Dell MX9116n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 646
Con PFC, Optional Repeat Step 1
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Configure PFC Priority flow control (PFC) provides a pause mechanism based on the 802.1p priorities in ingress traffic. PFC prevents frame loss due to network congestion. Configure PFC lossless buffers, and enable pause frames for dot1p traffic on a per-interface basis. Repeat the PFC configuration on each PFC-enabled interface. PFC is disabled by default. Decide if you want to use the default dot1p-priority-to-traffic class mapping and the default traffic-class-to-queue mapping. See PFC configuration notes to change the default settings. Configuration steps: 1 Create PFC dot1p traffic classes. 2 Configure ingress buffers for PFC traffic. 3 Apply a service policy and enable PFC. 4 (Optional) Configure the PFC shared buffer for lossless traffic. Create PFC dot1p traffic classes 1 Create a network-qos class map to classify PFC traffic classes in CONFIGURATION mode (1 to 7). Specify the traffic classes using the match qos-group command. Qos-groups map 1:1 to traffic classes 1 to 7 (qos-group 1 corresponds to traffic class 1). Enter a single value, a hyphen-separated range, or multiple qos-group values separated by commas in CLASS-MAP mode. class-map type network-qos class-map-name match qos-group {1-7} exit 2 (Optional) Repeat Step 1 to configure additional PFC traffic-class class-maps. Configure pause and ingress buffers for PFC traffic See PFC configuration notes for the default ingress queue settings and the default dot1p priority-queue mapping. 1 Create a network-qos policy map in CONFIGURATION mode. policy-map type network-qos policy-map-name 2 Associate the policy-map with a network-qos class map in POLICY-MAP mode. class class-map-name 3 Configure default values for ingress buffers used for the network-qos class maps in POLICY-CLASS-MAP mode. pause (Optional) Change the default values for the ingress-buffer size reserved for the network-qos class-map traffic and the thresholds used to send XOFF and XON pause frames (in kilobytes). pause [buffer-size kilobytes {pause-threshold kilobytes | resume-threshold kilobytes}] 4 Enable the PFC pause function for dot1p traffic in POLICY-CLASS-MAP mode. The dot1p values must be the same as the qosgroup (traffic class) numbers in the class map in Step 2. Enter a single dot1p value (1-7), a hyphen-separated range, or multiple dot1p values separated by commas. pfc-cos dot1p-priority 5 (Optional) Repeat Steps 2-4 to configure PFC on additional traffic classes. Apply service policy and enable PFC 1 Apply the PFC service policy on an ingress interface or interface range in INTERFACE mode. interface ethernet node/slot/port:[subport] service-policy input type network-qos policy-map-name interface range ethernet node/slot/port:[subport]-node/slot/port[:subport] service-policy input type network-qos policy-map-name 646 Converged data center services