Reference Guide

S-Series Stacking Commands | 1443

S-Series Stacking Commands

Overview

All commands in this chapter are specific to the S-Series s, , and

platforms as indicated by the characters that appear under each of the command

headers.

The commands are always available and operational, whether or not 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 details on using the S-Series stacking feature, the chapter “Stacking S-Series

Switches” in the

FTOS Configuration Guide.

The Dell Force10 operating software (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. CLI commands for individual DCB features are as

follows:

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 40 Gig (QSPF+) ports.

• DCB is not supported over any of the 48 RJ-45 10 Gig ports while they are configured in stacking

mode.

• You cannot configure stacking on any of the 48 RJ-45 10 Gig ports, if DCB is enabled on any of

the 40 Gig stacking ports.

• If DCB is enabled, it will disable the ability to use any of the 48 10 Gig ports for stacking.

Caution: S4810 and S4820T Stacking cannot be enabled simultaneously with VLT. If both

are enabled at the same time, unexpected behavior will occur.