Users 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 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.
• 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 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 configuration 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.
Stack Group/Port Numbers
By 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 are divided into
18 stack groups, each with 40G of bandwidth. Stack groups 0 through 11 correspond to 10G stack groups with four ports each. Stack
groups 12 to 17 are one 40G port each.
The front end ports accommodate QSFP+.
• Ports are divided into 18 stack-groups (0 to 17) 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 1-4, stack-group 1 corresponds to ports 5-8, so on through stack-group 11.
○ stack-group 12 corresponds to the 40G port 49, stack-group 13 corresponds to port 50, so on through stack group 17.
Stacking
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