Service Manual

• You cannot enable stacking and virtual link trunking (VLT) simultaneously on the device. To convert a stacked unit to VLT, refer to
Reconguring Stacked Switches as VLT.
• Data ports are congured as stacking ports in predened groups of four 1G ports called stack-groups.
• 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.
S-Series Stacking Installation Tasks
The following are the S-Series stacking installation tasks.
• Create an S-Series Stack
• Add Units to an Existing S-Series Stack
• Split an S-Series Stack
Create an S-Series Stack
Stacking is enabled on the device using the front end ports.
No conguration is allowed on front end ports used for stacking. Stacking can be made between 1G ports of two units or 10G 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 two 10G stack links can be made between two units in a stack. There are four stack group. Each 10G port is a stack
group.
The front end ports accommodate 1G Ethernet, 10G SFP and SFP+.
You can connect the units while they are powered down or up. Stacking ports are bi-directional.
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.
Syslog messages are generated by the management unit:
• the syslog includes the unit number, previous version, and version being downloaded.
• when the rmware synchronization is complete.
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.
NOTE: Any scripts used to streamline the stacking conguration process must be updated to reect the Command Mode
change from EXEC to CONFIGURATION to allow the scripts to work correctly.
Enabling Front End Port Stacking
To enable the front ports on an S3048–ON unit for stacking, use the following commands.
NOTE: You can stack a maximum of two 10G stack ports.
NOTE: After a port is allocated for stacking, you can only use it for stacking. If stack-group 1 is allocated for stacking,
you can use ports 1, 2, 3, and 4 for stacking but not for Ethernet anymore. If only port 1 is used for stacking, ports 2, 3,
and 4 are spare; they cannot be used for Ethernet.
1. Assign a stack group for each unit.
CONFIGURATION mode
stack-unit id stack-group id
732
Stacking