NOTE: Dell Networking does not recommend mapping all ingress traffic to a single queue whenusing PFC and ETS. However, Dell Networking does recommend using Ingress traffic classificationusing the service-class dynamic dot1p command (honor dot1p) on all DCB-enabledinterfaces. If you use L2 class maps to map dot1p priority traffic to egress queues, take into accountthe default dot1p-queue assignments in the following table and the maximum number of twolossless queues supported on a port (refer to Configuring Lossless Queues).Although Dell Networking OS allows you to change the default dot1p priority-queue assignments(refer to Setting dot1p Priorities for Incoming Traffic), DCB policies applied to an interface maybecome invalid if you reconfigure dot1p-queue mapping. If the configured DCB policy remainsvalid, the change in the dot1p-queue assignment is allowed.Configuring the Dynamic Buffer MethodPriority-based flow control using dynamic buffer spaces is supported on the switch.To configure the dynamic buffer capability, perform the following steps:1. Enable the DCB application. By default, DCB is enabled and link-level flow control is disabled on allinterfaces.CONFIGURATION modedcb enable2. Configure the shared PFC buffer size and the total buffer size. A maximum of 4 lossless queues aresupported.CONFIGURATION modedcb pfc-shared-buffer-size 4000dcb pfc-total-buffer-size 50003. Configure the number of PFC queues.CONFIGURATION modedcb enable pfc-queues pfc-queuesThe number of ports supported based on lossless queues configured depends on the buffer. Thedefault number of PFC queues in the system is two for S4810 and Z9500, and one for S6000platforms.For each priority, you can specify the shared buffer threshold limit, the ingress buffer size, buffer limitfor pausing the acceptance of packets, and the buffer offset limit for resuming the acceptance ofreceived packets.4. Configure the profile name for the DCB buffer thresholdCONFIGURATION modedcb-buffer-threshold dcb-buffer-threshold5. DCB-BUFFER-THRESHOLD modepriority 0 buffer-size 52 pause-threshold 16 resume-offset 10 shared-threshold-weight 76. Assign the DCB policy to the DCB buffer threshold profile.282 Data Center Bridging (DCB)
