Dell PowerSwitch S5212F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 1335

Table 88. Default setting for LLFC (continued) Speed 10G 25G 40G 50G 100G Default dynamic shared buffer threshold (alpha 9KB 9KB 9KB 9KB 9KB value) NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each LLFC starts consuming shared buffers from the lossless pool with the alpha value determining the threshold except for the S4200-ON series platform. The following table lists the priority flow control (PFC) buffer settings per PFC priority group: Table 89. Default settings for PFC Speed Default reserved buffer for S4000, S4048-ON, S6010-ON 10G 25G 40G 50G 100G 9KB NA 9KB NA NA Default reserved buffer for S41xx, Z9100-ON 9KB 9KB 18KB 18KB 36KB Default Xoff threshold 36KB 45KB 75KB 91KB 142KB Default Xon threshold 9KB 9KB 9KB 9KB 9KB Default dynamic share buffer threshold (alpha value) 9KB 9KB 9KB 9KB 9KB NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each PFC starts consuming shared buffers from the lossless pool with the alpha value determining the threshold. You can override the default priority group settings when you enable LLFC or PFC. 1. Create a network-qos type class-map to match the traffic classes. For LLFC, match all the traffic classes from 0 to 7. For PFC, match the required traffic class. OS10(config)# class-map type network-qos example-cmap-in-buffer OS10 (config-cmap-nqos)# match qos-group 0-7 2. Create network-qos type policy-map to define the actions for traffic classes, such as a buffer configuration and threshold. OS10(config)# policy-map type network-qos example-pmap-in-buffer OS10(config-pmap-network-qos)# class example-cmap-in-buffer OS10 (config-pmap-c-nqos)# pause buffer-size 300 pause-threshold 200 resume-threshold 100 OS10 (config-pmap-c-nqos)# queue-limit thresh-mode dynamic 5 Configure egress buffer All port queues are allocated with reserved buffers. When the reserved buffers are consumed, each queue starts using the shared buffers from the default pool. The following table lists the values allocated for the default egress buffers on the S4100-ON series platform. These values may differ for different platforms and speeds. Use the show qos egress buffers command to view the default egress buffers on your switch. Table 90. Default egress buffers on the S4100-ON series platform Speed 10G 25G 40G Reserved buffers 1664 bytes for each queue of a port (default) 1664 bytes 1664 bytes 50G 1664 bytes 100G 1664 bytes The default dynamic shared buffer threshold is 8. Quality of service 1335