Dell Force10 S4820T FTOS Command Reference Guide - Page 463

13 Data Center Bridging Overview Data center bridging (DCB) refers to a set of IEEE Ethernet enhancements that provide data centers with a single, robust, converged network to support multiple traffic types, including LAN, server, and storage traffic. DCB and Switch Stacking 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. 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: DCB Command • dcb-enable PFC Commands • clear pfc counters • dcb-input • dcb-policy input • dcb-policy input stack-unit stack-ports all • dcb stack-unit pfc-buffering pfc-port pfc-queues • description • pfc link-delay • pfc mode on • pfc priority Data Center Bridging | 463