Reference Guide

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Stacking
All commands in this chapter are specific to the Dell Networking operating software (FTOS) on the S4820T platform.
The commands are always available and operational, whether the S-Series has a stacking module inserted. You can use
the commands to pre-configure a switch, so that the configuration settings are invoked when the switch is attached to
other S-Series units.
For information about using the S-Series stacking feature, refer to the “Stacking S-Series Switches” chapter in the FTOS
Configuration Guide .
CAUTION: You cannot enable S4820T stacking simultaneously with virtual link trunking (VLT). If you enable both at
the same time, unexpected behavior occurs.
The FTOS commands for data center bridging features include 802.1Qbb priority-based flow control (PFC), 802.1Qaz
enhanced transmission selection (ETS), and the data center bridging exchange (DCBX) protocol.
Switch Stacking an DCB Caveats for the S4820T
The following is a list of behaviors and limitations regarding the use of DCB over S4820T ports involved in switch
stacking:
• You can enable DCB only on 40Gig (QSPF+) ports.
• DCB is not supported over any of the 48 RJ-45 10Gig ports while they are configured in Stacking mode.
• You cannot configure stacking on any of the 48 RJ-45 10Gig ports if you enable DCB on any of the 40Gig stacking
ports.
• If you enable DCB, it disables the ability to use any of the 48 10Gig ports for stacking.
redundancy disable-auto-reboot
Prevent the S-Series stack management unit, stack member unit, and standby unit from rebooting if they fail.
S4820T
Syntax
redundancy disable-auto-reboot [stack-unit] [members | 0-11]
To return to the default, use the no redundancy disable-auto-reboot stack-
unit command.
Parameters
stack-unit Enter the stack-unit number. For the S4820T, the range is from 0 to 11.
members This is all stack-units.
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