ports;
where as, the 10G ports on the S4048-ON are SFP ports.
● It is mandatory to enable mixed-mode stacking on the S4048-ON and S4048T-ON switches before joining a mixed-mode
stack.
● Stack election is based on the priority or the MAC address of the stack units as in homogenous stacking. The stack-unit with
the highest priority or MAC address is chosen as the master.
Hardware Watchdog in Mixed-mode stacking
The Hardware watchdog command is enabled by default in the S4048T-ON. In the S4048-ON switch, hardware watchdog is not
supported.
In a mixed-mode stacking scenario, you must enable Hardware Watchdog on the S4048T-ON switch.
You can enable the hardware watchdog tiner using the following command: hardware watchdog stack-unit {stack-
unit-number | all}
In a mixed-mode stack, where the S4048T-ON is the master, the system allows configurations to be pushed to a newly joined
the S4048T-ON switch. If the newly joined member unit is a S4048-ON switch, then the configurations are not pushed to the
switch.
NOTE:
Similarlly, the TDR feature is available only, when the S4048T acts a master. The TDR specific command is disabled
when the S4048–ON is the master.
In a mixed-mode stack, where the S4048-ON is the master, the hardware watchdog timer must be enabled on the S4048-ON
switch. The system allows configurations to be pushed to a newly joined S4048T-ON switch. If the newly joined member unit is
a S4048-ON switch, then the configurations are not pushed to the switch.
Important Points to Remember
● You can stack up to six systems.
● You cannot stack one system with other system types.
● You cannot enable stacking and virtual link trunking (VLT) simultaneously on the device. To convert a stacked unit to VLT,
see Reconfiguring Stacked Switches as VLT.
● Data ports are configured as stacking ports in predefined groups of four 10G ports called stack-groups.
● When using the 40G ports, you can configure a single port as a stack port; each 40G port is a stack-group.
● All the ports in a stack-group are placed in stacking mode. Unused ports in that group cannot be used as data ports.
● Stacking on the device is accomplished through front-end user ports on the chassis.
● All stack units must have the same version of Dell EMC Networking OS.
Stacking Installation Tasks
The following are the stacking installation tasks.
● Create a Stack
● Add Units to an Existing Stack
● Split a Stack
Stacking
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