Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 980

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 tc 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 buffer OS10(config-pmap-network-qos)# class tc 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 reserved buffer per queue is 1664 bytes for the speed of 10G, 25G, 40G, 50G, and 100G. The default dynamic shared buffer threshold is 8. 1 Create a queuing type class-map to match the queue. OS10(config)# class-map type queuing q1 OS10(config-cmap-queuing)# match queue 1 2 Create a queuing type policy-map to define the actions for queues, such as a buffer configuration and threshold. OS10(config)# policy-map type queuing q-buffer OS10(config-pmap-queuing)# class q1 OS10(config-pmap-c-que)# queue-limit queue-len 200 thresh-mode dynamic 5 Deep Buffer mode NOTE: This feature is supported only on the S4200-ON series. OS10 provides the flexibility to configure the buffer mode based on your system requirements. The system memory contains a list of packet buffers and per packet information (PPI), which is used to enable statistics tagging, ingress shaping, PFC, and output logical interface stamping per multicast traffic. You can configure Deep Buffer mode to manage switch buffer availability. The following lists the total buffer availability in different modes: Table 67. Buffer availability in different modes Platform Without deep buffer S4200-ON series 4.63 GB With deep buffer 6.24 GB Deep Buffer mode takes effect only after saving it in the startup configuration and reloading the switch. NOTE: Disabling the Deep Buffer mode configuration during run-time is not supported. 980 Quality of service