Configuring Data Center Bridging Features 831console(config-if)#switchport mode trunk5 Exit interface configuration mode for the range of interfaces.6 Enter interface configuration mode for the CNA-facing ports andconfigure the DCBx port role as auto-downstream. This step automaticallyenables PFC on the ports.console(config)#interface te1/0/1-3,te2/0/1-3console(config-if)#lldp dcbx port-role auto-downconsole(config-if#exit7 Enter Interface Configuration mode for the ports connect to an FCF onboth switches in the stack to configure the DCBx port role as auto-upstream.console(config)#interface te1/0/16-17,te2/0/16-17console(config-if)#lldp dcbx port-role auto-up8 Set the FIP snooping port mode asfcf to indicate that these ports areconnected to a Fibre Channel forwarder.console(config-if)#fip-snooping port-mode fcfconsole(config-if)#exit9 Optionally, use the FIP snooping show commands to verify theconfiguration, view FIP snooping sessions, and view information about theports that are connected to end nodes or FCFs.Enhanced Transmission SelectionNetworks classify and prioritize traffic to provide different servicecharacteristics to end user traffic flows. Administrators may wish to guaranteeor limit bandwidth for certain traffic, ensure lossless behavior for other traffic,and control the queue discipline/drop characteristics for best-effort traffic.Additionally, it is desirable for a switch to support sharing bandwidth amongbursty sources while still enabling prioritization of time-sensitive ormanagement traffic that requires minimum latency.Enhanced transmission selection (ETS) provides uniform management forsharing bandwidth between congestion managed and traditional classes on asingle bridged network. Using priority-based processing and weightallocations, Traffic Class Groups (TCGs) carrying different types of trafficsuch as LAN, SAN, and management traffic can be configured to provideminimum bandwidth guarantees, unused bandwidth sharing, and lossless or
