Dell Force10 S4820T FTOS Command Reference Guide - Page 1443

50 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. Caution: S4810 and S4820T Stacking cannot be enabled simultaneously with VLT. If both are enabled at the same time, unexpected behavior will occur. 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. S-Series Stacking Commands | 1443