Concept Guide
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 congurations to be pushed to a newly joined the S4048T-
ON switch. If the newly joined member unit is a S4048-ON switch, then the congurations are not pushed to the switch.
NOTE: Similarlly, the TDR feature is available only, when the S4048T acts a master. The TDR specic 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 congurations to be pushed to a newly joined S4048T-ON switch. If the newly joined member unit is a S4048-ON switch,
then the congurations 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
Reconguring Stacked Switches as VLT.
• Data ports are congured as stacking ports in predened groups of four 10G ports called stack-groups.
• When using the 40G ports, you can congure 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
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 10G ports of two units or 40G ports of
two units. The stack links between the two units are grouped into a single LAG.
Stacking
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